CN105152393A - Laboratory simulation device for groundwater pollution remediation and usage method of laboratory simulation device - Google Patents
Laboratory simulation device for groundwater pollution remediation and usage method of laboratory simulation device Download PDFInfo
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- CN105152393A CN105152393A CN201510510956.0A CN201510510956A CN105152393A CN 105152393 A CN105152393 A CN 105152393A CN 201510510956 A CN201510510956 A CN 201510510956A CN 105152393 A CN105152393 A CN 105152393A
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Abstract
An embodiment of the invention provides a laboratory simulation device for groundwater pollution remediation and a usage method of the laboratory simulation device. The device comprises a simulation aquifer unit, a water pumping and distributing unit, a remediation unit, an air stripping unit and a monitoring unit, wherein water is delivered to a simulation aquifer through a first peristaltic pump by a water storage barrel; a water pumping well and a water pumping pipe are communicated with the simulation aquifer and the outside, a sieve pipe is located below the water level of the simulation aquifer, and a water intake port of the water pumping pipe is located at the lower part of the sieve pipe; a second peristaltic pump is communicated with the water pumping pipe and a water guide pipe, and the other end of the water guide pipe is connected with a T-shaped water distributing pipe; the bottom of a seepage zone is communicated with the simulation aquifer; a water flow flows in filler layers of the seepage zone and a reaction zone in an S shape; multiple air guide pipes capable of being closed are distributed in an overlaying soil layer; an aeration fan is connected with one end of an air delivery pipe, and the other end of the air delivery pipe extends below the water level of a water layer of the water pumping well; multiple air pumping wells are communicated with the simulation aquifer and the outside and connected with an air pump; the monitoring unit comprises multiple sampling pipes which are located at the simulation aquifer, the reaction zone and the seepage zone respectively.
Description
Technical field
The present invention relates to field of underground water pollution repair in environmental protection, particularly relate to a kind of laboratory simulation device for groundwater pollution reparation and using method thereof.
Background technology
Underground water is the precious resources that the mankind depend on for existence, since entering industrialization society, as the underground water of important town and country resource of water supply, due to the impact of mankind's activity, a large amount of pollutent enters groundwater environment, makes underground water inevitably receive pollution, and aggravates year by year.Because the seriousness of groundwater pollution, people drop into a large amount of manpower and materials and study polluted underground water recovery technique.Studying pollutants transfer process further by the experimental installation building simulate formation water surrounding and solve the foreword problems such as recovery technique effectiveness, is one of important means of this type of problem in science of research.
Current Remedy Technology of Contaminated Groundwater mainly contains permeable coefficient tensor, multistage strengthening groundwater remediation technology, soil vapor extraction technology and pump-and-treat technology etc., but often a kind of practical application of technology is based upon on a series of scientific research bases such as laboratory study.Therefore, the important means that researcher studies this type of problem in science is by building underground water experimental simulation device, Study of The Underground water pollutions repairing effect and repair mechanisms, and develops further and optimize every technology.Therefore that build design science, that easy-operating, economic utility is high groundwater pollution process simulation and prosthetic device become the hot issue be engaged in laboratory that groundwater remediation studies and paid close attention to.
Present stage laboratory simulation experiment adopts column experiments and groove experiment to simulate the motion of Polluted Groundwater in waterbearing stratum, and analyzes the removal usefulness of pollutent.But the birth defect due to column experiments is can only the one dimension distribution situation of simulating pollution thing, cannot the distributed in three dimensions feature of simulating pollution thing, there is very large gap in the groundwater remediation environment that column experiments is simulated and actual environment, is difficult to deep announcement pollutent repair mechanisms.Compared to column experiments, groove experiment, as the laboratory simulation important device of Remedy Technology of Contaminated Groundwater, with regard to energy well simulated groundwater three-dimensional feature, and analyzes the three dimensional change trend of the contaminant degradation in repair process.Same, existing groove experiment often can only simulate separately a kind of recovery technique, when simulating another kind of recovery technique, need again to lay every remanufactured component, even to redesign filled with medium material etc., virtually increase workload and the job costs of researcher, reduce working efficiency.Therefore develop one and can be used for the research of groundwater remediation technology mechanism, can improve again scientific effort efficiency, increase the polyfunctional lab setup of simulator, what become groundwater pollution simulation research pays close attention to object.
Summary of the invention
For prior art Problems existing, the embodiment of the present application provides a kind of laboratory simulation device for groundwater pollution reparation and using method thereof, can by the laboratory simulation device of multistage strengthening groundwater remediation technology and soil vapor extraction technology Remedy Technology of Contaminated Groundwater combined running, reduce the gap between Polluted Groundwater reparative experiment room simulated environment and actual environment, true reflection groundwater pollution repairs situation, for the engineer applied of multistage strengthening groundwater remediation technology and soil vapor extraction technology Remedy Technology of Contaminated Groundwater provides objective theoretical foundation.
The embodiment of the present application provides a kind of laboratory simulation device repaired for groundwater pollution, it comprises: simulation waterbearing stratum unit, described simulation waterbearing stratum unit comprise water storage barrel, the first peristaltic pump and simulation waterbearing stratum, by described first peristaltic pump by described water storage barrel to described simulation waterbearing stratum water delivery; Take out water distribution unit, described in take out water distribution unit and comprise pumped well, drinking-water pipe, the second peristaltic pump, aqueduct and T-shaped water distributor; Described pumped well and position drinking-water pipe is in the inner communicated with described simulation waterbearing stratum and outside, and the screen casing bottom described pumped well is positioned at below described simulation waterbearing stratum water level, and the intake of described drinking-water pipe is positioned at described screen casing bottom; Described second peristaltic pump one end is communicated with the top of described drinking-water pipe, and the other end is communicated with aqueduct, the other end end vertical connecting T-shaped water distributor of described aqueduct, and described T-shaped water distributor distributes multiple micropore; Repair unit, described reparation unit comprises by the vadose region of the separated bottom of waterproof ventilated membrane, the overburden layer at top and reaction zone therebetween; Described vadose region is positioned at described pumped well periphery and communicates with described simulation waterbearing stratum bottom it; Current are in the S-type flowing of described vadose region packing layer; Current are in the S-type flowing of described reaction zone packing layer; In described overburden layer, vertical runs many can close airway, and the described airway that closes is communicated with described reaction zone and outside; Air stripping unit, described air stripping unit comprises Aeration fan, pressure regulator valve, induction pipe, vacuum fan and extraction well, described Aeration fan is connected by described pressure regulator valve one end with described induction pipe, and the other end of described induction pipe stretches to below the water layer water level of described pumped well; Multiple through described reaction zone of described extraction well being positioned at described pumped well downstream is with overburden layer and be communicated with described simulation waterbearing stratum and outside, and described extraction well is connected with vacuum fan.
Preferably, the laboratory simulation device for groundwater pollution reparation also comprises: monitoring means, and described monitoring means comprises multiple sampling tube, lays respectively at described simulation waterbearing stratum, reaction zone and vadose region.
Preferably, described simulation waterbearing stratum unit also comprises adjustable overflow weir, and described adjustable overflow weir is positioned at top, described simulation waterbearing stratum, and the water level that described adjustable overflow weir is used for described simulation waterbearing stratum remains on specified altitude assignment.
Preferably, described in take out water distribution unit and also comprise filtering net, described filtering net is positioned at described pumped well screen casing place and described drinking-water pipe intake place.
Preferably, described aqueduct is positioned at described reparation unit, and in described aqueduct, flow direction is parallel to described simulation waterbearing stratum flow direction.
Preferably, lay multiple dividing plate perpendicular to described pumped well in the packing layer of described vadose region and form arc aquaporin excessively, current are S-type flowing in the vertical direction.
Preferably, fill and be used for the medium filler of absorption degradation in described reaction zone, at least two divider upright are in described aqueduct and be interspersed in described reaction zone, and current are by the S-type flowing of described dividing plate.
Accordingly, the invention provides a kind of using method of the laboratory simulation device for groundwater pollution reparation, when never running state conversion is to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state for above-mentioned arbitrary described laboratory simulation device for groundwater pollution reparation, comprise following use step: (1) starts described first peristaltic pump and keeps running status, then start described Aeration fan, vacuum fan, the second peristaltic pump keep running status successively; (2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize; (3) described Aeration fan sucks air, after described pressure regulating device, is delivered to described simulation waterbearing stratum by described induction pipe, air and the abundant making contact of sewage, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase; (4) in described simulation waterbearing stratum, the air of part containing volatile contaminant detaches to earth's surface by described vacuum fan by extraction well, by the process of gas recovery treatment unit; Part enters described reaction zone containing the air of volatile contaminant by described waterproof ventilated membrane, and by the packing layer adsorption treatment of described reaction zone and overburden layer; (5) sewage in described simulation waterbearing stratum is pumped into described drinking-water pipe by the screen casing of described pumped well by described second peristaltic pump, after be delivered to described aqueduct, be uniformly distributed in described reaction zone after flowing to described T-shaped water distributor; (6) pollutent in described reaction zone in sewage is by the packing layer adsorption treatment of described reaction zone and overburden layer, and the water purification stream seepage flow after process is back to described vadose region, and flows back into described simulation waterbearing stratum, forms water cycle.
Preferably, when never running state conversion is to multistage strengthening groundwater remediation technology isolated operation state for device, comprise following use step: (1) closes described Aeration fan, vacuum fan, start described first peristaltic pump, the second peristaltic pump keep running status; (2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize; (3) sewage in described simulation waterbearing stratum is pumped into described drinking-water pipe by the screen casing of described pumped well by described second peristaltic pump, after be delivered to described aqueduct, be uniformly distributed in described reaction zone after flowing to described T-shaped water distributor; (4) pollutent in described reaction zone in sewage is by the packing layer adsorption treatment of described reaction zone and overburden layer, and the water purification stream seepage flow after process is back to described vadose region, and flows back into described simulation waterbearing stratum, forms water cycle.
Preferably, when never running state conversion is to soil vapor extraction technology isolated operation state for device, comprise following use step: (1) closes described second peristaltic pump, start described first peristaltic pump and keep running status, then starting described Aeration fan, vacuum fan keep running status successively; (2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize; (3) described Aeration fan sucks air, after described pressure regulating device, is delivered to described simulation waterbearing stratum by described induction pipe, air and the abundant making contact of sewage, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase; (4) in described simulation waterbearing stratum, the air of part containing volatile contaminant detaches to earth's surface by described vacuum fan by extraction well, by the process of gas recovery treatment unit; Part enters described reaction zone containing the air of volatile contaminant by described waterproof ventilated membrane, and by the packing layer adsorption treatment of described reaction zone and overburden layer.
A kind of laboratory simulation device for groundwater pollution reparation provided according to the embodiment of the present application and using method thereof, this device can be used for the laboratory simulation experiment that multistage strengthening groundwater remediation technology repairs underground water, also can be used for the laboratory simulation experiment that soil vapor extraction technology repairs underground water, between the two can easy, switch flexibly, and do not need again to load, therefore, process and the effect of simulated experiment is not substantially affected.In addition, organically by the two connected applications laboratory simulation experiment, the scope of application of device can be extended, improves the functional of single device; This device extraction well is dual-purpose well, uses, for the extraction of volatile contaminant in soil vapor extraction technological system in multistage strengthening groundwater remediation technological system as the screen casing of simulation waterbearing stratum sampling tube.Simultaneously it runs through whole reparation unit, sample path and pumping path are reduced to the shortest while, simulation waterbearing stratum ambient interference is also reduced to minimum; This device reaction district high-strength waterproof air-permeable envelope and other regions separate, and prevent polluted underground water seepage simulation waterbearing stratum, reaction zone, but allow passing through of the volatile contaminant in simulation waterbearing stratum; This unit simulation waterbearing stratum Inlet and outlet water all adopts the adjustable overflow weir of porous sieve plate, accuracy controlling simulation waterbearing stratum elevation of water surface while water distribution uniformity, charge for remittance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Accompanying drawing described herein is used to provide further understanding of the present application, and form a application's part, the schematic description and description of the application, for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the structural representation of the laboratory simulation device that one embodiment of the present of invention are repaired for groundwater pollution;
Fig. 2 is the A-A diagrammatic cross-section of the laboratory simulation device that one embodiment of the present of invention are repaired for groundwater pollution.
Reference numeral:
1: the first peristaltic pump; 2: the second peristaltic pumps; 3: simulation waterbearing stratum overflow port; 4: simulation waterbearing stratum water-in; 5: simulation waterbearing stratum water outlet; 6: vadose region dividing plate; 7: vadose region; 8: reaction zone; 9: overburden layer; 10: pumped well; 11: drinking-water pipe; 12: induction pipe; 13: aqueduct; 14: reaction zone sampling tube; 15: can airway be closed; 16: simulation waterbearing stratum sampling tube; 17: extraction well; 18: reaction zone dividing plate; 19:T type water distributor; 20: simulation waterbearing stratum; 21: Aeration fan; 22: pressure regulating device; 23: vacuum fan.
Embodiment
For making the object of the embodiment of the present application, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
The main thought of the embodiment of the present application is, according to the technical scheme of the embodiment of the present application, by cooperation and the switching of all parts in device, may be used for multistage strengthening groundwater remediation technology and be used alone the laboratory simulation experiment of repairing underground water, also can be used for soil vapor extraction technology and be used alone the laboratory simulation experiment of repairing underground water, the laboratory simulation experiment of multistage strengthening groundwater remediation technology and soil vapor extraction technical combinations use reparation underground water can also be used for; Unused state, two kinds of technology of device are used alone between state, two kinds of technical tie-ups uses and can switch flexibly, and the scope of application of expanding unit, improves the functional and treatment effect of single device.
For making the object of the application, technical scheme and advantage clearly, below in conjunction with drawings and the specific embodiments, the application is described in further detail.
Fig. 1 is the structural representation of the laboratory simulation device that one embodiment of the present of invention are repaired for groundwater pollution.Fig. 2 is the A-A diagrammatic cross-section of the laboratory simulation device that one embodiment of the present of invention are repaired for groundwater pollution.As depicted in figs. 1 and 2:
Laboratory simulation device for groundwater pollution reparation comprises: simulate waterbearing stratum unit, take out water distribution unit, repair unit, air stripping unit and monitoring means.
Simulation waterbearing stratum unit comprises water storage barrel, the first peristaltic pump 1 and simulation waterbearing stratum 20, and in water storage barrel, splendid attire is simulate the underground water polluted, and water storage barrel is connected with simulation waterbearing stratum water-in 4 by silicone tube; First peristaltic pump 1 can realize the quantitative water delivery of water storage barrel to simulation waterbearing stratum 20.
Preferably, simulation waterbearing stratum unit also comprises adjustable overflow weir, and adjustable overflow weir is positioned at the top in simulation waterbearing stratum 20, and adjustable overflow weir remains on specified altitude assignment for the water level of simulating waterbearing stratum 20.
Preferably, simulation waterbearing stratum 20 is provided with simulation waterbearing stratum overflow port 3, simulation waterbearing stratum water-in 4 and simulation waterbearing stratum water outlet 5, and simulation waterbearing stratum 20 selects 2 ~ 6mm sand grains to simulate waterbearing stratum.
Take out water distribution unit and comprise pumped well 10, drinking-water pipe 11, second peristaltic pump 2, aqueduct 13 and T-shaped water distributor 19; Drinking-water pipe 11 and induction pipe 12 are positioned at pumped well 10, and pumped well 10 is communicated with simulation waterbearing stratum 20 and outside with drinking-water pipe 11, preferably, the caliber of pumped well 10 is 40 ~ 60mm, and pipe range is 600 ~ 700mm.Screen casing bottom pumped well 10 is positioned at below simulation waterbearing stratum 20 water level, and the intake of drinking-water pipe 11 is positioned at the middle portion on the lower of screen casing; Preferably, the pipe range of screen casing is 150 ~ 200mm, and screen casing is positioned at below simulation waterbearing stratum 20 water level 50 ~ 100mm.
Second peristaltic pump 2 is positioned at the top of repairing unit, second peristaltic pump 2 is for the quantitative extraction of underground water, second peristaltic pump 2 one end is communicated with the top of drinking-water pipe 11, the other end is communicated with aqueduct 13, aqueduct 13 is positioned at overburden layer 9, the other end end vertical connecting T-shaped water distributor 19 of aqueduct 13, T-shaped water distributor 19 is placed in one end away from drinking-water pipe 11, reaction zone 8, and T-shaped water distributor 19 distributes multiple micropore.
Preferably, the caliber of drinking-water pipe 11 is 6 ~ 10mm.Preferably, aqueduct 13 is positioned at repairs unit, and in aqueduct 13, flow direction is parallel to simulation waterbearing stratum 20 flow direction.Preferably, the caliber of aqueduct 13 is 10 ~ 20mm, and pipe range is 500 ~ 600mm.Preferably, the caliber of T-shaped water distributor 19 is 10 ~ 20mm, and the aperture of the micropore on T-shaped water distributor 19 is 1 ~ 3mm.
Preferably, take out water distribution unit and also comprise filtering net, filtering net is positioned at screen casing place and the drinking-water pipe 11 intake place of pumped well 10.
Repair unit and comprise the vadose region 7 of bottom, the overburden layer 9 at top and reaction zone 8 therebetween.
Separated by waterproof ventilated membrane between the vadose region 7 of bottom, the overburden layer 9 at top and reaction zone 8, adopt the employing tetrafluoroethylene material of tetrafluoroethylene material, the bottom of vadose region 7 communicates with simulation waterbearing stratum 20.
It is peripheral that vadose region 7 is positioned at pumped well 10 well casing; Preferably, the filling filler of vadose region 7 is quartz sand or the haydite of 3 ~ 5mm, and the filling scope of vadose region 7 comprises outside radiation radius 80 ~ 160mm centered by pumped well 10.
Current are S-type flowing in the vertical direction of vadose region 7 packing layer; Preferably, lay multiple vadose region dividing plate 6 perpendicular to pumped well 10 in the packing layer of vadose region 7 and form arc aquaporin excessively, current are S-type flowing in the vertical direction.
Preferably, fill the medium filler being used for absorption degradation in reaction zone 8, respective media filler can be selected according to pollutent, such as zeolite or Zero-valent Iron.In reaction zone 8, lay at least two reaction zones dividing plate 18, and be interspersed in reaction zone 8 perpendicular to aqueduct 13, usually, be staggered in area place, reaction zone dividing plate 18 side 1/4, current are in the S-type flowing of horizontal direction of reaction zone 8 packing layer.Preferably, through hole is uniformly distributed on reaction zone dividing plate 18, and the aperture of through hole is 15 ~ 25mm, and pitch of holes is 5 ~ 10mm.
Overburden layer 9 is positioned at above reaction zone 8.Preferably, overburden layer 9 comprises soil and gac mixes, and usually, the volume ratio of soil and gac is 4:1, and the thickness of overburden layer 9 is 100 ~ 200mm.The plant can planted above overburden layer 9 is adsorbable degraded or enrichment pollutent also, and adsorbable part enters the volatile contaminant of overburden layer 9 by waterproof ventilated membrane.
In overburden layer 9, vertical runs many can close airway 15, airway 15 can be closed and be communicated with reaction zone 8 and outside, can close in insertion reaction district, airway 15 bottom 8, repair characteristic according to pollutent, open or close and can close airway 15, increase or reduce oxygen content level in reaction zone 8.
Air stripping unit Aeration fan 21, pressure regulator valve 22, induction pipe 12, vacuum fan 23 and extraction well 17.Aeration fan 21 is connected by pressure regulator valve 22 one end with induction pipe 12, and the other end of induction pipe 12 stretches to below the water layer water level of pumped well 10; Preferably, the top of pumped well 10 is connected with gas recovery treatment unit, is convenient to, to the collection and treatment of tail gas, avoid secondary pollution.
The multiple through reaction zone 8 of extraction well 17 and overburden layer 9 being positioned at pumped well 10 downstream, and be communicated with simulation waterbearing stratum 20 and outside, extraction well 17 is connected with vacuum fan 23.Preferably, extraction well 17 is positioned at the downstream of pumped well 10, and extraction well 17 is arranged in array along water (flow) direction.Extraction well 17 lays 1 ~ 2 row along Groundwater Flow direction, 3 ~ 5 rows, and extraction well 17 passes perpendicularly through reaction zone 8 and overburden layer 9, and in overburden layer 9 exposure, plays the effect accelerating volatile contaminant to be delivered to earth's surface.
Preferably, the laboratory simulation device for groundwater pollution reparation also comprises monitoring means, and monitoring means comprises multiple sampling tube, lays respectively at simulation waterbearing stratum 20, reaction zone 8 and vadose region 7.Preferably, be provided with simulation waterbearing stratum sampling tube 16 in simulation waterbearing stratum 20, simulation waterbearing stratum sampling tube 16 is positioned at extraction well 17.Preferably, reaction zone 8 base plate vertically plugs many reaction zone sampling tubes 14, reaction zone sampling tube 14 is laid in T-shaped water distributor 19 downstream, and lays along reaction zone 8 current S type flow circuits.Preferably, be provided with the sampling tube that many are parallel to pumped well 10 in vadose region 7, lay sampling tube by the degree of depth of vadose region dividing plate 6, the water-in of at least one sampling tube is positioned at the intersection in vadose region 7 and simulation waterbearing stratum 20.
Introduce the using method being used for the laboratory simulation device that groundwater pollution is repaired below further, the laboratory simulation device for groundwater pollution reparation comprises following three kinds of using states: multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state, multistage strengthening groundwater remediation technology isolated operation state and and soil vapor extraction technology isolated operation state.
When device is in multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state, may never running status or multistage strengthening groundwater remediation technology isolated operation state or soil vapor extraction technology isolated operation State Transferring to above-mentioned state.
First, introduce device and be in the never running state conversion working method to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state:
Step 1: start the first peristaltic pump 1 and keep running status, then start Aeration fan 21, vacuum fan 23, second peristaltic pump 2 keep running status successively.
Step 2: have preprepared simulated groundwater in water storage barrel, water storage barrel is connected with simulation waterbearing stratum water-in 4 by silicone tube by the first peristaltic pump 1, quantitatively carry sewage by water storage barrel to simulation waterbearing stratum 20 by the first peristaltic pump 1, keep the flow rate of water flow in simulation waterbearing stratum 20 to stablize.
Step 3: Aeration fan 21 is connected with one end of induction pipe 12 by pressure regulating device 22, the other end of induction pipe 12 gos deep into pumped well 10, the process of pumped well 10 top is connected with gas recovery treatment unit, Aeration fan 21 sucks air, after pressure regulating device 22, simulation waterbearing stratum 20 is delivered to the form of micro-bubble by induction pipe 12, air and the abundant making contact of sewage, gas dissolved water is fully contacted with underground water, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase.
Step 4: in simulation waterbearing stratum 20, the air of major part containing volatile contaminant detaches to earth's surface by vacuum fan 23 by extraction well 17, by the process of gas recovery treatment unit; The air that small portion contains volatile contaminant enters reaction zone 8 by waterproof ventilated membrane, and by the packing layer adsorption treatment of reaction zone 8 and overburden layer 9; In simulation downstream, waterbearing stratum 20, vacuum fan 23 constantly will be simulated waterbearing stratum 20 air by extraction well 17 and be extracted out, volatile contaminant is moved to downstream extraction well 17 fast, and enters the process of gas recovery treatment unit through extraction well 17, reach the object removing volatile contaminant.
Step 5: the well depth of pumped well 10 is to simulation waterbearing stratum 20, and be provided with drinking-water pipe 11 in this pumped well 10, drinking-water pipe 11 intake is positioned at screen casing mid-way; Second peristaltic pump 2 by simulation waterbearing stratum 20 sewage be pumped into drinking-water pipe 11 by the screen casing of pumped well 10, after be delivered to aqueduct 13, be uniformly distributed in reaction zone 8 after flowing to T-shaped water distributor 19.
Step 6: the pollutent in reaction zone 8 in sewage is by the packing layer adsorption treatment of reaction zone 8 and overburden layer 9, and the water purification stream seepage flow after process is back to vadose region 7, and flow back into simulation waterbearing stratum 20, form water cycle.Meanwhile, simulation waterbearing stratum 20 has certain flow rate, and after front a collection of polluted underground water is extracted out, the polluted underground water of upstream supplements in time, can realize the lasting removal of underground water pollutant, ensures the steady running of simulation test device.
Secondly, introduce device and be in working method from multistage strengthening groundwater remediation technology isolated operation State Transferring to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state:
Step 1: close Aeration fan 21, vacuum fan 23, start the first peristaltic pump 1, second peristaltic pump 2 and keep running status.
Step 2: have preprepared simulated groundwater in water storage barrel, water storage barrel is connected with simulation waterbearing stratum water-in 4 by silicone tube by the first peristaltic pump 1, quantitatively carry sewage by water storage barrel to simulation waterbearing stratum 20 by the first peristaltic pump 1, keep the flow rate of water flow in simulation waterbearing stratum 20 to stablize.
Step 3: the well depth of pumped well 10 is to simulation waterbearing stratum 20, and be provided with drinking-water pipe 11 in this pumped well 10, drinking-water pipe 11 intake is positioned at screen casing mid-way; Second peristaltic pump 2 by simulation waterbearing stratum 20 sewage be pumped into drinking-water pipe 11 by the screen casing of pumped well 10, after be delivered to aqueduct 13, be uniformly distributed in reaction zone 8 after flowing to T-shaped water distributor 19.
Step 4: the pollutent in reaction zone 8 in sewage is by the packing layer adsorption treatment of reaction zone 8 and overburden layer 9, and the water purification stream seepage flow after process is back to vadose region 7, and flow back into simulation waterbearing stratum 20, form water cycle.Meanwhile, simulation waterbearing stratum 20 has certain flow rate, and after front a collection of polluted underground water is extracted out, the polluted underground water of upstream supplements in time, can realize the lasting removal of underground water pollutant, ensures the steady running of simulation test device.
Then, introduce device and be in working method from soil vapor extraction technology isolated operation State Transferring to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state:
Step 1: close the second peristaltic pump 2, starts the first peristaltic pump 1 and keeps running status, then starts Aeration fan 21, vacuum fan 23 keep running status successively.
Step 2: have preprepared simulated groundwater in water storage barrel, water storage barrel is connected with simulation waterbearing stratum water-in 4 by silicone tube by the first peristaltic pump 1, quantitatively carry sewage by water storage barrel to simulation waterbearing stratum 20 by the first peristaltic pump 1, keep the flow rate of water flow in simulation waterbearing stratum 20 to stablize.
Step 3: Aeration fan 21 is connected with one end of induction pipe 12 by pressure regulating device 22, the other end of induction pipe 12 gos deep into pumped well 10, the process of pumped well 10 top is connected with gas recovery treatment unit, Aeration fan 21 sucks air, after pressure regulating device 22, simulation waterbearing stratum 20 is delivered to the form of micro-bubble by induction pipe 12, air and the abundant making contact of sewage, gas dissolved water is fully contacted with underground water, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase.
Step 4: in simulation waterbearing stratum 20, the air of major part containing volatile contaminant detaches to earth's surface by vacuum fan 23 by extraction well 17, by the process of gas recovery treatment unit; The air that small portion contains volatile contaminant enters reaction zone 8 by waterproof ventilated membrane, and by the packing layer adsorption treatment of reaction zone 8 and overburden layer 9; In simulation downstream, waterbearing stratum 20, vacuum fan 23 constantly will be simulated waterbearing stratum 20 air by extraction well 17 and be extracted out, volatile contaminant is moved to downstream extraction well 17 fast, and enters the process of gas recovery treatment unit through extraction well 17, reach the object removing volatile contaminant.
When device is in multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state, may from multistage strengthening groundwater remediation technology isolated operation state or soil vapor extraction technology isolated operation State Transferring to above-mentioned state.
First, introduce device and be in working method from multistage strengthening groundwater remediation technology isolated operation State Transferring to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state:
The method and never running state conversion to the difference of the working method of multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state are: the method step 1 is for startup first peristaltic pump 1, second peristaltic pump 2 and keep running status, start Aeration fan 21, vacuum fan 23 keep running status successively again, other steps are identical, no longer repeat at this.
Secondly, introduce device and be in working method from soil vapor extraction technology isolated operation State Transferring to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state:
The method and never running state conversion to the difference of the working method of multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state are: the method step 1 is startup first peristaltic pump 1, Aeration fan 21, vacuum fan 23 keep running status, restart the second peristaltic pump 2 and keep running status, other steps are identical, no longer repeat at this.
When device is in multistage strengthening groundwater remediation technology isolated operation state, may from soil vapor extraction technology isolated operation state or multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running State Transferring to above-mentioned state.
First, introduce device and be in working method from soil vapor extraction technology isolated operation State Transferring to multistage strengthening groundwater remediation technology isolated operation state:
The method and never running state conversion to the difference of the working method of multistage strengthening groundwater remediation technology isolated operation state are: the method step 1 is startup first peristaltic pump 1 and keeps running status, close Aeration fan 21, vacuum fan 23 successively, after the stable level of simulation waterbearing stratum 20, restart the second peristaltic pump 2 and keep running status, other steps are identical, no longer repeat at this.
Secondly, introduce device and be in from multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running State Transferring to the working method of multistage strengthening groundwater remediation technology isolated operation state:
The method and never running state conversion to the difference of the working method of multistage strengthening groundwater remediation technology isolated operation state are: the method step 1 is startup first peristaltic pump 1, second peristaltic pump 2 and keeps running status, close Aeration fan 21, vacuum fan 23 successively, other steps are identical, no longer repeat at this.
When device is in soil vapor extraction technology isolated operation state, may from multistage strengthening groundwater remediation technology isolated operation state or multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running State Transferring to above-mentioned state.
First, introduce device and be in working method from multistage strengthening groundwater remediation technology isolated operation State Transferring to soil vapor extraction technology isolated operation state:
The method and never running state conversion to the difference of the working method of soil vapor extraction technology isolated operation state are: the method step 1 is startup first peristaltic pump 1 and keeps running status, close the second peristaltic pump 2, after the stable level of simulation waterbearing stratum 20, start Aeration fan 21, vacuum fan 23 keep running status successively again, other steps are identical, no longer repeat at this.
Secondly, introduce device and be in from multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running State Transferring to the working method of soil vapor extraction technology isolated operation state:
The method and never running state conversion to the difference of the working method of soil vapor extraction technology isolated operation state are: the method step 1 is startup first peristaltic pump 1, Aeration fan 21, vacuum fan 23 keep running status, close the second peristaltic pump 2, other steps are identical, no longer repeat at this.
The operating performance of the laboratory simulation device repaired for groundwater pollution is introduced further below by specific embodiment.
First, said apparatus isolated operation multistage strengthening groundwater remediation technical modelling underground water ammonia nitrogen pollution reparative experiment is utilized, to repair underground water ammonia nitrogen pollution.
The ammonia-nitrogen content of simulated groundwater is 25mg/L.According to above-mentioned using method, enable multistage strengthening groundwater remediation technology repair system.By the ammonia nitrogen concentration of monitoring means regularly from simulation waterbearing stratum and vadose region 7 in sampling detection simulated groundwater, result shows, select zeolite media material to fill in reaction zone, median size is 2 ~ 5mm; Repair the general plant of Plants selection above district; When vadose region 7 selects median size 3 ~ 6mm haydite to fill, reparative experiment result shows, ammonia nitrogen concentration declines at least more than 20mg/L, and total removal rate reaches 92%.
Secondly, utilize said apparatus isolated operation soil vapor extraction technical modelling underground water volatile benzenes pollution amelioration to test, pollute to repair underground water volatile benzenes.
According to above-mentioned using method, this unit simulation soil vapor extraction technology is adopted to repair polluted soil and underground water.Volatile contaminant mainly benzene homologues and nonaqueous phase liquid in underground water.Device comprises simulation moisture thickness 250mm, induction pipe internal diameter 20mm, and 4 extraction wells, individual well aeration rate is 20L/min, and individual well rate of air sucked in required is 4L/min.Reparative experiment result shows, volatile contaminant clearance 83%.
Finally, said apparatus simultaneously combined running multistage strengthening groundwater remediation technology and the simulated groundwater organic contamination of soil vapor extraction technology repair system and ammonia and nitrogen pollution reparative experiment is utilized, to repair underground water Organic Contamination of Groundwater and ammonia and nitrogen pollution.
According to above-mentioned using method, adopt this unit simulation by organic contamination and ammonia and nitrogen pollution place, simulate moisture thickness 300mm, its permeability coefficient 10.2m/d.Pumped well 10 internal diameter 40mm, drinking-water pipe, induction pipe, sample tube inner diameter are 10mm, arrange 3 extraction wells.6 ~ 8mm zeolite is filled in reaction zone, and 5 ~ 7mm haydite is filled in quick vadose region 7.Simulator pump-out is 0.2L/min, and aeration rate is 20L/min.Reparative experiment result shows, organic pollutant removal rate 72%, ammonia nitrogen removal frank 84%.
In sum, according to the technical scheme of the embodiment of the present application, a kind of laboratory simulation device for groundwater pollution reparation provided according to the embodiment of the present application and using method thereof, can by the laboratory simulation device of multistage strengthening groundwater remediation technology and soil vapor extraction technology Remedy Technology of Contaminated Groundwater combined running, reduce the gap between Polluted Groundwater reparative experiment room simulated environment and actual environment, true reflection groundwater pollution repairs situation, for the engineer applied of multistage strengthening groundwater remediation technology and soil vapor extraction technology Remedy Technology of Contaminated Groundwater provides objective theoretical foundation.
Device embodiment described above is only schematic, and the wherein said unit illustrated as separating component or can may not be and physically separates.Those of ordinary skill in the art, when not paying performing creative labour, are namely appreciated that and implement.
Last it is noted that above embodiment is only in order to illustrate the technical scheme of the application, be not intended to limit; Although with reference to previous embodiment to present application has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the application.
Claims (10)
1., for the laboratory simulation device that groundwater pollution is repaired, it is characterized in that, it comprises:
Simulation waterbearing stratum unit, described simulation waterbearing stratum unit comprises water storage barrel, the first peristaltic pump and simulation waterbearing stratum, by described first peristaltic pump by described water storage barrel to described simulation waterbearing stratum water delivery;
Take out water distribution unit, described in take out water distribution unit and comprise pumped well, drinking-water pipe, the second peristaltic pump, aqueduct and T-shaped water distributor; Described pumped well and position drinking-water pipe is in the inner communicated with described simulation waterbearing stratum and outside, and the screen casing bottom described pumped well is positioned at below described simulation waterbearing stratum water level, and the intake of described drinking-water pipe is positioned at described screen casing bottom; Described second peristaltic pump one end is communicated with the top of described drinking-water pipe, and the other end is communicated with aqueduct, the other end end vertical connecting T-shaped water distributor of described aqueduct, and described T-shaped water distributor distributes multiple micropore;
Repair unit, described reparation unit comprises by the vadose region of the separated bottom of waterproof ventilated membrane, the overburden layer at top and reaction zone therebetween; Described vadose region is positioned at described pumped well periphery and communicates with described simulation waterbearing stratum bottom it; Current are in the S-type flowing of described vadose region packing layer; Current are in the S-type flowing of described reaction zone packing layer; In described overburden layer, vertical runs many can close airway, and the described airway that closes is communicated with described reaction zone and outside;
Air stripping unit, described air stripping unit comprises Aeration fan, pressure regulator valve, induction pipe, vacuum fan and extraction well, described Aeration fan is connected by described pressure regulator valve one end with described induction pipe, and the other end of described induction pipe stretches to below the water layer water level of described pumped well; Multiple through described reaction zone of described extraction well being positioned at described pumped well downstream is with overburden layer and be communicated with described simulation waterbearing stratum and outside, and described extraction well is connected with vacuum fan.
2., as claimed in claim 1 for the laboratory simulation device that groundwater pollution is repaired, it is characterized in that, also comprise: monitoring means, described monitoring means comprises multiple sampling tube, lays respectively at described simulation waterbearing stratum, reaction zone and vadose region.
3. as claimed in claim 1 for the laboratory simulation device of groundwater pollution reparation, it is characterized in that, described simulation waterbearing stratum unit also comprises adjustable overflow weir, described adjustable overflow weir is positioned at top, described simulation waterbearing stratum, and the water level that described adjustable overflow weir is used for described simulation waterbearing stratum remains on specified altitude assignment.
4., as claimed in claim 1 for the laboratory simulation device that groundwater pollution is repaired, it is characterized in that, described in take out water distribution unit and also comprise filtering net, described filtering net is positioned at described pumped well screen casing place and described drinking-water pipe intake place.
5., as claimed in claim 1 for the laboratory simulation device that groundwater pollution is repaired, it is characterized in that, described aqueduct is positioned at described reparation unit, and in described aqueduct, flow direction is parallel to described simulation waterbearing stratum flow direction.
6. as claimed in claim 1 for the laboratory simulation device that groundwater pollution is repaired, it is characterized in that, lay multiple dividing plate perpendicular to described pumped well in the packing layer of described vadose region and formed and arcly cross aquaporin, current are S-type flowing in the vertical direction.
7. as claimed in claim 1 for the laboratory simulation device of groundwater pollution reparation, it is characterized in that, the medium filler being used for absorption degradation is filled in described reaction zone, at least two divider upright are in described aqueduct and be interspersed in described reaction zone, and current are by flowing S-type on described dividing plate.
8. the using method of the laboratory simulation device repaired for groundwater pollution, when never running state conversion is to multistage strengthening groundwater remediation technology and soil vapor extraction technology repair system combined running state for the laboratory simulation device for groundwater pollution reparation as described in the arbitrary claim in claim 1-7, comprise following use step:
(1) start described first peristaltic pump and keep running status, then starting described Aeration fan, vacuum fan, the second peristaltic pump keep running status successively;
(2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize;
(3) described Aeration fan sucks air, after described pressure regulating device, is delivered to described simulation waterbearing stratum by described induction pipe, air and the abundant making contact of sewage, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase;
(4) in described simulation waterbearing stratum, the air of part containing volatile contaminant detaches to earth's surface by described vacuum fan by extraction well, by the process of gas recovery treatment unit; Part enters described reaction zone containing the air of volatile contaminant by described waterproof ventilated membrane, and by the packing layer adsorption treatment of described reaction zone and overburden layer;
(5) sewage in described simulation waterbearing stratum is pumped into described drinking-water pipe by the screen casing of described pumped well by described second peristaltic pump, after be delivered to described aqueduct, be uniformly distributed in described reaction zone after flowing to described T-shaped water distributor;
(6) pollutent in described reaction zone in sewage is by the packing layer adsorption treatment of described reaction zone and overburden layer, and the water purification stream seepage flow after process is back to described vadose region, and flows back into described simulation waterbearing stratum, forms water cycle.
9., as claimed in claim 8 for the using method of the laboratory simulation device of groundwater pollution reparation, when never running state conversion is to multistage strengthening groundwater remediation technology isolated operation state for device, comprise following use step:
(1) close described Aeration fan, vacuum fan, start described first peristaltic pump, the second peristaltic pump keep running status;
(2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize;
(3) sewage in described simulation waterbearing stratum is pumped into described drinking-water pipe by the screen casing of described pumped well by described second peristaltic pump, after be delivered to described aqueduct, be uniformly distributed in described reaction zone after flowing to described T-shaped water distributor;
(4) pollutent in described reaction zone in sewage is by the packing layer adsorption treatment of described reaction zone and overburden layer, and the water purification stream seepage flow after process is back to described vadose region, and flows back into described simulation waterbearing stratum, forms water cycle.
10., as claimed in claim 8 for the using method of the laboratory simulation device of groundwater pollution reparation, when never running state conversion is to soil vapor extraction technology isolated operation state for device, comprise following use step:
(1) close described second peristaltic pump, start described first peristaltic pump and keep running status, then start described Aeration fan, vacuum fan keep running status successively;
(2) carry sewage by described water storage barrel to described simulation waterbearing stratum by described first peristaltic pump, keep the flow rate of water flow in described simulation waterbearing stratum to stablize;
(3) described Aeration fan sucks air, after described pressure regulating device, is delivered to described simulation waterbearing stratum by described induction pipe, air and the abundant making contact of sewage, and the volatile contaminant in sewage passes liquid-gas interface and shifts to gas phase;
(4) in described simulation waterbearing stratum, the air of part containing volatile contaminant detaches to earth's surface by described vacuum fan by extraction well, by the process of gas recovery treatment unit; Part enters described reaction zone containing the air of volatile contaminant by described waterproof ventilated membrane, and by the packing layer adsorption treatment of described reaction zone and overburden layer.
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