WO2008102083A1 - Method for extracting biogas and corresponding device - Google Patents
Method for extracting biogas and corresponding device Download PDFInfo
- Publication number
- WO2008102083A1 WO2008102083A1 PCT/FR2007/052381 FR2007052381W WO2008102083A1 WO 2008102083 A1 WO2008102083 A1 WO 2008102083A1 FR 2007052381 W FR2007052381 W FR 2007052381W WO 2008102083 A1 WO2008102083 A1 WO 2008102083A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- value
- measured
- extraction
- pressure
- setpoint
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B1/00—Dumping solid waste
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/40—Means for regulation, monitoring, measurement or control, e.g. flow regulation of pressure
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
- C12M41/48—Automatic or computerized control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Definitions
- the present invention relates to the field of biogas extraction. More specifically, according to a first aspect, the invention relates to a method for controlling the extraction of biogas from an enclosure (50) equipped with at least one extraction assembly (31A, 31B), each set of extraction being connected to a respective manifold (70A, 70B) via a respective control valve (10A, 10B) and comprising at least one unitary extraction device (311A, 312A, 313A, 31B), the method comprising the steps of: providing a respective predetermined collector pressure (Pr) to each manifold (70A, 70B), and opening the control valve (10A, 10B) in a given position.
- Pr collector pressure
- Biogas extraction depends on internal parameters (type of waste, bacteria, amount of air / oxygen, age of waste), and parameters external to the enclosure. The distribution of production areas within a compound is heterogeneous.
- the biogas extraction is controlled well by well.
- the proposed system includes a sensor measurement device in each wellhead for measuring flow rate, vacuum, temperature, and O2 / CH4 / CO2 content of the extracted gas.
- the measurement information is sent to a remote computer which, in return, with reference to a model, controls the respective opening / closing of a pneumatic control valve of each well, the pneumatic control valve for adjusting the flow of gas extracted wells per well.
- the extraction of gas is based on a setpoint, dependent on weather forecasts, so that the setpoint is lowered in advance when weather forecasts provide for a drop in atmospheric pressure.
- the present invention aims to overcome these disadvantages by proposing a solution to capture the biogas optimally, that is to say, the captured flow is equal to the flow rate produced by the waste.
- the device according to the invention is essentially characterized in that it further comprises the steps of: measuring the value of a weather parameter external to the chamber, - calculating a global setpoint (dPci) of differential pressure as a function of the value of the measured meteorological parameter, measure the relative pressure (dPi) at at least one extraction unit, - compare the measured relative pressure with the setpoint (dPci), and make a change of position of the control valve ( 1OA, 10B) according to the result of the comparison.
- the method further comprises the steps of: providing a first local setpoint (dPcil) by comparing the value of the meteorological parameter (s) measured with a model of reference, the step of calculating the global setpoint (dPci) being a function of said first local setpoint (dPcil).
- the measured external meteorological parameter is comprised in the set comprising atmospheric pressure, outside temperature and rainfall.
- the method further comprises the steps of: measuring the value of a physicochemical parameter of internal regulation included in the set (content of O2 / CH4 / CO2, temperature, pressure) at the level of at least one extraction set, comparing the measured value with a reference value , and provide a second local setpoint (dPci2) according to the result of the comparison, - the step of calculating the global setpoint
- the reference model is constructed by a preliminary learning step, in which the evolution of the internal pressure in the waste mass is measured as a function of the value of the external parameter (s) and / or internal (s) measured.
- the relative pressure obtained at the extraction system is dependent on the relative pressure value imposed on the collector by the biogas suction systems. In all cases the pressures
- the invention also relates, in another of its aspects, to a device for controlling the extraction of biogas, capable of implementing the method according to the invention, the device comprising: an enclosure (50) equipped with at least one extraction assembly (31A, 31B), each extraction assembly being connected to a respective manifold (70A, 70B) via a respective control valve (10A, 10B) and comprising at least one unitary extraction device (311A,
- the device is essentially characterized in that it further comprises means for measuring the value of a weather parameter external to the enclosure, means for calculating a global differential pressure setpoint (dPci) as a function of the value. the meteorological parameter measured, - means for measuring the differential pressure (dPi) at at least one extraction unit, means for comparing the measured relative pressure with the set value (dPci), and - means for perform a change of position of the control valve (10A, 10B) according to the result of the comparison.
- dPci global differential pressure setpoint
- the device further comprises: means for providing a first local instruction (dPcil) by comparing the value of the meteorological parameter (s) measured with a reference model , the step of calculating the global setpoint (dPci) being a function of said first local instruction
- the device according to the invention further comprises learning means, configured to measure the evolution of the internal pressure (Pi) as a function of the value of the external weather parameter (s) ( s) measured, the reference model being constructed from the means of learning.
- learning means configured to measure the evolution of the internal pressure (Pi) as a function of the value of the external weather parameter (s) ( s) measured, the reference model being constructed from the means of learning.
- the device further comprises: means for measuring the value of an internal physico-chemical parameter included in the set (O2 / CH4 / CO2 content) in at least one set of extraction, means for comparing the measured value with a reference value, and - means for supplying a second local instruction (dPci2) according to the result of the comparison, the global setpoint (dPci) being a function of said second local instruction ( dPci2).
- the external disturbances can be taken into account. Now these external disturbances play a major role in the diffuse emissions, we can extract a few% more biogas compared to the prior art.
- the invention thus makes it possible to damp the variations in biogas production due to external parameters, as well as internal parameters due to the operation of a plurality of networked speakers. Thanks to the invention, it is possible to extract a determined quality of biogas, that is to say a biogas having a determined content of methane in a given range. Maintaining a predetermined constant quality ensures optimal recovery of the biogas extracted, especially since the recovery systems do not accept significant variations in methane content.
- the invention makes it possible to minimize variations in the quality of biogas related to atmospheric phenomena. In fact, when only the percentage of methane in a well is measured and controlled, the result of the depression disturbances is evaluated only a few hours later.
- the depression can be adjusted at each well so that it can be adapted over time depending on the quality of the methane and the atmospheric variations, that is to say that the variation of depression applied through the model
- FIG. 1 is a representation of a mode embodiment of the device according to the invention
- - Figure 2 is a block diagram of an embodiment of the method according to the invention.
- the device according to the invention comprises an enclosure 50 equipped with a first assembly 31A of first unitary extraction devices, in this case wells 311A, 312A, 313A, connected to a collector 70A by via a control valve 1OA.
- the device may comprise at least a second set 31B of second unitary extraction devices, in this case a second well 311B connected to a collector 7OB through a control valve 1OB.
- Each set may therefore include a plurality of unitary extraction devices and the device may include a plurality of networked assemblies as described later.
- Each unitary extraction device hereinafter referred to as the well, comprises a suction head 41A, 42A,
- each set includes a wellhead, respectively 20A and 20B.
- the control valve 10A, 10B is mounted between the well heads 20A, 20B respectively and the respective primary collectors 7OA, 7OB.
- the collectors 70A, 70B are connected to a main manifold 70 by a suitable pipe network, so that in other embodiments, the collectors 70A, 70B and 70 may be the same.
- the device comprises means, not shown, such as a constant or variable flow pump, for supplying a collector pressure Pr, in the negative case, that is to say a vacuum dPci, to the collector (s). (s) 7OA, 7OB.
- the device also comprises means 60, 10 for automatically selectively opening the control valve 10A, 10B respectively in a given position.
- these means comprise control means 60, in this case a computer or an automaton.
- the control means can directly control the control valve 10A, 10B. They comprise, or are coupled to, regulating means 10.
- the regulating means comprise a first and a second regulator, they are configured for calculating and transmitting pressure instructions, which results in a change of valve position from control 10A, 10B according to different parameters, as described later.
- control means 60 can be done by any known means, with or without wire, the control means 60 can therefore be arranged remotely.
- the device according to the invention also comprises meteorological means 90 for measuring the value of at least one meteorological parameter external to the enclosure, in this case a pressure sensor for atmospheric pressure, a thermometer for temperature, and a Rain gauges for rainfall are arranged on the surface, preferably close to the enclosure 50.
- meteorological means 90 communicate with the control means 60.
- the control means 60 advantageously comprise prediction means, in this case a control model. reference in software form for predicting the evolution of the internal pressure Pi at each extraction set as a function of the value of the meteorological parameter (s) measured.
- the value of the meteorological parameter (s) measured is compared with the reference model, so as to provide a first, so-called local, pressure setpoint dPcil, by a regulator R ". a first regulation loop.
- the first control loop is said to be slow in that it takes into account the changes due to the outside diurnal / nocturnal conditions, season, and other atmospheric effects.
- the first dPcil instruction allows to obtain a constant quality of the extracted biogas according to the set of gas quality (that is to say substantially the methane content included in the biogas), set by the operator.
- the methane content represents an example of an internal parameter setpoint; in another embodiment it can be the depression dPi, the temperature of the gas, the content of O2 or CO2, etc.
- the reference model is constructed by a prior learning step.
- the learning consists, for example, in measuring the evolution of the internal pressure Pi as a function of the meteorological parameter (s) measured.
- This evolution can be registered as a reference model in the control means 60.
- the model can be established beforehand, and possibly updated continuously during operation of the enclosure. At a given moment, the measurement of a given meteorological parameter is compared to its nearest value in the model. The corresponding internal pressure is then estimated by the preliminary learning phase. Thanks to the reference model constructed with a learning step, it is possible to carry out a step of predicting the evolution of the internal pressure Pi as a function of the meteorological parameter (s) measured, and to provide an appropriate local dIpc instruction.
- control means 60 Based on this prediction of the evolution of the internal pressure Pi, the control means 60 then issue a position change command of the control valve 1OA, 1OB.
- the detection of an external weather variation makes it possible to anticipate, to predict the variation of biogas production, and thus the internal pressure Pi to a set of wells.
- the level of methane extracted from the biogas remains constant.
- the device according to the invention advantageously comprises, in addition, means for measuring the value of a physico-chemical parameter internal to the enclosure comprised in the assembly (O2 / CH4 / CO2 content, biogas quality, pressure, etc.) at least one well, in this case suitable sensors. Measurements of at least one of the parameters included in the set are preferably performed sequentially from one extraction head to another, and periodically.
- the measured content is compared with a reference value, for example by the control means 60, which emit a second pressure setpoint dPci2, called local, allowing the positional change of the control valve 10A, 1OB as a function of the result of the comparison, the global setpoint dPci being a function of said second local setpoint dPci2.
- the second setpoint dPci2 is provided by a regulator R'1 of the first regulation loop.
- the regulation means 10 comprise a feedback loop, linking the value of the comparison and the value of the opening / closing of the control valve, so as to obtain a precise opening / closing (position), and not an all-or-nothing opening / closing.
- the global pressure setpoint dPci is a function of the two local pressure setpoints dPcil, and dPci2, in particular the global setpoint dPci is the sum of the local setpoints dPcil + dPci2.
- the first level of regulation therefore preferably comprises two regulators.
- the prediction made at the regulator R "1 is corrected by the measurement carried out at the regulator R 1 I. This correction makes it possible at the same time to limit the introduction of air into the enclosure, therefore of oxygen, in case of increase of the atmospheric pressure, and to limit any leakage of methane, in the event of a drop in atmospheric pressure, thus the control valve position setpoint is calculated to always be at the optimum.
- the device according to the invention can also undergo internal disturbances.
- a biogas extraction site is a system comprising a plurality of devices as described and interconnected with a main manifold 70 via a network of pipes.
- the main collector is connected to means 80 for treating the biogas (recovery, flare, etc.).
- the device according to the invention comprises means for measuring the differential pressure dPi at the level of at least one extraction unit.
- the measured relative pressure dPi is compared with a setpoint value dPci and a change of position of the control valve is made, according to the result of the comparison, by the regulator R1.
- the regulator R1 sends a control signal opening / closing of the control valve, defining a depression value to be applied at this valve.
- the regulator R1 has as input parameter at least the differential pressure, and possibly the local temperature, on either side of the valve considered, these variables being measured.
- the regulator R1 has as its reference a differential pressure value determined dPci. If the measured differential pressure dPi is different from the setpoint value, the valve position is modified by regulation means 10, to obtain the differential pressure differential.
- the control means 60 are advantageously used as means for comparing the measured relative pressure with a reference value, and as means for supplying, via the regulation means 10, a first setpoint change of position of the control valve as a function of the result. of the comparison.
- the setpoint dPci is fixed, predetermined for each of the extraction heads.
- this setpoint is advantageously determined as a function of the first control loop.
- the external parameter is the external temperature, because the temperature influences the biological reactions and therefore the biogas production (decrease of activity with a drop in temperature, for example in winter). However, the influence of the temperature remains lower than the influence of the two following parameters (rainfall and pressure).
- the external parameter is rainfall. There exists on the surface of an enclosure a so-called zone of web beat. These zones have a thickness of the order of magnitude of a few meters, typically 4-5 m. Because of their geological situation, these zones are alternately aerobic and anaerobic depending on the rainfall, and therefore unusable for methanogenesis because they are not maintained under strict anaerobic conditions.
- these upper layers of the enclosure are clay (clay or other).
- the clay works as an impermeable layer, and the capture flow can be increased.
- the thickness of the beat zone is greatly reduced, or even almost zero, by controlling the extraction of biogas.
- the invention advantageously anticipates the impact of rainfall on the extraction of biogas, since the precipitation causes clogging of the clay cover. This favors a reduction of the air inlets and allows the increase of the depression to be supplied in the mass of waste to capture more biogas. In addition, a drought period creates cracks in the cover and creates emissive zones.
- the invention makes it possible to limit the inflow of air into the mass of waste, by regulating also the oxygen content present in the biogas.
- the invention optimally captures the biogas, so as to avoid both the introduction of air and a methane emanation.
- the surface of an enclosure may be of the order of magnitude of the hectare.
- an atmospheric pressure variation of 2 mBar / h generates a change in volume of biogas of about 200 m3 / h, after a certain lag time ( transmission / inertia time of the device). With respect to oxygen, it inhibits methanogenesis.
- measurement means can be provided in the extraction heads and a set point relating to the oxygen content at the first regulation level, so that the extracted oxygen does not exceed a certain amount, therefore to maintain a certain quality of the biogas.
- measurement means can be provided in the waste mass, which reflects a possible air inlet into the chamber. The measured value can then be used in the second control loop.
- cover 110 it is waterproof, or semi-permeable, according to local needs and regulations.
- a waterproof cover makes it possible to use a larger depression, and therefore to extract more biogas.
- the depression of the collector Pr is greater than or equal to the internal depression Pi of the waste mass, which ensures that the methane is not released into the atmosphere.
- the invention can be implemented in particular according to two modes of operation.
- the extraction of biogas greatly limits the diffusion of methane in the surrounding lands.
- the flow can be maximized.
- control systems which anticipate the internal / external disturbances maintain a constant quality of biogas over time.
- the flow of methane extracted from the biogas can be maintained a predetermined value.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2009008630A MX2009008630A (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device. |
US12/526,921 US20110048722A1 (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device |
AU2007347378A AU2007347378B2 (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device |
BRPI0721329-8A BRPI0721329A2 (en) | 2007-02-13 | 2007-11-22 | BIOGAS EXTRACTION PROCESS AND CORRESPONDING DEVICE |
CN2007800512436A CN101631627B (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device |
EP07858727A EP2117736A1 (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device |
IL199795A IL199795A0 (en) | 2007-02-13 | 2009-07-09 | Method for extracting biogas corresponding device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0701043 | 2007-02-13 | ||
FR0701043A FR2912331B1 (en) | 2007-02-13 | 2007-02-13 | METHOD OF EXTRACTING BIOGAS AND DEVICE THEREFOR |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008102083A1 true WO2008102083A1 (en) | 2008-08-28 |
Family
ID=38266690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2007/052381 WO2008102083A1 (en) | 2007-02-13 | 2007-11-22 | Method for extracting biogas and corresponding device |
Country Status (10)
Country | Link |
---|---|
US (1) | US20110048722A1 (en) |
EP (1) | EP2117736A1 (en) |
CN (1) | CN101631627B (en) |
AU (1) | AU2007347378B2 (en) |
BR (1) | BRPI0721329A2 (en) |
CO (1) | CO6231012A2 (en) |
FR (1) | FR2912331B1 (en) |
IL (1) | IL199795A0 (en) |
MX (1) | MX2009008630A (en) |
WO (1) | WO2008102083A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010126366A1 (en) * | 2009-04-28 | 2010-11-04 | Stichting Dienst Landbouwkundig Onderzoek | Method and apparatus for digestion of biomass |
EP2889363B1 (en) * | 2013-12-27 | 2017-03-01 | Liepajas Universitate | Optimal anaerobic environment maintenance system for producing biogas |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026355A (en) * | 1975-06-30 | 1977-05-31 | Nrg Nufuel Company | Method for testing and monitoring for producing landfill gas |
US5063519A (en) * | 1989-09-18 | 1991-11-05 | Pacific Energy | Landfill gas production testing and extraction method |
EP0904857A1 (en) * | 1997-09-17 | 1999-03-31 | Société publique d'Aide à la Qualité de l'Environnement, S.P.A.Q.U.E., Société Anonyme | Method and system for withdrawing gases produced by fermentable materials, particularly waste |
US6169962B1 (en) * | 1996-05-07 | 2001-01-02 | Landfill Gas & Environmental Products, Inc. | Systems and methods for controlling gas flow from landfills |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5269930A (en) * | 1990-07-13 | 1993-12-14 | Isco, Inc. | Apparatus and method for supercritical fluid extraction |
US5614089A (en) * | 1990-07-13 | 1997-03-25 | Isco, Inc. | Apparatus and method for supercritical fluid extraction or supercritical fluid chromatography |
CN2268706Y (en) * | 1996-09-05 | 1997-11-26 | 范雄杰 | Methane collecting and compressing apparatus |
US8631657B2 (en) * | 2003-01-22 | 2014-01-21 | Vast Power Portfolio, Llc | Thermodynamic cycles with thermal diluent |
CN101213008B (en) * | 2005-05-03 | 2011-09-28 | 高级技术材料公司 | Fluid storage and dispensing systems, and fluid supply processes comprising same |
-
2007
- 2007-02-13 FR FR0701043A patent/FR2912331B1/en active Active
- 2007-11-22 EP EP07858727A patent/EP2117736A1/en not_active Withdrawn
- 2007-11-22 BR BRPI0721329-8A patent/BRPI0721329A2/en not_active IP Right Cessation
- 2007-11-22 MX MX2009008630A patent/MX2009008630A/en not_active Application Discontinuation
- 2007-11-22 WO PCT/FR2007/052381 patent/WO2008102083A1/en active Application Filing
- 2007-11-22 US US12/526,921 patent/US20110048722A1/en not_active Abandoned
- 2007-11-22 CN CN2007800512436A patent/CN101631627B/en active Active
- 2007-11-22 AU AU2007347378A patent/AU2007347378B2/en active Active
-
2009
- 2009-07-09 IL IL199795A patent/IL199795A0/en not_active IP Right Cessation
- 2009-07-24 CO CO09077136A patent/CO6231012A2/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4026355A (en) * | 1975-06-30 | 1977-05-31 | Nrg Nufuel Company | Method for testing and monitoring for producing landfill gas |
US5063519A (en) * | 1989-09-18 | 1991-11-05 | Pacific Energy | Landfill gas production testing and extraction method |
US6169962B1 (en) * | 1996-05-07 | 2001-01-02 | Landfill Gas & Environmental Products, Inc. | Systems and methods for controlling gas flow from landfills |
EP0904857A1 (en) * | 1997-09-17 | 1999-03-31 | Société publique d'Aide à la Qualité de l'Environnement, S.P.A.Q.U.E., Société Anonyme | Method and system for withdrawing gases produced by fermentable materials, particularly waste |
Also Published As
Publication number | Publication date |
---|---|
AU2007347378B2 (en) | 2012-08-16 |
CN101631627B (en) | 2011-06-15 |
FR2912331A1 (en) | 2008-08-15 |
FR2912331B1 (en) | 2011-08-26 |
CN101631627A (en) | 2010-01-20 |
US20110048722A1 (en) | 2011-03-03 |
IL199795A0 (en) | 2010-04-15 |
EP2117736A1 (en) | 2009-11-18 |
AU2007347378A1 (en) | 2008-08-28 |
BRPI0721329A2 (en) | 2014-02-25 |
MX2009008630A (en) | 2009-11-02 |
CO6231012A2 (en) | 2010-12-20 |
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