DE3214798A1 - Method and device for the anaerobic processing of waste - Google Patents

Abstract

Method for the anaerobic processing of plant and animal biomass, also of waste, consisting of organic materials with relatively high molecular weight, in which in a reactor chamber the high molecular weight organic materials are converted by bacterial strains into organic materials with low molecular weight and the latter are converted into lower organic acids with the formation of H2, CO2 and H2S in acetic acid, then the resulting substances are converted by methane-producing bacteria into CH4 and CO2, there being a division of acid phase and methane phase in the reactor chamber (or chambers) preferably in inverse relation to the breakdown rates of the process stages of acid production and methane production, whereby the broken- down products sink to the bottom in the partitioned chamber for the acid phase and reach the fermentation chamber for the methane production, with the resulting gases, especially CO2 and H2S, being separated out from the first phase of the method, the acid phase.

Description

Method and device for anaerobic treatment of

- === ====== = waste addition to patent (patent application P 31 02 739.3) The main patent ... ... (patent application P 31 02 739.3) relates to a process for the production of biogas from plant and animal biomass, including waste, according to the preamble of claim 1.

It has now been found that the in the first phase, the acid phase, the gases produced during the decomposition process, mainly CO2 and H2S, the others Load the process flow and especially in costly, energy-intensive separation passages must be separated from the methane-containing biogas produced as the end product.

When storing the biogas, they can only be used as dietary fiber Serving gases, such as CO2 and H2S, for reasons of space requirements not in the Biogas remain and the energy yield would be reduced by these gases. In addition, H2S would have a strong corrosive effect on the pipe system.

According to the invention it has now been found that this is caused by the entrainment the disadvantages arising from ballast gases can be avoided if these gases, in particular H2S and CO2, already in the first breakdown phase, the acid phase a drain pipe can be removed.

The invention accordingly also relates to a bioreactor for implementation of the method according to claim 2, in which at least one discharge line (7) from d.:fl Acid formation section (4) is provided for discharging the gases formed.

It is also particularly advantageous if the acid compartment (i) 4 and the Methane compartment (e? 6 is completely filled with liquid.

This can be achieved by keeping the liquid level in the filling or discharge nozzle is kept higher than the rest of the level.

Incidentally, in the discharge part of the methane formation zone (s) 6, an overflow line 3 must be available for discharging the used biomass.

The figure shows an exemplary embodiment of the invention The invention is of course to all embodiments, in particular to shown in the main patent.

In the figure, 1 denotes the introduction line for the biomass, 4 denotes the Fermentation room for the acid formation stage, 7 the discharge line for those in 4 Gases, 5 the floor space open at the bottom for the transition to the fermentation room for methane formation 6. The methane-containing biogas is discharged via line 2, while the degraded biomass is discharged via the overflow 3.

Claims (2)

Claims == s ====== ~ =========== ~ ======= 1. Method of anaerobic Processing of plant and animal biomass, including waste, consisting of relatively high molecular weight organic materials in which in a reactor space the high molecular weight organic materials through bacterial strains into organic Low molecular weight materials and these into lower organic acids are converted into acetic acid with the formation of H2, CO2 and H2S, then the resulting Substances are converted into CH4 and CO2 by methane-forming bacteria, whereby in the reactor room (s) there is a division of acid phase and methane phase preferably in inverse proportion to the degradation rates of the acid formation process stages and methane formation takes place, whereby in the (the) partitioned room (s) for the Acid phase the degraded products (mainly acetic acid and H2) down sink and through one or more open connections into the fermentation room for methane formation, according to patent .. .. * .. (patent application P 31 02 739.3), characterized in that from the first phase, the acid phase, the resulting Gases, especially C02 \ and H2S, are discharged through a discharge line and not burden the rest of the process more than ballast. 2. Bioreactor for performing the method according to claim 1, containing an inlet line (1) for the organic substance to be treated, areas (4) for the treatment of the biomass with acid-forming bacteria including a below lying area (5) for the formation of acetic acid, one with it in open Related area (6) for methane formation, preferably the ratio of the acid generating area to the methane generating area in the inverse proportion to the degradation rates of acid formation and methane formation, a gas outlet (2) and a discharge (3) for the degraded biomass, characterized by an outlet line (7) for the gases produced in the acid formation room (4).