Anaerobic digestion process for organic wastes

Details Anaerobic digestion process for organic wastes Anaerobic digestion process for organic wastes

1983-11-15

1985-01-01

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210605, 210630, 48197A, 435167, 435801, C02F 328, C02F 330

Patent

active

044915225

ABSTRACT:
The present invention relates to an anaerobic digestion process for organic wastes with a high efficiency and an improved recovery rate of methane.
This process comprises the following steps: (1) anaerobically digesting organic wastes under simultaneous presence of facultative anaerobic bacteria and obligatory anaerobic bacteria, (2) separating the anaerobically digested slurry obtained from the step (1) into a liquor fraction containing the two groups of bacteria and an undecomposed solid fraction, (3) mixing the liquor fraction obtained from the step (2) with the surplus activated sludge slurry produced by anaerobically treating organic waste water, under anaerobic condition, (4) separating the mixed slurry obtained from the step (3) into a solid fraction containing the surplus activated sludge which has absorbed the two groups of bacteria and a liquor fraction, and recycling back the solid fraction obtained from the step (4) as the sources of the two groups of bacteria and nitrogen to the step (1).

REFERENCES:
patent: 4213857 (1980-07-01), Ishida et al.
patent: 4297216 (1981-10-01), Ishida et al.
patent: 4375412 (1983-03-01), Schimel
patent: 4442006 (1984-04-01), Ishida et al.

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