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Molecular Biology

Anaerobic-digestion-process-for-organic-wastes

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Anaerobic digestion process for organic wastes

Details

Inventors: Ishida, Masahiko; Haga, Ryoichi; Ishibashi, Tadashi; Odawara, Yoji;
Assignee: Agency of Industrial Science & Technology (Tokyo, JP)
Primary Examiner: Castel; Benoit
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch

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).

DETAILED DESCRIPTION The objective of the present invention is to eliminate the aforementioned drawbacks of the conventional art and present an anaerobic digestion process of organic wastes.
The first characteristic feature of the present invention is the formation of excess activated sludge flocs which hold anaerobic bacteria therein without letting them lose their fermentation activity, by bringing anaerobic bacteria in contact with excess activated sludge under anaerobic conditions, after adding excess activated sludge to the processing waste water that is the anaerobically digested slurry from which undigested solids are removed.
The second characteristic point of the present invention is to recycle back to the anaerobic fermentation tank the anaerobic bacteria and excess activated sludge composite after separating them from each other.

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