Liquid purification or separation – Processes – Treatment by living organism
Patent
1994-02-28
1995-09-19
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210609, 210613, C02F 328
Patent
active
054513197
ABSTRACT:
An anaerobic digestion process for sewage sludge comprises the steps of dewatering raw sewage sludge to provide a solids content therein in the range of 10 to 25 weight %, recirculating a portion of digested sludge resulting from methane fermentation and having a dry solids content lower than that of said dewatered raw sewage sludge, adding one part by weight of the dewatered raw sewage sludge to at least one part by weight of the recirculated digested sludge, homogeneously kneading the resulting mixture for inoculation, and causing methane fermentation of the inoculated sludge mixture in a tube-shaped digestor. The inoculated sludge is moved in the longitudinal direction of the tube in the digestor during methane fermentation, and a portion of the sludge discharged from the digestor is recirculated.
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Webster's Third New International Dictionary of the English Language, p. 218 (1971).
Biotechnology Encyclopedia, p. 625 (1986).
Methane Production from Agricultural and Domestic Wastes, Hobson et al., Applied Science Publishers, Ltd., London (1981), pp. ix-xi.
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