Liquid purification or separation – Processes – Treatment by living organism
Patent
1990-10-15
1994-03-01
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210609, 210613, C02F 1104
Patent
active
052904504
ABSTRACT:
An anaerobic digestion process for sewage sludge comprises a first step of dewatering the raw sewage sludge to provide a solids content therein of at least 10 weight %. A portion of digested sludge resulting from methane fermentation is recirculated and added to the dewatered raw sludge, the weight ratio of digested sludge to dewatered raw sludge being at least 1:1. The resulting mixture is homogeneously kneaded and then subjected to methane fermentation. At least one of the dewatered raw sludge prior to the recirculating step and the kneaded sludge mixture during methane fermentation is subjected to thermal treatment at a temperature not less than 50.degree. C.
REFERENCES:
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patent: 3959125 (1976-05-01), Teletzke
patent: 3981800 (1976-09-01), Ort
patent: 4040953 (1977-08-01), Ort
patent: 4088571 (1978-05-01), Helgesson
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patent: 4396402 (1983-08-01), Ghosh
patent: 4400195 (1983-08-01), Rijkens
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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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