Aerobic digestion of sludge

Details Aerobic digestion of sludge Aerobic digestion of sludge

1985-01-11

1986-05-06

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210613, 210620, C02F 1102

Patent

active

045870195

ABSTRACT:
In the aerobic digestion of sludges, particularly but not exclusively primary sedimentation sewage sludges, a layer of sludge foam is deliberately maintained over the sludge surface to improve the efficiency of the process. The layer of foam may have a volume of at least 50% of that of the sludge. The digestion process is effected in a digester, in which the amount of foam may be reduced (as necessary) by injecting sludge directly into the foam to cause local collapse thereof. A digester vessel especially suited for use in the process is described.

REFERENCES:
patent: 2772234 (1956-11-01), Kelly
patent: 3397140 (1968-08-01), Dea
patent: 3745113 (1973-07-01), Fuchs
patent: 3787316 (1974-01-01), Brink et al.
patent: 4069149 (1978-01-01), Jackson
patent: 4493770 (1985-01-01), Moilliet
Korrespondenz Abwasser, Nov. 1984, pp. 934-939.

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