Process for the disinfection of sewage sludge

Details Process for the disinfection of sewage sludge Process for the disinfection of sewage sludge

1989-04-20

1990-12-04

Fisher, Richard V.

Liquid purification or separation

Processes

Treatment by living organism

210612, 210758, 210764, 210766, C02F 300, C02F 1102

Patent

active

049751948

ABSTRACT:
The process for the disinfection of sewage sludge prior to introducing same into an anaerobic sewage sludge processing step involving the recovery of methane gas by heating the sewage sludge in a preceding disinfection step at from 50.degree. C. to 70.degree. C., and preferably at from 55.degree. C. to 65.degree. C., for a period of from 1 to 72 hours, and preferably of from 12 to 36 hours, while throughly mixing the sewage sludge with an oxygen-containing gas is carried out by using, as the oxygen-containing gas, a mixture comprising from 10 to 70% by volume of fresh air and 30 to 90% by volume of vent gas from the disinfection step, the oxygen contents of the gas mixture being maintained within the range of from 5 to 15% by volume, and preferably of from 7 to 12% by volume.

REFERENCES:
patent: 3670887 (1972-06-01), McWhirter
patent: 3926794 (1975-12-01), Vahldieck
patent: 4029574 (1977-06-01), Reimann
patent: 4132637 (1979-01-01), Key et al.
patent: 4178239 (1979-12-01), Lowther
patent: 4246099 (1981-01-01), Gould et al.
patent: 4276174 (1981-06-01), Breider et al.
patent: 4493770 (1985-01-01), Moilliet
G.M.F. Wasser Abwasser, Jan. 1984, "Das Gas und Wasserfach".
G. W. F. Wasser Abwasser, Sep. 1986, pp. 442-448, "Neue Einsatzbereiche fur . . . .", Klaus Breitenbucher.
Korrespondenz Abwasser, Jan. 1988, pp. 71-74, "Entseuchung von Klarschlamm".
Korrespondenz Abwasser, "Zweistufige Aerob-Thermophil/Anaerobe . . . ", J. Jakob et al., 1987.

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