Process for dewatering of biological sludge

Details Process for dewatering of biological sludge Process for dewatering of biological sludge

1988-11-07

1991-01-29

Fisher, Richard V.

Liquid purification or separation

Processes

Treatment by living organism

210732, 210734, 210737, 210770, 210774, 210806, C02F 102

Patent

active

049884425

ABSTRACT:
The present invention provides an improved biological sludge dewatering process. The process comprises the steps of: (a) heating biological sludge to a temperature of about 90.degree. to about 150.degree. C. which corresponds to a pressure of about 0 to about 55 psig and retaining the biological sludge at that temperature for less than about 15 minutes; (b) centrifuging the heated biological sludge to isolate the solids of the heated biological sludge from the liquid of the heated biological sludge; (c) chemically conditioning the isolated solids; and (d) dewatering the conditioned solids to produce a high solids biological sludge. The present process is used for dewatering any biological sludge to produce a high solids cake. The resulting high solids cake may be used as landfill, incinerated, or used as fertilizer by spreading on land and plowing said fertilizer into the soil.

REFERENCES:
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patent: 3414514 (1968-12-01), Buhl
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patent: 4289625 (1981-09-01), Tarman et al.
patent: 4396513 (1983-08-01), Haldeman
patent: 4479879 (1984-10-01), Hashimoto et al.
patent: 4604213 (1986-08-01), Fong et al.
patent: 4673510 (1987-06-01), Janusch et al.
patent: 4713178 (1987-12-01), Fong et al.
patent: 4810393 (1989-03-01), Guinard

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