Liquid purification or separation – Processes – Treatment by living organism
Patent
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.
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Good, Jr. Frederick J.
Highsmith Ronald E.
Kehrer Kenneth P.
Lupton Francis S.
Petrie Glenn E.
Fisher Richard V.
Phipps Robert M.
Polypure, Inc.
Upton Christopher
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