Pumpable aqueous slurries of sewage sludge

Details Pumpable aqueous slurries of sewage sludge Pumpable aqueous slurries of sewage sludge

1991-05-20

1994-10-18

Wyse, Thomas

Liquid purification or separation

Processes

Chemical treatment

210761, 210769, 210774, 48197R, 48197A, 48209, 110342, C02F 1114, C10J 346

Patent

active

053565401

ABSTRACT:
A pumpable aqueous slurry of sewage sludge as produced by the steps of (1) dewatering sewage sludge to produce an aqueous slurry having a solids content of about 10 to 25 wt. %; (2) pretreating said aqueous slurry of sewage sludge to improve its slurrying characteristics by one or a combination of (a) heating, (b) hydrothermal treatment, and (c) heating, mixing and shearing; and (3) mixing the following materials together at a temperature in the range of about ambient to 400.degree. F. to produce a pumpable aqueous slurry having a solids content in the range of about 30 to 65 wt. %: (a) pretreated aqueous slurry of sewage sludge; (b) a nonionic water soluble alkoxylated alkylphenol additive; and (c) sewage sludge-containing material and/or solid carbonaceous fuel-containing material to increase the solids loading.

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patent: 5264009 (1993-11-01), Khan

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