Method of dewatering difficult sludges

Details Method of dewatering difficult sludges Method of dewatering difficult sludges

1998-09-18

2000-07-04

Simmons, David A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210727, 210728, 210724, 210735, C02F 152, C02F 154

Patent

active

060834048

ABSTRACT:
The present invention provides a new method for dewatering difficult sludges, such as autothermal thermophilic aerobic digestion sludges. The method incorporates a three-component treatment system. Initially, the difficult sludge is dosed with an inorganic coagulant and then the resulting sludge-inorganic mixture is dosed with a microparticle component. Lastly, the resulting mixture is dosed with a high molecular weight flocculant.

REFERENCES:
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patent: 4382864 (1983-05-01), Hashimoto et al.
patent: 4588508 (1986-05-01), Allenson et al.
patent: 5779910 (1998-07-01), Donlin
patent: 5846433 (1998-12-01), Sorensen et al.
WEFTEC '97 Proceedings from Residual & Biosolids Management vol. 2, p.p. 299-309 (1997).
"Dewaterability of ATAD Sludges" Clyde Burnett, P.E. & Allen Woelke, P.E., Camp Dresser & McKee Inc. Steven Dentel, Ph.D., P.E., University of Delaware.

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