Method of coagulating sludge

Details Method of coagulating sludge Method of coagulating sludge

1989-01-11

1991-04-09

Silverman, Stanley

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210728, 210732, 210734, C02F 156

Patent

active

050066390

ABSTRACT:
The present invention provides a method of coagulating sludge, which comprises adding sequentially an anionic polymer coagulant and a cationic polymer coagulant to sludge, and furthermore, adding an anionic polymer coagulant.
According to the present invention, it is possible to coagulate sludge at a far higher efficiency with a far smaller dewatering load than in the typical conventional methods using an inorganic salt and a pH adjusting reagent.

REFERENCES:
patent: 2798609 (1957-07-01), Smith et al.
patent: 3259570 (1966-07-01), Priesing et al.
patent: 3397139 (1968-08-01), Sak
patent: 4479879 (1984-10-01), Hashimoto et al.
patent: 4681688 (1987-07-01), Sondov et al.

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