Method for dewatering sludge

Details Method for dewatering sludge Method for dewatering sludge

1993-05-20

1995-01-17

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210712, 210768, 210770, 210804, C02F 1114

Patent

active

053823680

ABSTRACT:
In the Invention is directed to a method and apparatus for dewatering sludge wastes discharged from a factory such as pulp factory. Sludge wastes are first dewatered by a preliminary dewatering device such as a pre-thickener of a rotary screen type, sludge discharged from the preliminary dewatering device is then supplied to a main dewatering device such as a screw press. Waste liquid discharged from the preliminary and main dewatering devices are supplied to an agglutinating reaction tank together with a macromolecular agglutinating reagent and agglutinated substances in the agglutinating reaction tank are treated by the main dewatering device. The agglutinated substances formed on the bottom surface of the agglutinating reaction tank can be treated by a second main dewatering device other than the main dewatering device. A necessary amount of the macromolecular agglutinating reagent supplied to the agglutinating reaction tank can be reduced without deteriorating the dewatering efficiency.

REFERENCES:
patent: 3578586 (1971-05-01), Gal et al.
patent: 3684092 (1972-08-01), Busse et al.
patent: 4192743 (1980-03-01), Bastgen et al.
patent: 4997578 (1991-03-01), Berggren
patent: 5160440 (1992-11-01), Merai
patent: 5183562 (1993-02-01), Totoki et al.
patent: 5281340 (1994-01-01), Sato et al.

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