Sludge treatment apparatus

Details Sludge treatment apparatus Sludge treatment apparatus

1991-04-26

1992-02-25

Dawson, Robert A.

Liquid purification or separation

With heater or heat exchanger

210177, 210178, 210179, 210180, 210181, 210199, 210400, 210401, 210406, 210205, B01D 3300

Patent

active

050910795

ABSTRACT:
A process and apparatus for reducing sludges, especially those sludges containing heavy metals and generated in electroplating, to a solid state where the toxic constituents of the waste are prevented from leaching. The process involves mixing a metallic soap with the sludge and then using low-temperature induction heating to form coacervate bonds that encapsulate the toxic waste particles in a pumice-like matrix. The apparatus allows a small amount of metallic soap to be thoroughly mixed through sludge and a continuous ribbon of the resulting putty-like waste to be fed into a series of microwave drying ovens and evacuation chambers. After the drying and dewatering sequences, the apparatus extrudes a pumice-like solid suitable for disposal in accordance with EPA regulations.

REFERENCES:
patent: 4043047 (1977-02-01), Galliker
patent: 4221680 (1980-09-01), Hardwick
patent: 4226712 (1980-10-01), Kamei
patent: 4242220 (1980-12-01), Gentaku

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