Apparatus and process for treatment of sludge

Details Apparatus and process for treatment of sludge Apparatus and process for treatment of sludge

1980-10-31

1982-09-21

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

134 13, 156642, 210712, 210724, 210726, 210751, 210772, 210901, 210912, 210913, C02F 152

Patent

active

043505970

ABSTRACT:
An apparatus and a process are provided which are particularly suited for treatment of sludge eminating from a metal finishing solution regeneration process, especially aluminum finishing solution. The sludge is washed on a horizontal belt vacuum filter from which a majority of the washing fluid is returned to the regeneration process. A portion of the washing water is wasted. After washing, the sludge is reslurried. Thereafter, the reslurried sludge is pumped to a reaction vessel in the presence of carbon dioxide under pressure. Sufficient carbon dioxide is provided to react with excess lime in the sludge to produce calcium carbonate and a substantially neutral pH. The sludge after carbonation is dewatered in a rotary drum vacuum filter and thereafter is suitable for placement in a landfill.

REFERENCES:
patent: 2132585 (1938-10-01), Spittle
patent: 3345288 (1967-10-01), Sontheimer
patent: 3486954 (1969-12-01), Ashcraft
patent: 3607482 (1971-09-01), Selm
patent: 3712838 (1973-01-01), Weissenberg
patent: 3943233 (1976-03-01), Swanson et al.
patent: 4017343 (1977-04-01), Haas
patent: 4044106 (1977-08-01), Fang
patent: 4136026 (1979-01-01), Meyer
patent: 4176160 (1979-11-01), Pavonet
patent: 4289616 (1981-09-01), Hallack et al.

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