Method for magnetically filtering wastewaters containing oil-coa

Details Method for magnetically filtering wastewaters containing oil-coa Method for magnetically filtering wastewaters containing oil-coa

1998-01-21

1999-11-23

Savage, Matthew O.

Liquid purification or separation

Processes

Using magnetic force

210741, 210795, 210796, B01D 3506

Patent

active

059894350

ABSTRACT:
Electro-magnetic filter apparatus and method of operating to separate and remove oily magnetic solids from wastewaters. The filter apparatus includes a filter assembly having an electro-magnetic coil that encircles a canister. The canister has an interior space defined by a wall surface and a first perforated baffle spaced apart from a second perforated baffle. The interior space contains a ferromagnetic matrix comprising split ring lock washers. The feed side end portion of the canister communicates with the wastewater source that contains the oily magnetic solids, a wash-water supply, a pressurized air supply and a disposal stream. The discharge side end portion of the canister communicates with a recycling stream, the disposal stream and the wash-water supply. A feed side valve arrangement selectively introduces the wastewater into the feed side end portion of the canister during filtering operations, and selectively injects a pressurized air/wash-water mixture from the wash-water and pressurized air supply into the feed side end portion of the matrix canister during up-flow backwashing operations. The ferromagnetic matrix is fluidized by the pressurized air/wash-water mixture the during the up-flow backwashing. A discharge side valve arrangement selectively discharges clean effluent through the recycling stream during filtering or introduces water, from the wash-water supply, into the discharge end portion of the matrix canister during down-flow backwashing.

REFERENCES:
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patent: 3581895 (1971-06-01), Howard
patent: 4087358 (1978-05-01), Odor
patent: 4495074 (1985-01-01), Hagiwara et al.
patent: 4594160 (1986-06-01), Heitmann et al.
patent: 4784758 (1988-11-01), Willis
patent: 5019272 (1991-05-01), Kurahashi et al.

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