Sewage treatment process

Details Sewage treatment process Sewage treatment process

1974-08-29

1976-04-27

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 16, 210 18, 210DIG27, C02C 510

Patent

active

039533271

ABSTRACT:
A sewage treatment process is especially applicable to sewage that has been supplied with methanol to undergo anoxic denitrification. During anoxic denitrification bacteria use the methanol for food while reducing nitrates and nitrites to nitrogen gas and other products. From such denitrification step the sewage is subjected to stabilization by aeration for a time, e.g. 50 minutes, during which some contained protozoans, e.g. ciliates and rotifers, multiply. From the stabilization by aeration step the material is subjected to a mildly aerated, physical conditioning step and then clarification step. Resulting sludge is recycled to the denitrification step and separated, relatively clear effluent is removed from the process.

REFERENCES:
patent: 3617540 (1971-11-01), Bishop et al.
patent: 3654147 (1972-04-01), Levin et al.
patent: 3709364 (1973-01-01), Savage
patent: 3817857 (1974-06-01), Torpey
patent: 3849303 (1974-11-01), Torpey
Climenhage D. C.; "Biological Denitrification of Nylon Intermediates Waste Water" 22nd Canadian Chemicals Engineering Conf. Sept. 17-20 (1972).
Parker et al.; "Full Scale Test Plant at Contra Costa Turns Out Valuable Data on Advanced Treatment" Bull. of the Calif. W.P.C.A. Vol. 9 No. 1 (July 1972).

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