Process for the secondary treatment of wastewater

Details Process for the secondary treatment of wastewater Process for the secondary treatment of wastewater

1979-02-26

1983-02-15

Therkorn, Ernest G.

Liquid purification or separation

Processes

Treatment by living organism

210610, 210627, 210629, 162 29, C02F 312

Patent

active

043740278

ABSTRACT:
A process for the secondary treatment of wastewater by a modified air activated sludge system comprising aerating wastewater containing bacteria until the BOD level of the wastewater is reduced by at least 90%, the food to microorganism ratio of the wastewater being greater than one, introducing the aerated wastewater under pressure to a flotation cell to separate suspended solids including bacteria from the pressurized wastewater by dissolved air flotation clarification, recycling said suspended soilds and bacteria to said aeration step in an amount sufficient to maintain said food to microorganism ratio and removing and disposing of the remaining reduced BOD level wastewater.

REFERENCES:
patent: 3236766 (1966-02-01), Levin
patent: 3264213 (1966-08-01), Pau
patent: 3356609 (1967-12-01), Bruemmer
patent: 3397140 (1968-08-01), Dea
patent: 3547814 (1970-12-01), McWhirter
patent: 3574331 (1971-04-01), Kurosawa
patent: 3576738 (1971-04-01), Duffy
patent: 3617539 (1971-11-01), Grutsch
patent: 3764524 (1973-10-01), Stankewick
patent: 3884803 (1975-05-01), Traylor
patent: 4069149 (1978-01-01), Jackson
patent: 4086160 (1978-04-01), Roesler
Deep Shaft Aeration Process for Effluent Treatment, Institute of Chemical Engineers, York, England, Apr. 16/17, 1975.
New Civil Engineer, B. Appleton, Apr. 17, 1975.
Metcalf and Eddy, Inc., Wastewater Engineering, McGraw-Hill, 1972, pp. 497-498.
Bacteria to Consume Waste in Revolutionary Treatment Plant of West Virginia Pulp and Paper Co., Southern Pulp and Paper Manufacturer, Aug. 10, 1954.

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