Process for treating wastewater

Details Process for treating wastewater Process for treating wastewater

1989-08-04

1991-06-11

Silverman, Stanley

Liquid purification or separation

Processes

Treatment by living organism

210615, 210624, 210625, 210903, 210906, B01D 330

Patent

active

050229931

ABSTRACT:
The present invention entails a process for treating wastewater utilizing a return activated sludge process. Primary sludge is separated from the wastewater stream and conveyed into a fermentation tank and held a sufficient time to permit hydrolysis of suspended solids so as to produce soluble substrates. Part of the soluble substrates are mixed with nutrified return activated sludge and held for a selected time period to form conditioned return activated sludge. Thereafter, the conditioned return activated sludge is mixed in an initial aerobic treatment zone with pretreated wastewater. Thereafter, the mixed conditioned return activated sludge and pretreatd wastewater is conveyed through a series of treatment zones, which includes at least one anoxic treatment zone, to which part of the soluble substrates are added, where nitrogen and other pollutants are removed from the wastewater.

REFERENCES:
patent: 2517792 (1950-08-01), Kraus
patent: 3300402 (1967-01-01), Grich et al.
patent: 3654147 (1972-04-01), Levin et al.
patent: 3930998 (1976-01-01), Knopp et al.
patent: 4141822 (1979-02-01), Levin et al.
patent: 4267038 (1981-05-01), Thompson
patent: 4487697 (1984-12-01), Bohnke et al.
patent: 4664804 (1987-05-01), Morper et al.
patent: 4874519 (1989-10-01), Williamson

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