Process for treating wastewater

Details Process for treating wastewater Process for treating wastewater

1989-11-28

1991-03-12

Silverman, Stanley

Liquid purification or separation

Processes

Treatment by living organism

210615, 210624, 210625, 210903, 210906, C02F 330

Patent

active

049991116

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. The soluble substrates are mixed with the return activated sludge and held for a selected time period in an anoxic zone, to form conditioned, denitrified return activated sludge, followed by anaerobic treatment, to produce microorganisms that are capable of biologically removing phosphorus. 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 pretreated wastewater may be conveyed through a series of treatment zones, which may include at least one anoxic treatment zone.

REFERENCES:
patent: 2391494 (1945-12-01), Walker
patent: 2517792 (1950-08-01), Kraus
patent: 3220706 (1965-11-01), Valdespino
patent: 3300402 (1967-01-01), Grich et al.
patent: 3654147 (1972-04-01), Levin et al.
patent: 4487697 (1984-12-01), Bohnke et al.
patent: 4874519 (1989-10-01), Williams

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