Method for treating plant effluent

Details Method for treating plant effluent Method for treating plant effluent

1984-10-22

1986-09-02

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210612, 210631, C02F 328

Patent

active

046094695

ABSTRACT:
A method for improving the waste treatment of industrial bakery plant effluent by taking clarified effluent which has been subjected to pH changes to form sludge in a primary clarifier, removing said effluent from the initial sludge in the clarifier, and circulating it after sludge separation therefrom into a series of three underground tanks where a solution of activated anaerobic bacteria is metered. The residence time, for the effluent and bacteria in said tanks is 48 to 72 hours at a temperature of 28.degree. C. to 48.degree. C. Thereafter, the treated effluent is recirculated once again to a lower clarifier which feeds any sludge formed into a sludge concentration tank, while the aqueous effluent remaining is further processed in a sand filter, an ozonator, and a reverse osmosis unit to achieve a BOD level of below 150 (mg/l) and a COD level of below 80 (mg/l).

REFERENCES:
patent: 3847803 (1974-11-01), Fisk
patent: 4067801 (1978-01-01), Ishida et al.
patent: 4173532 (1979-11-01), Keoteklian
patent: 4293421 (1981-10-01), Green
patent: 4297216 (1981-10-01), Ishida et al.

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