Sewage-water purifying process

Details Sewage-water purifying process Sewage-water purifying process

1986-09-11

1988-03-22

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210630, 210631, 210903, C02F 330

Patent

active

047326794

ABSTRACT:
A water purifying method, particularly a sewage purification method, for eliminating nitrogen therefrom, in which (a) the water is subjected to a preprecipitation process with the aid of trivalent and/or multivalent metal salts for prereduction of incoming contaminants; (b) the NO.sub.3 present is reduced to nitrogen gas by anaerobic fermentation, in which readily decomposed organic material serves as the carbon source and gives by preprecipitation according to (a) an optimum nitrogen reduction in respect of each sewage category; (c) the ingoing ammonium nitrogen is oxidized to nitrate by aerobic fermentation while simultaneously blowing-off nitrogen-gas bound to the water, wherein water (sewage) that contains nitrate is passed to the reduction stage (b) and bacteria-containing sludge is passed from the aerobic stage to the anaerobic stage, and wherein process stages (b) and (c) can be carried out in any desired order subsequent to step (a).

REFERENCES:
patent: 4183809 (1980-01-01), Klapwijk et al.
patent: 4290884 (1981-09-01), Mandt
patent: 4384956 (1983-05-01), Mulder
patent: 4559142 (1985-12-01), Morper

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