Sewage-water purifying process

Details Sewage-water purifying process Sewage-water purifying process

C - Chemistry, Metallurgy

02

F

362/4

C02F 3/30 (2006.01) C02F 3/12 (2006.01)

Patent

CA 1298418

ABSTRACT OF THE DISCLOSURE A water purifying method, particularly a sewage purification method, for elimi- nating nitrogen therefrom, in which a) the water is subjected to a preprecipitation process with the aid of triva- lent and/or multivalent metal salts for prereduction of incoming contami- nants; b) the NO3 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 reduc- tion in respect of each sewage category; c) the ingoing ammonium nitrogen is oxidized to nitrate by aerobic fermen- tation 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).

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