Sewage-water purifying process
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United States of America Patent
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Mar 22, 1988
Grant Date -
N/A
app pub date -
Sep 11, 1986
filing date -
Sep 16, 1985
priority date (Note) -
Expired
status (Latency Note)
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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).
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