Treatment of wastewater containing phosphorus compounds
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United States of America Patent
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-
Dec 18, 1984
Grant Date -
N/A
app pub date -
Mar 7, 1983
filing date -
Mar 7, 1983
priority date (Note) -
Expired
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Abstract
Wastewater containing phosphorus values and BOD is initially admixed with recycled sludge containing activated biomass under anaerobic conditions, then contacted with oxygen-containing gas, followed by separation of a dense sludge layer from the mixed liquor. A portion of the sludge layer, containing the activated biomass, is held under non-aeration conditions for sufficient time to reduce any nitrates and/or nitrites contained therein, before admixture of the recycled sludge with the wastewater influent.
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