Nitrogen and phosphorus removal from wastewater
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United States of America Patent
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Jun 11, 1985
Grant Date -
N/A
app pub date -
Mar 7, 1983
filing date -
Mar 7, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Wastewater is passed sequentially through an anaerobic treating zone and an oxic treating zone, followed by separation from the treated liquor of a dense sludge containing activated biomass, a least part of which is recycled to provide the activated biomass employed in treating the influent wastewater. Of the part of the sludge so recycled a minor portion is introduced into the anaerobic treating zone for admixture with the wastewater influent and the remaining major portion is introduced into the oxic treating zone, into which oxic zone oxygen-containing gas is admitted to effect oxygenation of the contents of that zone.
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