Waste water treatment using activated sludge process
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United States of America Patent
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-
Jul 8, 2003
Grant Date -
N/A
app pub date -
May 22, 2001
filing date -
Oct 6, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for controlling the retention time of the sludge undergoing clarification in a process for treating wastewater by activated sludge comprising a recirculation of the activated sludge from the clarification stage into the biological basins, characterized in that the rate of sludge recirculation (Q.sub.r) is varied so as to maintain a constant recirculated sludge concentration (C.sub.r) while at the same time guaranteeing a retention time (RT) of the sludge undergoing clarification of less than a critical value (RT.sub.max).
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