Method and apparatus for increasing sludge concentration in water purification installations
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United States of America Patent
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Mar 24, 1992
Issued Date -
N/A
app pub date -
Sep 21, 1990
filing date -
Sep 24, 1987
priority date (Note) -
Expired
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Abstract
A method of treating water with activated sludge, comprising a process for depolluting said water including a stage in which carbon pollution is oxidized, a nitrification stage which may optionally be associated with a denitrification state and/or a dephosphating stage, and a sludge ageing process. The method further includes a sludge concentration stage, said stage being performed upstream from the sludge ageing stage, said concentration being performed by phase separation using compressed air, e.g. in a flotation tank (3), and the concentrated sludge being recycled via the sludge ageing stage.
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