Method of separating a suspension of activated sludge and sewage water
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United States of America Patent
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Aug 14, 1990
Grant Date -
N/A
app pub date -
Mar 29, 1989
filing date -
Apr 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sedimentation tank for separating activated sludge from a suspension of activated sludge and sewage water, with an intake (11) for the suspension, an outlet (3) for the activated sludge at the conical bottom, and a discharge (4) at the top for the sewage water that the activated sludge has been eliminated from. A pipe (7) that is open at the top and closed at the bottom by a floor (9) is accommodated at the center of the tank and an inlet (10) that communicates with the intake opens into the pipe in the vicinity of the floor. The central pipe extends above the surface (20) of the liquid in the tank, which is dictated by how much is leaving, is loosely surrounded by another pipe (8) that extends above and below the surface of the liquid, and accommodates an agitator (12) with a speed that can be set to shape the suspension at the top of the pipe into a paraboloid (21) of rotation, which extends to the edge and from which the suspension spills over the edge.
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