Method and apparatus for clarifying liquid using a pulsating sludge bed and part of concentrated sludge
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Feb 20, 1991
filing date -
Feb 20, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a pulsating sludge bed clarifier especially for the treatment of low turbidity waters, which uses incline plates in the sludge bed and some recirculated sludge. The clarification is greatly enhanced by recirculating a relatively small part of the sludge concentrate to a reactor chamber used for the premixing of water to be treated and the coagulant. The small amount of recirculated sludge cuts down significantly on the polymer flocculant, which is the most expensive chemical in the process that is required to be used, and can also serve to improve the adsorption of colors and similar materials, increase the density of the sludge blanket, and improve the rate of throughput of the system.
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