Activated sludge process using downflow sludge blanket filtration
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United States of America Patent
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Feb 3, 2009
Grant Date -
Mar 24, 2005
app pub date -
Aug 27, 2004
filing date -
Sep 24, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to an activated sludge process and apparatus for effectively removing organic matters, nutrient salts, particulates, etc. dissolved in sewage/waste water by operating activated sludge process of a high biomass concentration combined with a down-flow solid-liquid separation process utilizing a float-concentrated sludge blanket layer. The present invention provides a process for biologically treating sewage/waste water using activated sludge, comprising the steps of (a) floating a sludge by having micro bubbles rise to form a float-concentrated sludge blanket layer and (b) down-flowing mixed liquor, including activated sludge and solids, into the sludge blanket layer, thereby resulting in a solid-liquid separation and an apparatus for operating the process.
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