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sedimentation tank

noun
1.
a tank into which sewage is passed to allow suspended solid matter to separate out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for sedimentation tank

component of a modern sewage-treatment system. In a large metropolitan system, waste water is passed through a series of tanks following coarse screening to remove large objects. Grit chambers settle out sand and cinders; primary settling tanks remove heavy organic solids; and aeration tanks mix the incoming sewage with activated, bacteria-rich sludge and fine air bubbles, causing the rapid oxidation of organic matter. Final settling tanks remove the remaining suspended solids from the mixture.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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