settling tank

noun
a tank for holding liquid until particles suspended in it settle.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

settling 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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Example sentences
The screened wastewater flows into a primary settling tank where it is held for
  several hours.
The spill resulted from an overflow of the ship's fuel oil settling tank during
  an internal fuel transfer.
The first tank flows into a second settling tank, allowing for additional
  settling.
Water used to wash potatoes and asparagus flows into a settling tank to allow
  dirt and debris to settle to the bottom of the tank.
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