septic tank

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septic tank

n.
A sewage-disposal tank in which a continuous flow of waste material is decomposed by anaerobic bacteria.
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An Imhoff tank consists of two chambers placed one above the other with solids passing through an opening into the lower chamber.
espurgo the services of wastewater treatment plants and Imhoff tanks as further specified in Article.
Ever since Imhoff tanks were built in the 1920s, cities have pondered the possibility of making agricultural use of the sludge - biosolids - resulting from anaerobic digestion or other wastewater treatment processes.