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A holding tank, also called a waste water holding tank or black tank, is a container for storing sewage in vehicles equipped with toilets. Vehicles that employ holding tanks include recreational vehicles , trucks or lorries , railroad trains, boats, aircraft, and even spacecraft. The contents are emptied into a dump station, which discharges the raw sewage into a sewage treatment system.
Holding tank can also refer to a sealed, buried tank used to hold waste from a house or other building. Such a tank is referred to in the U.K. as a cesspit.A Holding Tank Sewage System is an alternative to a conventional on-site sewage system with very special and limited applications. Simply, the HTSS provides a means to collect and temporarily store sewage from a facility or dwelling, for subsequent removal and transport to an approved treatment and disposal site. The required storage capacity of a holding tank depends upon two items: daily sewage flow, and available or optimal pumping service frequency.