![]() As the organisms feed on the organic pollutants in the wastewater, the pollutants are converted to more organisms known as biomass and some spin-offs. They do not need to be supplied from an outside source. ![]() This suspension, referred to as the mixed liquor or mixed liquor suspended solid, is supplied oxygen and kept mixed by bubbling air through the entire aeration tank. The activated sludge process relies on harvesting a population of millions of microorganisms with different characteristics – mostly aerobic, facultative and heterotrophic bacteria suspended in the wastewater – as the wastewater travels through a reactor known as an aeration tank.
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