Transcription of How Wastewater Treatment WorksThe Basics
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How Wastewater Treatment WorksThe Basics
United StatesEPA 833-F-98-002 Environmental Protection May 1998 AgencyOffice of Water (4204) BasicsOne of the most common forms of pollutioncontrol in the United States is wastewatertreatment. The country has a vast system ofcollection sewers, pumping stations, and treatmentplants. Sewers collect the Wastewater from homes,businesses, and many industries, and deliver it toplants for Treatment . Most Treatment plants werebuilt to clean Wastewater for discharge into streamsor other receiving waters, or for ago, when sewage was dumped intowaterways, a natural process of purification , the sheer volume of clean water in the streamdiluted wastes.
laden with bacteria into close contact with sewage. After the sewage leaves the settling tank in the primary stage, it is pumped into an aeration tank, where it is mixed with air and sludge loaded with bacteria and allowed to remain for several hours. During this time, the bacteria break down the organic matter into harmless by-products.
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