A treatment wetland is an engineered sequence of water bodies designed to filter and treat waterborne pollutants found in storm water runoff or effluent.
In treatment wetlands aerobic and anaerobic biological processes can neutralize and capture most of the dissolved nutrients and toxic pollutants from the water, resulting in the discharge of clean water.
Many regulatory agencies list treatment wetlands as one of their recommended "best management practices" for controlling urban runoff. Treatment wetlands can also be used for sewage treatment.
Read more about this topic: Constructed Wetland
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—Plato (c. 427–347 B.C.)