Activated sludge method

The activated sludge method is a widely used biological process for treating sewage and industrial wastewater. It involves aerating wastewater to encourage the growth of microorganisms that consume organic pollutants. In this method, wastewater is first passed through a primary treatment process to remove large solids. The remaining liquid then enters an aeration tank, where it is mixed with _____ _______ _________ _______ _________ ________.
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