Activated sludge method

The activated sludge method is a widely used biological process for treating sewage and industrial wastewater. This method involves aerating wastewater to encourage the growth of microorganisms that consume organic pollutants. In this process, the wastewater first enters a primary sedimentation tank where large particles settle. The clarified water then flows into an aeration tank where it is mixed with _____ ___ ______ __________ _________ ________ ____ ______ ________.
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