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An Introduction to Activated Sludge Wastewater Treatment Plants

J. Paul Guyer, P.E., R.A., Fellow ASCE, Fellow AEI

This course provides an introduction to activated sludge wastewater treatment plants. In a conventional (plug-flow) activated sludge plant, the primary-treated wastewater and acclimated micro-organisms (activated sludge or biomass) are aerated in a basin or tank. After a sufficient aeration period, the flocculent activated sludge solids are separated from the wastewater in a secondary clarifier. The clarified wastewater flows forward for further treatment or discharge. A portion of the clarifier underflow sludge is returned to the aeration basin for mixing with the primary- treated influent to the basin and the remaining sludge is wasted to the sludge handling portion of the treatment plant.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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