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Activated Sludge Wastewater Treatment Plants

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Activated Sludge Wastewater Treatment Plants
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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.

1. INTRODUCTION
2. ACTIVATED SLUDGE PROCESSES
3. CLOSED-LOOP REACTOR DESIGN CRITERIA
4. EXAMPLE CALCULATIONS
5. REFERENCES
6. BIBLIOGRAPHY