Activated Sludge Selectors: Case Studies of New England Plants

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Detailed evaluations of selector operations were performed on five New England wastewater treatment facilities. Anaerobic, anoxic and aerobic selectors were included in the full-scale evaluations. Long-term operating data indicate that all three types of selectors, coupled with a plug-flow configured aeration basin, are capable of producing mixed liquor with a 95th percentile SVI of about 150 mL/g. Selectors in appropriately designed and operated compartmentalized reactors appear capable of producing 95th percentile SVIs of less than 125 mL/g. SVIs from the five plants averaged 70 to 110 mL/g. Clarifier surface areas can be reduced by 20 to 50 percent compared to non-selector plants.
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