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Phosphate Removal at Baltimore, Maryland

1969; American Society of Civil Engineers; Volume: 95; Issue: 5 Linguagem: Inglês

10.1061/jsedai.0001005

2690-3350

Marion R. Scalf, Fred M. Pfeffer, Lawrence D. Lively, Jack L. Witherow, Charles P. Priesing,

Wastewater Treatment and Nitrogen Removal

The removal of phosphate by activated sludge at Baltimore, Maryland, was a function of mixed liquor dissolved oxygen concentration, BOD loading, and soluble phosphorus loading. Plant research demonstrated greater than 90% soluble phosphorus removal coinciding with plug flow conditions in the aeration tanks and high dissolved oxygen concentrations in the mixed liquor and final clarifiers. Pilot studies using aerated jugs of mixed liquor containing plant return sludge and primary effluent predicted the response of the plant activated sludge process. Pilot study revealed that 1,200 mg per l is the minimum mixed liquor suspended soilds concentration resulting in over 99% phosphate removal at Baltimore. Using mixed liquor suspended solids concentrations similar to plant conditions, pilot investigations showed that: (1) Increased orthophosphate load required greater aeration time for phosphate removal; (2) increased BOD load resulted in higher initial phosphate concentrations; and (3) increased aeration rates resulted in less time required for phosphate removal.