Biological Phosphorus Removal Using a Fixed and Suspended Growth Combination: A First Year Appraisal

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by Harlan G. Kelly, Dayton & Knight Ltd, Canada,
Allan Gibb, Dayton & Knight Ltd, Canada,

Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract: As an alternative to the activated sludge process for biological phosphorus removal, this paper discusses an alternative which avoids high costs of air supply and large suspended growth tankage, a combination of fixed growth reactors (trickling filters) and suspended growth reactors was developed. The combination is believed to provide an improved environment for the biological phosphorus, carbonaceous, and nitrifying microorganisms. The 1.2 mgd treatment plant in Salmon Arm, British Columbia, Canada, has operated for almost one year in either of two modes of the four possible modes of plant operation. Examination of effluent concentrations of BOD5, suspended solids (SS), phosphorus and ammonia nitrogen has been undertaken during this time, and results are discussed.

Subject Headings: Phosphorus | Biological processes | Turbidity | Waste treatment | Sewage | Microbes | Filters | Activated sludge | North America | Canada | British Columbia

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