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Continuous Backwash Filters: An Attractive Technology for Phosphorus Removal and Recovery, and Nitrate Reduction

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Abstract:

Continuous backwash filters (CBFs) have been widely applied for suspended solids and nutrient removal. A more recent development is the use of a reactive media, namely hydrous ferric oxide coated silica sand in CBFs, to achieve effluent total phosphorus (TP) levels less than 0.1 mg/l. The results from case studies involving the use of a commercial embodiment of the reactive filtration technology, demonstrate the ability to achieve an effluent TP level of 10 μg/l in the treatment of municipal wastewater secondary effluent. The reactive filtration technology appears to be well suited as the means to achieve phosphorus removal and recovery in a new flowsheet designed to achieve energy sustainability, and water and nutrient recovery.

A mathematical model was developed for the reactive filtration, phosphorus removal technology. The observed results from case studies were in general agreement with the model predictions. A model was also developed for application of a tertiary treatment CBF system for nitrate removal. Observed results derived from various locations where the denitrification CBF system was in operation generally agreed with the model values.

Keywords: Nutrient removal; continuous backwash filters; mathematical modeling

Document Type: Research Article

DOI: https://doi.org/10.2175/193864709793901455

Publication date: 2009-01-01

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