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Cost Effective, Low Maintenance System to Achieve Total Phosphorus <0.5 mg/l

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Phosphorus is generally the limiting nutrient that controls eutrophication and water quality in freshwater bodies and in some estuarine areas. Coastal freshwater ponds in particular have phosphorus management challenges as the soils are typically sandy and have very limited, and reversible as the USGS has determined, capacity for phosphorus removal. Phosphorus contributions from on-site wastewater management systems is the cause of coastal pond accelerated eutrophication in many areas. There are limited small flow phosphorus treatment technologies available.

This paper discusses the mechanisms for phosphorus removal, in particular the PhosRIDTM (Reductive Iron Dissolution) Technology, which relies upon mineralization of dissolved phosphorus and dissolved iron to vivianite and strengite through the production of ferrous iron in an anaerobic RID reactor and conversion of the ferrous iron to ferric iron in the second stage oxidative step of the RID process, which then enables the mineralization of phosphate and ferric to strengite. Performance summaries for projects that have utilized the PhosRID™ Phosphorus Removal Technology are included in this paper.
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Document Type: Research Article

Publication date: 01 January 2008

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