Phosphate recovery as hydroxyapatite from nitrified UASB effluent at neutral pH in a CSTR

作者: A. Monballiu , E. Desmidt , K. Ghyselbrecht , B. Meesschaert

DOI: 10.1016/J.JECE.2018.06.052

关键词:

摘要: Abstract The wastewater of the potato processing industry is typically rich in phosphorus. effluent a UASB processor was nitrified prior to phosphate recovery as hydroxyapatite. nitrification ammonium not only removes which avoids competing struvite formation but also consumes double equimolar amount dissolved inorganic carbon. latter reduces calcium bicarbonate inhibition and carbonate precipitation makes available for precipitation. After this biological pre-treatment precipitated hydroxyapatite (Ca5(PO4)3OH) at neutral pH values (7.83) laboratory CSTR. This consumed part carbon that remained after final yield determined by Ca2+ ions. Both higher (8.5–10.5) low [Ca2+]/[P] ratio initiate coprecipitation carbonates magnesium phosphate. A conventional downstream facilitates salt. removal route presented an alternative currently applied process.

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