title: Effects of natural organic matter on calcium and phosphorus co-precipitation.
abstract: Phosphorus (P), calcium (Ca) and natural organic matter (NOM) naturally occur in all aquatic ecosystems. However, excessive P loads can cause eutrophic or hyper-eutrophic conditions in these waters. As a result, P regulation is important for these impaired aquatic systems, and Ca-P co-precipitation is a vital mechanism of natural P removal in many alkaline systems, such as the Florida Everglades. The interaction of P, Ca, and NOM is also an important factor in lime softening and corrosion control, both critical processes of drinking water treatment. Determining the role of NOM in Ca-P co-precipitation is important for identifying mechanisms that may limit P removal in both natural and engineered systems. The main goal of this research is to assess the role of NOM in inhibiting Ca and P co-precipitation by: (1) measuring how Ca, NOM, and P concentrations affect NOM's potential inhibition of co-precipitation; (2) determining the effect of pH; and (3) evaluating the precipitated solids. Results showed that Ca-P co-precipitation occurs at pH 9.5 in the presence of high natural organic matter (NOM) (≈30 mg L(-1)). The supersaturation of calcite overcomes the inhibitory effect of NOM seen at lower pH values. Higher initial P concentrations lead to both higher P precipitation rates and densities of P on the calcite surface. The maximum surface density of co-precipitated P on the precipitated calcite surface increases with increasing NOM levels, suggesting that NOM does prevent the co-precipitation of Ca and P.
authors.affiliation: Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA. Electronic address: hugo.sindelar@msu.montana.edu.
authors.forename: Hugo R
authors.initials: HR
authors.lastname: Sindelar
authors.affiliation: Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.
authors.forename: Mark T
authors.initials: MT
authors.lastname: Brown
authors.affiliation: Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA. Electronic address: thboyer@ufl.edu.
authors.forename: Treavor H
authors.initials: TH
authors.lastname: Boyer
mesh_terms: D002118:Calcium / Q000302:isolation & purification*; D011232:Chemical Precipitation; D006812:Humic Substances / Q000032:analysis*; D008956:Models, Chemical; D010758:Phosphorus / Q000302:isolation & purification*; D013499:Surface Properties; D018508:Water Purification / Q000379:methods*; D014880:Water Softening
chemical_list: D006812:Humic Substances; D010758:Phosphorus; D002118:Calcium
keywords: Calcium; Co-precipitation; Natural organic matter; Phosphorus