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[[File:RC Harris Water Treatment Plant 2009.jpg|thumb|RC Harris Water Treatment Plant 2009]]
==What is it?==
==What is it?==
Water Treatment Residuals (WTR) are primarily sediment, metal (alumunium, iron, or calcium) oxide/hydroxides, activated carbon, and lime removed from raw water during the water purification process. The effectiveness of WTR in reducing soluble phosphorus depends on several factors, including source water characteristics, water treatment methods, and length of residual storage time prior to land application. Different water treatment facilities create different physical and chemical compositions and phosphorus sorption capability of WTR.<ref name=Agyin>Agyin-Birikorang S, O’Connor G, Obreza T. Drinking Water Treatment Residuals to Control Phosphorus in Soils. UF/IFAS Extension. 2016.</ref>
Water Treatment Residuals (WTR) are primarily sediment, metal (alumunium, iron, or calcium) oxide/hydroxides, activated carbon, and lime removed from raw water during the water purification process. The effectiveness of WTR in reducing soluble phosphorus depends on several factors, including source water characteristics, water treatment methods, and length of residual storage time prior to land application. Different water treatment facilities create different physical and chemical compositions and phosphorus sorption capability of WTR.<ref name=Agyin>Agyin-Birikorang S, O’Connor G, Obreza T. Drinking Water Treatment Residuals to Control Phosphorus in Soils. UF/IFAS Extension. 2016.</ref>