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Phosphorus additions to agricultural land from animal manure, biosolids or commercial fertilizer, in excess of crop requirements can cause degradation of surface water quality. Drinking Water treatment residuals (WTR) have been shown to be effective phosphorus (P) sorbents. Researchers at Oklahoma State University have proposed the use of WTR as a best management practice (BMP) to reduce P loss from agricultural land. The objective of this work is to refine our ability to estimate the WTR P sorption capacity in order to provide decision-makers and utilities with a tool to calibrate WTR application rates. Previous work identified Al-oxides as strongly related to WTR P sorption. However short term batch equilibration underestimated P sorption capacity. An improved method to estimate P sorption capacity that is consistent with the time dependent P loss chemical processes will be presented. Estimating WTR performance as a P sorbent is important to effectively reduce risk of environmental degradation and to calibrate application.
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Document Type: Research Article

Publication date: 2003-01-01

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