UTILIZATION OF WATER TREATMENT RESIDUAL MATERIAL TO BIND INORGANIC PHOSPHORUS
The U.S. livestock industry in many states has large confined animal populations in limited geographic areas. This trend has resulted in a concentration of manure production and the possibility of over-application of manure to soils. Over-application of manure may result in an accumulation of soil phosphorus (P) much higher than crop P nutrient requirements. Incidental losses of P from fields with excess soil P concentrations into water bodies have raised environmental concerns about decreased water quality. P losses have been reduced from manure-treated fields using water treatment residual (WTR) material. Water treatment residual material consists of river sediments (silts and clays) that have been flocculated using alum [Al2(SO4)3] during drinking water purification processes. Alum-treated WTR material can effectively bind P because it contains Al-oxides. Our objective was to determine the inorganic-P sorption characteristics of WTR material and WTR material mixed with a Norfolk soil. The P sorption data were fitted to a Langmuir equation to determine P sorption maxima (Pmax) values. The WTR material had a high Pmax value of 215 mg P g−1. In contrast, the unamended Norfolk soil had a relatively low Pmax value of < 0.9 mg P kg−1. Adding WTR material to Norfolk soil at 5 and 10% (w/w) resulted in an increase in Pmax values to 5 and 8 mg P g−1, causing a 5- to 9-fold increase in the Pmax compared to unamended soil. These results imply that alum-treated WTR material can bind large amounts of inorganic-P and can be a useful amendment to increase the Norfolk soil's P sorption capacity.
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Document Type: Research Article
Publication date: 01 January 2003
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