Water Treatment and Industrial Residues for Soil P Binding
Abstract:Nutrient inactivation as a component of stormwater treatment, and lake restoration has been used for over thirty years. Binding of soluble soil phosphorus into a form that is not bioavailable can be an essential part of watershed management. Algae have no roots and thus require all nutrients to be soluble. The difference between a eutrophic water and “pristine” water is as little as 30-ppb phosphorus–thus a small reduction in phosphorus loading can have a dramatic water quality impact.
Water treatment residues have significant P sorption capacity. Further they are mainly hydroxide of the metal salts used in treatment and provide buffering to the soil from the deleterious effects of soil acidulation. The water treatment residue can have significant impact in mitigating soluble P runoff from over fertilized (manure or biosolids) soils. WTR and other residues have also shown the ability to reduce runoff of heavy metals, organic carbon, and hormones from manure. A review of research and full-scale projects using water treatment residues to bind soil phosphorus and intercept P will be presented. Considerations for choosing which of the most common residues used for phosphorus binding will be discussed.
Document Type: Research Article
Publication date: January 1, 2003
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