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Extraction of Soluble Phosphorus from Swine Wastewater

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  024098,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10489) @2002
Authors:   Matias B. Vanotti, Ariel A. Szogi, Patrick G. Hunt
Keywords:   Phosphorus removal, animal waste treatment, swine wastewater, N/P ratio, pathogens, CAFO, manure P, hog lagoons, sprayfield remediation

Manure phosphorus (P) in excess of the assimilative capacity of land available on farms is an environmental concern often associated with confined livestock production. A wastewater treatment process was developed for removal of phosphorus from livestock wastewater. It includes nitrification of wastewater and increasing the pH of the nitrified wastewater by adding an alkaline earth metal-containing compound to precipitate phosphorus to form an effluent having a specified nitrogen:phosphorus ratio that is useful as a balanced fertilizer or a low P fertilizer for remediation of contaminated soils. The presence of infectious microorganisms is reduced in the useable effluent. The precipitated phosphorus is recovered in a marketable form.

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