Concentrations of Phosphorous, Magnesium and Calcium in Swine Wastewater and Possibility of Removing These Components through Crystallization

概要

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In order to confirm the possibility of crystallization of P, Mg and Ca in swine wastewater, the concentration of P, Mg and Ca in such wastewater was determined by estimation and measurement of real swine wastewater, and artificial induction of a crystallizing reaction was attempted in swine wastewater. Based on estimates of the material flow of P, Mg and Ca in the average swine husbandry system in Japan, the concentrations of P, Mg and Ca in swine wastewater were calculated as 11.3mmol/l, 6.2mmol/l and 10.2mmol/l, respectively, when 100% of feces excreted was mixed into urine and washing water. It was shown that real swine wastewater also includes P, Mg and Ca in high concentrations, and that a considerable portion of PO43-, Mg and Ca naturally exist as crystal in swine wastewater of relatively high pH (7.7-8.7). It was confirmed that artificial crystallization of soluble PO43-, Mg and Ca can be done by adding NaOH to swine wastewater. Moreover, it was clarified that crystal in swine wastewater does not redissolve if a high pH condition is maintained. Crystal can be removed easily by sedimentation because of its high density. An artificial crystallizing process will contribute to a scale-free purification system for swine wastewater.
社団法人日本畜産学会の論文
2001-01-01