Recovery of Phosphorus from Feces-and-Urine-Separated Swine Wastewater with Struvite Accumulation Device

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  • 付着部材を利用したふん尿分離豚舎汚水からのリン回収

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CO2 stripping by aeration raised the pH of wastewater in a reactor, and a stainless steel device for accumulating struvite for recovery was submerged into the reactor. This device consisted of four mesh baskets having different heights and diameters. The feces-and-urine-separated swine wastewater and the swine wastewater treated by a solid/liquid separation swine wastewater (S/L SSW) were fed to the reactor. From the swine wastewater, the crystallization efficiency was 65%, and 8.2% crystallized P in the influent was recovered as struvite. From S/L SSW, the crystallization efficiency was 83%, and 26.7% crystallized P in the influent was recovered as struvite. For example, at a PO4-P surface load of 2kg/m2, 0.7-0.9kg/m2 of struvite was recovered from wastewater, whereas from S/L SSW 3kg/m2 of struvite was recovered. This is because the surface area of accumulation device was enlarged, and because the recovery efficiency was improved by the removal of Suspended Solids (SS) using the S/L separator and raising the pH improved recovery.

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 49 (3), 117-127, 2012

    The Japanese Society of Swine Science

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