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

• Published in: Nihon Yoton Gakkaishi Vol. 49; no. 3; pp. 117 - 127
• Main Authors: KAWAMURA, Eisuke, TANABE, Makoto, TAKADA, Hiroshi, MUROTA, Yoshiaki, SHIROISI, Akihiko, TAKAYANAGI, Norihiro, TURUHASHI, Toru, SUZUKI, Kazuyoshi, NISHIMURA, Osamu
• Format: Journal Article
• Language: Japanese
• Published: The Japanese Society of Swine Science 28.09.2012
• Subjects: feces-and-urine-separated swine wastewater; solid/liquid separator; struvite; struvite accumulation device
• ISSN: 0913-882X; 1881-655X
• DOI: 10.5938/youton.49.117

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.