title: Removal and recovery of phosphorous from swine wastewater by demonstration crystallization reactor and struvite accumulation device.
abstract: A demonstration crystallization reactor and struvite accumulation device for the removal and recovery of phosphorous was constructed and their performance was evaluated using actual swine wastewater for 3.5 years. The wastewater pH was increased by aeration, and the concentrations of total P and soluble PO(4)-P were reduced by a struvite crystallization reaction induced under a high pH condition. A 30% MgCl(2) addition was effective in enhancing the struvite crystallization reaction. The concentrations of suspended solids, total Zn and total Cu, were also decreased by the settling function of the reactor. On removing the efficiencies of these components, no noticeable seasonal fluctuation in performance was observed during the 3.5-year operation. In terms of maximum yield, 171g struvite was obtained from 1m(3) swine wastewater by the demonstration accumulation device for struvite recovery. The recovered struvite needed only air-drying before use since it was approximately 95% pure even without washing.
authors.affiliation: Pollution Control Research Team, National Institute of Livestock and Grassland Science (NILGS), 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan. szkazu@affrc.go.jp
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Suzuki
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kuroda
authors.forename: Dai
authors.initials: D
authors.lastname: Hanajima
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Fukumoto
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yasuda
authors.forename: Miyoko
authors.initials: M
authors.lastname: Waki
mesh_terms: D000818:Animals; D003460:Crystallization; D007564:Japan; D017616:Magnesium Compounds / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis; D010710:Phosphates / Q000737:chemistry*; D010758:Phosphorus / Q000302:isolation & purification*; D000069877:Struvite; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D017616:Magnesium Compounds; D019216:Metals, Heavy; D010710:Phosphates; D010758:Phosphorus; D000069877:Struvite