title: Advanced treatment technique for swine wastewater using two agents: Thermally polymerized amorphous silica and hydrated lime for color and phosphorus removal and sulfur for nitrogen removal.
abstract: The efficacy of advanced treatment of swine wastewater using thermally polymerized, modified amorphous silica and hydrated lime (M-CSH-lime) for color and phosphorus removal and sulfur for nitrogen removal was examined with a demonstration-scale treatment plant. The color removal rate was approximately 78% at M-CSH-lime addition rates of > 0.055 wt/v%. The PO43--P removal rate exceeded 99.9% with > 0.023 wt/v%. pH of the effluent from the M-CSH-lime reactor increased with the addition rate till a maximum value of 12.7, which was effective in disinfection. The recovered M-CSH-lime would be suitable as a phosphorus fertilizer because the total P2O5content was approximately 10%. The nitrogen oxide (NOx-N) removal rate by sulfur denitrification increased to approximately 80% when the NOx-N loading rate was around 0.1 kg-N/ton-S/day. It was suggested that the combination of the two processes would be effective in the advanced treatment of swine wastewater.
authors.affiliation: Chiba Livestock Research Center, Yachimata, Japan.|Kitasato University School of Veterinary Medicine, Towada, Japan.
authors.forename: Teruaki
authors.initials: T
authors.lastname: Hasegawa
authors.affiliation: Kitasato University School of Veterinary Medicine, Towada, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Kurose
authors.affiliation: National Institute of Livestock and Grassland Science, Tsukuba, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D019149:Bioreactors; D017610:Calcium Compounds; D003116:Color; D058440:Denitrification; D004203:Disinfection; D005308:Fertilizers; D009584:Nitrogen / Q000302:isolation & purification*; D009589:Nitrogen Oxides / Q000302:isolation & purification; D010087:Oxides; D010758:Phosphorus / Q000302:isolation & purification*; D058105:Polymerization; D012822:Silicon Dioxide; D013455:Sulfur / Q000302:isolation & purification*; D013552:Swine; D062065:Wastewater / Q000737:chemistry*; D014876:Water Pollution / Q000517:prevention & control; D018508:Water Purification / Q000379:methods*
chemical_list: D017610:Calcium Compounds; D005308:Fertilizers; D009584:Nitrogen; D009589:Nitrogen Oxides; D010087:Oxides; D010758:Phosphorus; D012822:Silicon Dioxide; D013455:Sulfur; D062065:Wastewater; C016538:lime
keywords: amorphous silica and hydrated lime; color removal; phosphorus removal; sulfur denitrification; swine wastewater