title: Advanced treatment of swine wastewater using an agent synthesized from amorphous silica and hydrated lime.
abstract: Advanced treatment using an agent synthesized from amorphous silica and hydrated lime (M-CSH-lime) was developed and applied to swine wastewater treatment. Biologically treated wastewater and M-CSH-lime (approximately 6 w/v% slurry) were fed continuously into a column-shaped reactor from its bottom. Accumulated M-CSH-lime gradually formed a bed layer. The influent permeated this layer and contacted the M-CSH-lime, and the treatment reaction progressed. Treated liquid overflowing from the top of the reactor was neutralized with CO₂gas bubbling. The colour removal rate approximately exceeded 50% with M-CSH-lime addition rates of > 0.15 w/v%. The removal rate of PO(3⁻)(4) exceeded 80% with the addition of>0.03 w/v% of M-CSH-lime. The removal rates of coliform bacteria and Escherichia coli exceeded 99.9% with > 0.1 w/v%. Accumulated M-CSH-lime in the reactor was periodically withdrawn from the upper part of the bed layer. The content of citric-acid-soluble P₂O₅ in the recovered matter was>15% when the weight ratio of influent PO(3⁻)(4) -P to added M-CSH-lime was > 0.15. This content was comparable with commercial phosphorus fertilizer. The inhibitory effect of recovered M-CSH-lime on germination and growth of leafy vegetable komatsuna (Brassica rapa var. perviridis) was evaluated by an experiment using the Neubauer's pot. The recovered M-CSH-lime had no negative effect on germination and growth. These results suggest that advanced water treatment with M-CSH-lime was effective for simultaneous removal of colour, [Formula: see text] and coliform bacteria at an addition rate of 0.03-0.15 w/v%, and that the recovered M-CSH-lime would be suitable as phosphorus fertilizer.
authors.affiliation: a National Institute of Livestock and Grassland Science , Ibaraki , Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Teruaki
authors.initials: T
authors.lastname: Hasegawa
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Keiichi
authors.initials: K
authors.lastname: Miura
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Aketo
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Minowa
authors.forename: Masaya
authors.initials: M
authors.lastname: Toda
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kinoshita
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Akifumi
authors.initials: A
authors.lastname: Ogino
mesh_terms: D000818:Animals; D029741:Brassica rapa / Q000187:drug effects / Q000254:growth & development; D017610:Calcium Compounds / Q000737:chemistry* / Q000633:toxicity; D003116:Color; D004755:Enterobacteriaceae / Q000302:isolation & purification; D005308:Fertilizers / Q000633:toxicity; D018525:Germination / Q000187:drug effects; D019216:Metals, Heavy / Q000032:analysis; D010087:Oxides / Q000737:chemistry* / Q000633:toxicity; D010710:Phosphates / Q000032:analysis; D012822:Silicon Dioxide / Q000737:chemistry* / Q000633:toxicity; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater; D014873:Water Pollutants / Q000032:analysis
chemical_list: D017610:Calcium Compounds; D005308:Fertilizers; D019216:Metals, Heavy; D010087:Oxides; D010710:Phosphates; D012822:Silicon Dioxide; D062065:Wastewater; D014873:Water Pollutants; C016538:lime
keywords: amorphous calcium silicate hydrate; coliform removal; colour removal; phosphorus removal; swine wastewater