title: Simultaneous removal of colour, phosphorus and disinfection from treated wastewater using an agent synthesized from amorphous silica and hydrated lime.
abstract: An agent synthesized from amorphous silica and hydrated lime (CSH-lime) was investigated for its ability to simultaneously remove the colour, phosphorus and disinfection from the effluents from wastewater treatment plants on swine farms. CSH-lime removed the colour and phosphate from the effluents, with the colour-removal effects especially high at pH 12, and phosphorous removal was more effective in strongly alkaline conditions (pH > 10). Colour decreased from 432 +/-111 (mean +/- SD) to 107 +/- 41 colour units and PO4(3-)P was reduced from 45 +/- 39 mg/L to undetectable levels at the CSH-lime dose of 2.0% w/v. Moreover, CSH-lime reduced the total organic carbon from 99.0 to 37.9 mg/L at the dose of 2.0% w/v and was effective at inactivating total heterotrophic and coliform bacteria. However, CSH-lime did not remove nitrogen compounds such as nitrite, nitrate and ammonium. Colour was also removed from dye solutions by CSH-lime, at the same dose.
authors.affiliation: NARO Institute of Livestock and Grassland Science, Ibaraki, Japan. yamatktk@affrc.go.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Aketo
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Minowa
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Akifumi
authors.initials: A
authors.lastname: Ogino
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tanaka
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D003116:Color; D004203:Disinfection / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry / Q000302:isolation & purification*; D012822:Silicon Dioxide / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis / Q000737:chemistry* / Q000382:microbiology*; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D010758:Phosphorus; D012822:Silicon Dioxide; D062065:Wastewater; D014867:Water; C016538:lime