title: Characterizing the fluorescent products of waste activated sludge in dissolved organic matter following ultrasound assisted ozone pretreatments.
abstract: This study investigated the effects of ozone and ultrasound (US) pretreatments, both individually and combined, on waste activated sludge reduction. Batch tests were conducted first to optimize the individual ozone and US pretreatments. Maximum sludge reduction ratios of 10.89% and 23% were obtained at 0.15g O3/g total solids ozone dose and 1.5W/mL US energy density, respectively. The combined ozone and US pretreatments were studied using response surface methodology. A maximum sludge reduction ratio of 40.14% was achieved by the combined ozone/US pretreatment with an ozone dose of 0.154g O3/g total solids and an US energy density of 1.445W/mL. The analysis of the dissolved organic matter by three-dimensional excitation-emission matrix fluorescence spectroscopy showed that the combined pretreatment was superior to the individual ozone and US pretreatments, and also demonstrated the synergetic effect of these two combined pretreatments.
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
authors: Shan-Shan
authors: SS
authors: Yang
authors: Wan-Qian
authors: WQ
authors: Guo
authors: Zhao-Hui
authors: ZH
authors: Meng
authors: Xian-Jiao
authors: XJ
authors: Zhou
authors: Xiao-Chi
authors: XC
authors: Feng
authors: He-Shan
authors: HS
authors: Zheng
authors: Bo
authors: B
authors: Liu
authors: Nan-Qi
authors: NQ
authors: Ren
authors: Ya-Shan
authors: YS
authors: Cui
mesh_terms: D007220:Industrial Waste / Q000517:prevention & control*; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects*; D010126:Ozone / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D013010:Sonication / Q000379:methods*; D013050:Spectrometry, Fluorescence / Q000379:methods*
chemical_list: D007220:Industrial Waste; D009930:Organic Chemicals; D012722:Sewage; D010126:Ozone