title: Simultaneous waste activated sludge disintegration and biological hydrogen production using an ozone/ultrasound pretreatment.
abstract: This paper offers an effective pretreatment method that can simultaneously achieve excess sludge reduction and bio-hydrogen production from sludge self-fermentation. Batch tests demonstrated that the combinative use of ozone/ultrasound pretreatment had an advantage over the individual ozone and ultrasound pretreatments. The optimal condition (ozone dose of 0.158 g O(3)/g DS and ultrasound energy density of 1.423 W/mL) was recommended by response surface methodology. The maximum hydrogen yield was achieved at 9.28 mL H(2)/g DS under the optimal condition. According to the kinetic analysis, the highest hydrogen production rate (1.84 mL/h) was also obtained using combined pretreatment, which well fitted the predicted equation (the squared regression statistic was 0.9969). The disintegration degrees (DD) were limited to 19.57% and 46.10% in individual ozone and ultrasound pretreatments, while it reached up to 60.88% in combined pretreatment. The combined ozone/ultrasound pretreatment provides an ideal and environmental friendly solution to the problem of sludge disposal.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Yang
authors.forename: Wan-Qian
authors.initials: WQ
authors.lastname: Guo
authors.forename: Guang-Li
authors.initials: GL
authors.lastname: Cao
authors.forename: He-Shan
authors.initials: HS
authors.lastname: Zheng
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
mesh_terms: D006859:Hydrogen / Q000378:metabolism*; D010126:Ozone / Q000737:chemistry*; D012722:Sewage; D014465:Ultrasonics
chemical_list: D012722:Sewage; D010126:Ozone; D006859:Hydrogen