title: Feasibility of bioleaching combined with Fenton oxidation to improve sewage sludge dewaterability.
abstract: A novel joint method of bioleaching with Fenton oxidation was applied to condition sewage sludge. The specific resistance to filtration (SRF) and moisture of sludge cake (MSC) were adopted to evaluate the improvement of sludge dewaterability. After 2-day bioleaching, the sludge pH dropped to about 2.5 which satisfied the acidic condition for Fenton oxidation. Meanwhile, the SRF declined from 6.45×10(10) to 2.07×10(10) s2/g, and MSC decreased from 91.42% to 87.66%. The bioleached sludge was further conditioned with Fenton oxidation. From an economical point of view, the optimal dosages of H2O2 and Fe2+ were 0.12 and 0.036 mol/L, respectively, and the optimal reaction time was 60 min. Under optimal conditions, SRF, volatile solids reduction, and MSC were 3.43×10(8) s2/g, 36.93%, and 79.58%, respectively. The stability and settleability of sewage sludge were both improved significantly. Besides, the results indicated that bioleaching-Fenton oxidation was more efficient in dewatering the sewage sludge than traditional Fenton oxidation. The sludge conditioning mechanisms by bioleaching-Fenton oxidation might mainly include the flocculation effects and the releases of extracellular polymeric substances-bound water and intercellular water.
authors: School of Resources and Environmental Engineering, Panzhihua University, Panzhihua 617000, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: changwyx@163.com.
authors: Changgeng
authors: C
authors: Liu
authors: Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: zhangpanyue@hnu.edu.cn.
authors: Panyue
authors: P
authors: Zhang
authors: School of Resources and Environmental Engineering, Panzhihua University, Panzhihua 617000, China. Electronic address: zch1963111@sina.com.
authors: Chenghua
authors: C
authors: Zeng
authors: Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
authors: Guangming
authors: G
authors: Zeng
authors: School of Resources and Environmental Engineering, Panzhihua University, Panzhihua 617000, China.
authors: Guoyin
authors: G
authors: Xu
authors: School of Resources and Environmental Engineering, Panzhihua University, Panzhihua 617000, China.
authors: Yi
authors: Y
authors: Huang
mesh_terms: D003890:Desiccation; D005374:Filtration; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D012722:Sewage; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Bioleaching; Dewaterabilty; Fenton oxidation; Sewage sludge