DOI: 10.1016/j.watres.2018.08.027
Scopus记录号: 2-s2.0-85051799916
论文题名: In situ generation of zero valent iron for enhanced hydroxyl radical oxidation in an electrooxidation system for sewage sludge dewatering
作者: Hu S. ; Hu J. ; Liu B. ; Wang D. ; Wu L. ; Xiao K. ; Liang S. ; Hou H. ; Yang J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 162
结束页码: 171
语种: 英语
英文关键词: Electro-Fenton
; Electrolysis
; Electrooxidation
; Molecular oxygen activation
; Sewage sludge dewatering
; Zero valent iron
Scopus关键词: Chemical activation
; Dewatering
; Electrodes
; Electrolysis
; Electrooxidation
; Filtration
; Flocculation
; Hybrid systems
; Molecular oxygen
; Particle size
; Particle size analysis
; Sewage sludge
; Electro-fenton
; Electrochemical conditioning
; Extracellular polymeric substances
; Hydroxyl radical oxidations
; Oxygen activations
; Sludge dewatering
; Specific resistance to filtration
; Zero-valent iron
; Iron compounds
; hydrogen peroxide
; hydroxyl radical
; iron
; oxygen
; activated carbon
; activation energy
; dewatering
; electrochemistry
; electrode
; filtration
; flocculation
; hydroxyl radical
; iron nanoparticle
; oxidation
; physicochemical property
; polymer
; sludge
; Article
; controlled study
; cyclic potentiometry
; degradation
; electric potential
; electron spin resonance
; energy consumption
; Fenton reaction
; filtration
; hydrogen evolution
; isoelectric point
; oxidation
; oxidation reduction potential
; oxygen evolution
; particle size
; pH
; polymerization
; priority journal
; scanning electron microscopy
; sludge conditioning
; sludge dewatering
; spectrofluorometry
; surface charge
; viscosity
; water content
; X ray diffraction
; zeta potential
英文摘要: A hybrid electrochemical conditioning strategy for enhanced sewage sludge dewatering was proposed. A water content of 47.2 wt.% for the dewatered sludge cake was achieved at an applied voltage of 20 V for 30 min, which was significantly lower than previously reported results. The capillary suction time (CST) and specific resistance to filtration (SRF) were decreased by 75.6% and 90.9%, respectively. Four simultaneous processes, including electrooxidation, the electro-Fenton process, molecular oxygen activation via zero valent iron (ZVI) and Fe(III) flocculation, had synergetic effects on the degradation of extracellular polymeric substances (EPS) to enhance sludge dewaterability. The in situ generation of ZVI on the cathode electrode facilitated the reduction of Fe(III) to Fe(II) via activation of molecular oxygen. The sludge pH decreased spontaneously and remained acidic due to the competitive reaction of ZVI generation to hydrogen evolution as well as the Fe(III) flocculation process, which further guaranteed the high efficiency of hydroxyl radical generation. Changes in the physiochemical properties of the sludge (particle size distribution, zeta potential, viscosity and EPS characteristics) induced by the hybrid conditioning process were further explored. In addition, the economic potential of the hybrid system was preliminarily assessed (USD$ 127.6/ton dry sludge). © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112419
Appears in Collections: 气候减缓与适应
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作者单位: School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan, 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Wuhan, 430074, China
Recommended Citation:
Hu S.,Hu J.,Liu B.,et al. In situ generation of zero valent iron for enhanced hydroxyl radical oxidation in an electrooxidation system for sewage sludge dewatering[J]. Water Research,2018-01-01,145