DOI: 10.1016/j.watres.2017.11.060
Scopus记录号: 2-s2.0-85038017968
论文题名: Compartmentalization of extracellular polymeric substances (EPS) solubilization and cake microstructure in relation to wastewater sludge dewatering behavior assisted by horizontal electric field: Effect of operating conditions
作者: Cao B. ; Zhang W. ; Du Y. ; Wang R. ; Usher S.P. ; Scales P.J. ; Wang D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 130 起始页码: 363
结束页码: 375
语种: 英语
英文关键词: Electrical reaction
; Electro-osmotic dewatering
; Extracellular polymeric substances
; Sludge dewatering
Scopus关键词: Anodes
; Biomolecules
; Biopolymers
; Cathodes
; Dissolution
; Electric fields
; Electrochemical oxidation
; Electrolysis
; Electroosmosis
; Electrophoresis
; Indium compounds
; Ionic strength
; Molecules
; pH effects
; Sludge disposal
; Solubility
; Wastewater disposal
; Dissolved organic matters
; Electrical reactions
; Electro-osmotic dewatering
; Extra-cellular polymeric substances
; Horizontal electric fields
; Micro-structural properties
; Sludge dewatering
; Sludge treatment and disposals
; Dewatering
; biopolymer
; dissolved organic matter
; polymer
; compartmentalization
; dewatering
; electrochemical method
; electrode
; exopolymer
; microstructure
; osmosis
; oxidation
; porous medium
; recycling
; sludge
; solubilization
; wastewater treatment
; acidification
; activated sludge
; Article
; chemical reaction
; dielectric constant
; dissolution
; electric current
; electric potential
; electric resistance
; electrochemical analysis
; electron transport
; electrophoresis
; ionic strength
; moisture
; oxidation
; pH
; priority journal
; recycling
; sludge dewatering
; sludge treatment
; solubilization
; structure analysis
; viscosity
; waste water management
; zeta potential
; chemistry
; China
; devices
; electricity
; electrode
; osmolarity
; osmosis
; oxidation reduction reaction
; pressure
; procedures
; scanning electron microscopy
; sewage
; solubility
; waste water
; China
; China
; Electricity
; Electrodes
; Hydrogen-Ion Concentration
; Microscopy, Electron, Scanning
; Osmolar Concentration
; Osmosis
; Oxidation-Reduction
; Polymers
; Pressure
; Recycling
; Sewage
; Solubility
; Waste Disposal, Fluid
; Waste Water
英文摘要: Sludge treatment and disposal have become important environmental issues in China. Mechanical dewatering is widely used to reduce the amount of sludge to be disposed and relieve the rapid growth pressure of waste sludge. In comparison to traditional sludge dewatering processes, pressure electro-osmotic dewatering has many advantages on sludge dewatering efficiency, low conditioner dosage and concentrated cake are both beneficial to further recycling of waste sludge. In general, complex electrochemical effects (eg. electrochemical oxidation, ohmic heating and pH gradient effect) are accompanied by the pressure electro-osmotic dewatering process. These electrochemical effects will inevitably cause solubilization and/or degradation of key constituents of wastewater sludge - extracellular polymeric substances (EPS). In this study, the effects of voltage, pH and ionic strength on sludge electro-osmotic dewatering performance and electrochemical effects were investigated. The solubilization and degradation of EPS were analyzed by examining the variation of dissolved organic matter (DOM) in the filtrate, and the relationships between microstructural properties of sludge cake and DOM and electro-osmosis dewatering performance in electro-dewatering process was examined. It was found that electro-dewatering properties were improved by raising the operating voltage or decreasing the pH value, while dewatering rate initially increased at low ionic strength it decreases with increased ionic strength. In addition, the porous structure of cathodic cake was more plentiful than that at the anode. At the cathode, the EPS dissolution was mainly related to alkalization, while the oxidation and acidification were responsible for release of EPS at the anode. Meanwhile, electrophoresis effect was able to promote migration of EPS toward the anode. The average electro-osmotic dewatering rate at the anode (R2.>0.79, p < 0.02) and at the cathode (R2.>0.87, p < 0.03) strongly correlated with the volume of pore of sludge cake. There was no correlation between the total content of anodic DOM (R2<0.31, p>0.08) and electro-osmotic dewatering rate at the anode, however, the content of cathodic DOM (R2 > 0.62, p < 0.09) negatively correlated with average electro-osmosis dewatering rate of cathode. Since cathode is the main water-permeable side in sludge electro-dewatering, and the sticky biopolymers (proteins and humic subtances) could not be converted into small molecules, higher EPS release was associated with worse sludge filterability. As for the anode, the biopolymers were degraded into small molecules due to electrochemical oxidation, which greatly reduced the impact of DOM on dewatering effect. Therefore, the operating conditions (voltage, pH and ionic strength) caused changes in electrochemical effects, which played a crucial role in compartmentalization of sludge EPS dissolution and consequently sludge electro-dewatering behavior. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113050
Appears in Collections: 气候减缓与适应
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作者单位: University of Chinese Academy of Science, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China; Xi'an Polytechnic University, Xi'an, 710048, China; Particuate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne301, Australia
Recommended Citation:
Cao B.,Zhang W.,Du Y.,et al. Compartmentalization of extracellular polymeric substances (EPS) solubilization and cake microstructure in relation to wastewater sludge dewatering behavior assisted by horizontal electric field: Effect of operating conditions[J]. Water Research,2018-01-01,130