DOI: 10.1016/j.watres.2018.04.051
Scopus记录号: 2-s2.0-85047389103
论文题名: Citric acid assisted Fenton-like process for enhanced dewaterability of waste activated sludge with in-situ generation of hydrogen peroxide
作者: Xiao K. ; Pei K. ; Wang H. ; Yu W. ; Liang S. ; Hu J. ; Hou H. ; Liu B. ; Yang J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 140 起始页码: 232
结束页码: 242
语种: 英语
英文关键词: Citric acid
; Extracellular polymeric substances
; Fenton-like process
; Nano zero-valent iron
; Sludge dewaterability
; Waste activated sludge
Scopus关键词: Chlorine compounds
; Citric acid
; Coagulation
; Decomposition
; Degradation
; Dewatering
; Filtration
; Hydrogen peroxide
; Iron compounds
; Magnetic moments
; Oxidation
; Peroxides
; Proteins
; Extra-cellular polymeric substances
; Fenton-like process
; Nano zero-valent irons
; Sludge dewaterability
; Waste activated sludges
; Activated sludge process
; citric acid
; ferric ion
; ferrous ion
; guanine nucleotide binding protein
; hydrogen peroxide
; hydroxyl radical
; iron nanoparticle
; polydiallyldimethylammonium chloride
; polymer
; unclassified drug
; acidification
; activated sludge
; activation energy
; citric acid
; dewatering
; discharge
; dose-response relationship
; homogeneity
; hydrogen peroxide
; moisture content
; neutralization
; response surface methodology
; activated sludge
; Article
; controlled study
; decomposition
; electron spin resonance
; Fenton reaction
; moisture
; oxidation
; pH
; polymerization
; precipitation
; priority journal
; protein content
; protein degradation
; response surface method
; sludge dewatering
; solid
; solubilization
; static electricity
; zeta potential
英文摘要: Fenton's reagent has been widely used to enhance sludge dewaterability. However, drawbacks associated with hydrogen peroxide (H2O2) in Fenton's reagents exist, since it is a hazardous chemical and shows carcinogenicity, explosivity, instability, and corrosivity. Moreover, initial acidification and subsequent neutralization are needed as optimal conditions for homogeneous Fenton conditioning and final filtrate discharge. In this study, a Fenton-like process for the enhanced dewaterability of waste activated sludge with in-situ generation of H2O2 and without extra pH adjustment was firstly proposed, namely citric acid (CA)-assisted oxygen activation in an air/nano zero-valent iron (nZVI) system and chemical re-coagulation with polydiallyldimethylammonium chloride (PDMDAAC). Using the response surface methodology (RSM), the optimal doses of CA, nZVI, and PDMDAAC were determined to be 13, 33, and 9 mg g−1 dry solids (DS), respectively. This composite conditioner showed a good dewatering capability compared with the raw sludge, e.g. the capillary suction time decreased from 130.0 to 9.5 s. The enhanced sludge dewaterability was further confirmed by laboratory-scale diaphragm filter press dewatering tests, which produced a lower cake moisture content compared with the raw sludge, and the final pH of the filtrate was close to neutrality. The citric acid promoted the production of H2O2 and Fe(II)/Fe(III) species, the degradation of protein in tightly-bound extracellular polymeric substances, and the decomposition of protein-N in the solid phase of sludge, resulting a greater conversion of bound water to free water. The results of electron spin resonance indicated that the hydroxyl radicals were mainly responsible for the decomposition of proteinaceous compounds. The subsequent chemical re-coagulation with PDMDAAC can make the zeta potential of sludge samples less negative, reduce the repulsive electrostatic interactions, and agglomerate the smaller particles into larger aggregates, thus enhancing sludge dewaterability. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112715
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, Wuhan, Hubei 430074, China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Wuhan, Hubei 430074, China
Recommended Citation:
Xiao K.,Pei K.,Wang H.,et al. Citric acid assisted Fenton-like process for enhanced dewaterability of waste activated sludge with in-situ generation of hydrogen peroxide[J]. Water Research,2018-01-01,140