DOI: 10.1016/j.watres.2019.02.049
Scopus记录号: 2-s2.0-85062232858
论文题名: Correlation between oxidation-reduction potential values and sludge dewaterability during pre-oxidation
作者: Lv Y. ; Xiao K. ; Yang J. ; Zhu Y. ; Pei K. ; Yu W. ; Tao S. ; Wang H. ; Liang S. ; Hou H. ; Liu B. ; Hu J.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 155 起始页码: 96
结束页码: 105
语种: 英语
英文关键词: Correlation
; Oxidation-reduction potential
; Pre-oxidation
; Sludge dewaterability
; Waste activated sludge
英文摘要: Pre-oxidation is effective in enhancing sludge dewaterability. Different types and doses of oxidants are used to improve sludge dewaterability in pre-oxidation. Rapid evaluation of the sludge dewaterability is vital for optimizing the type and dose of oxidants in pre-oxidation. It normally takes more time to evaluate sludge dewaterability by measuring typical indicators such as specific resistance to filtration (SRF), content of bound water, and composition of EPS. This study presented a rapid parameter, oxidation-reduction potential (ORP), to correlate it with the dewaterability of pre-oxidized sludge samples. An index of ΔORP (ΔORP = ORP t=0.5 min –ORP t=0 min ) showed positive correlations with SRF (r = 0.89, p < 0.05), content of total organic carbon in soluble and loosely-bound EPS (r = 0.86 and 0.84, p < 0.05), zeta potential (r = 0.86, p < 0.05), and content of Fe(III) in the sludge cake (r = 0.92, p < 0.01). However, the ΔORP index showed negative correlations with tryptophan-like proteins, tyrosine-like proteins, microbial byproduct-like materials in tightly-bound EPS (r = −0.85, −0.90 and −0.90, p < 0.05), and sludge particle sizes (p < 0.01). A multiple linear regression model was developed to further reflect the linear correlation between the ΔORP values and the key factors reflecting sludge dewaterability. An optimal dose of oxone (0.4 mmol/g VS) for sludge pre-oxidation with the ΔORP value of 387 mV combined with Fe(III) coagulation conditioning system were verified by the results of dewatering experiments using a laboratory-scale diaphragm filter press. This study demonstrated the feasibility of using ΔORP as a potential rapid evaluation tool for sludge dewaterability. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121915
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycling, Luoyu Road 1037, Wuhan, Hubei 430074, China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei 430074, China
Recommended Citation:
Lv Y.,Xiao K.,Yang J.,et al. Correlation between oxidation-reduction potential values and sludge dewaterability during pre-oxidation[J]. Water Research,2019-01-01,155