DOI: 10.1016/j.watres.2018.10.033
Scopus记录号: 2-s2.0-85055285888
论文题名: Unraveling oxidation behaviors for intracellular and extracellular from different oxidants (HOCl vs. H2O2) catalyzed by ferrous iron in waste activated sludge dewatering
作者: Yu W. ; Wen Q. ; Yang J. ; Xiao K. ; Zhu Y. ; Tao S. ; Lv Y. ; Liang S. ; Fan W. ; Zhu S. ; Liu B. ; Hou H. ; Hu J.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 148 起始页码: 60
结束页码: 69
语种: 英语
英文关键词: Cell lysis
; Deep-dewatering
; Extracellular and intracellular oxidation
; Hypochlorite acid
; Oxidation intensity
; Waste activated sludge
Scopus关键词: Calcium compounds
; Catalysis
; Cells
; Chlorine compounds
; Cytology
; Dewatering
; Enzyme activity
; Filtration
; Iron
; Iron compounds
; Oxidants
; Particle size
; Surface reactions
; Advanced oxidation process
; Cell lysis
; Dewatering performance
; Extracellular
; Hypochlorite acid
; Response surface methodology
; Sludge dewaterability
; Waste activated sludges
; Oxidation
; ferrous ion
; hydrogen peroxide
; hydroxyl group
; hydroxyl radical
; hypochlorous acid
; acidification
; activated sludge
; cell
; chemical alteration
; dewatering
; hydroxyl radical
; organic acid
; oxidation
; waste treatment
; water content
; activated sludge
; Article
; coliform bacterium
; extracellular polymeric substance
; Fenton reaction
; particle size
; pH
; physical chemistry
; polymerization
; response surface method
; sludge dewatering
; waste
; water content
英文摘要: Cell lysis in sludge pretreatment by advanced oxidation process (AOP) has a great effect on sludge dewaterability. Cell lysis caused by reactive radicals (e.g. hydroxyl radical) was dependent on the reaction site of AOP. However, little is known about the accurate radical generation site of AOP in sludge pretreatment. In this study, two kinds of oxidation behaviors from different oxidants (HOCl vs. H2O2) catalyzed by ferrous iron were comparatively investigated. Higher amount of living cells (84.3%) and hydroxyl radicals (9.86 × 10−5 M), and more fragmentized sludge flocs (particle sizes of D50 was 50.1 vs. 57.3 μm of RS) were detected in sludge conditioned by Fe2+/H2O2, which implied that Fenton reaction mainly happened at surface and outside of sludge flocs (such as EPS layer and liquid phase). Thus, it could be regarded as “extracellular oxidation”. Fewer living cells (undetectable), fewer amount of hydroxyl radicals (undetectable in sludge), and more integrated sludge flocs (particle size of D50 was 56.1 vs. 57.3 μm of RS) were determined in sludge conditioned by Fe2+/Ca(ClO)2. Hence, it could be regarded as “Intracellular oxidation”. In addition, sludge pretreatment based on Fe2+/Ca(ClO)2 could achieve simultaneous deep-dewatering performance and total coliforms inactivation. Based on response surface methodology, the optimal dosages of Fe2+ and Ca(ClO)2 were proposed as 106.1 and 234.5 mg/g volatile solids respectively, without any acidification of sludge. Under these optimal dosages, the water content of dewatered sludge cake was 51.9 ± 0.1 wt% and the pH of the final filtrate was 5.8 ± 0.2. Total coliforms of sludge could be inactivated in 10 s after Fe2+/Ca(ClO)2 addition. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122216
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; Hubei Provincial Engineering Laboratory of Solid Waste Treatment, Disposal and Recycle Technology, Wuhan, Hubei 430074, China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China; School of Urban and Environmental Science, Northeast Normal University, Changchun, Jilin 130024, China; School of Urban and Environmental Science, Northeast Normal University, Changchun, Jilin 130024, China
Recommended Citation:
Yu W.,Wen Q.,Yang J.,et al. Unraveling oxidation behaviors for intracellular and extracellular from different oxidants (HOCl vs. H2O2) catalyzed by ferrous iron in waste activated sludge dewatering[J]. Water Research,2019-01-01,148