gchange  > 气候变化事实与影响
DOI: 10.1016/j.watres.2019.02.047
Scopus ID: 2-s2.0-85062341078
Title:
Variations in macro and micro physicochemical properties of activated sludge under a moderate oxidation-in situ coagulation conditioning: Relationship between molecular structure and dewaterability
Author: Zhang D.; Wang Y.; Gao H.; Fan X.; Guo Y.; Wang H.; Zheng H.
Source Publication: Water Research
ISSN: 431354
Indexed By: SCI ; SCI-E ; EI
Publishing Year: 2019
Volume: 155
pages begin: 245
pages end: 254
Language: 英语
Keyword: Activated sludge ; EPS migration ; Extracellular polymeric substance ; Factor analysis ; Filterability and dewaterability ; Protein secondary structure
English Abstract: A moderate Mn(Ⅶ) oxidation-in situ Fe(Ⅲ) coagulation (Mn(Ⅶ)-Fe(Ⅱ)) conditioning strategy was proposed to improve sludge filterability and release the water bound in extracellular polymeric substances (EPS). During Mn(Ⅶ)-Fe(Ⅱ) conditioning, flocs disintegration and cell disruption, macro and micro physicochemical properties of activated sludge, especially of EPS, were investigated. Relationships between protein molecular structures in EPS fractions of three layers and sludge dewaterability were also determined. Besides, factor analysis was used to explain the variances of “functional” protein secondary structures, which may have an important effect on sludge dewaterability. Results showed that sludge filterability (CST 0 /CST) increased by 2.40 times and partial bound water was released at 2 min oxidation of 120 mg/g KMnO 4 with subsequent FeCl 2 termination at equivalent molar ratio of 1:3. During this strategy, EPS wrapping on cells surface was disintegrated, and a limited influence occurred on cells. It was also found that CST and bound water content were strongly correlated with aggregated strands, random coil and β-turn percentages in slime (R 2 >−0.82, p < 0.05). Moreover, the dewaterability also presented strong negative correlations with aggregated strands, β-sheet and β-turn in TB-EPS (R 2 >−0.78, p < 0.05). This suggested that unfolding and despiralization of slime protein and moderate weakening rigidity of tightly bound EPS (TB-EPS) protein were beneficial for improvement of sludge dewaterability. In addition, the strong correlation between percentages of “functional” protein secondary structures and factor 1 score (R 2 > 0.85, p < 0.05) demonstrated that EPS migration, rather than only EPS disintegration, may have a key impact on the formation of some protein secondary structures in slime and TB-EPS. The observed protein secondary structures, which may affect sludge dewaterability, were probably derived from inner EPS. © 2019 Elsevier Ltd
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Document Type: 期刊论文
Identifier: http://119.78.100.177/globalchange/handle/2HF3EXSE/121908
Appears in Collections:气候变化事实与影响

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Affiliation: College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, 100083, China; Xiong'an Institute of Eco-Environment, Hebei University, Baoding, 071002, China; Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, China

Recommended Citation:
Zhang D.,Wang Y.,Gao H.,et al. Variations in macro and micro physicochemical properties of activated sludge under a moderate oxidation-in situ coagulation conditioning: Relationship between molecular structure and dewaterability[J]. Water Research,2019-01-01,155
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