Correlation between oxidation-reduction potential values and sludge dewaterability during pre-oxidation
Copyright © 2019 Elsevier Ltd. All rights reserved..
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 = ORPt=0.5 min-ORPt=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.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:155 |
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| Enthalten in: |
Water research - 155(2019) vom: 15. Mai, Seite 96-105 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Lv, Yang [VerfasserIn] |
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| Links: |
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| Themen: |
059QF0KO0R |
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| Anmerkungen: |
Date Completed 30.10.2019 Date Revised 30.10.2019 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.watres.2019.02.049 |
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| Förderinstitution / Projekttitel: |
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NLM294603700 |
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| 520 | |a 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 = ORPt=0.5 min-ORPt=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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Correlation | |
| 650 | 4 | |a Oxidation-reduction potential | |
| 650 | 4 | |a Pre-oxidation | |
| 650 | 4 | |a Sludge dewaterability | |
| 650 | 4 | |a Waste activated sludge | |
| 650 | 7 | |a Ferric Compounds |2 NLM | |
| 650 | 7 | |a Sewage |2 NLM | |
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| 700 | 1 | |a Yang, Jiakuan |e verfasserin |4 aut | |
| 700 | 1 | |a Zhu, Yuwei |e verfasserin |4 aut | |
| 700 | 1 | |a Pei, Kangyue |e verfasserin |4 aut | |
| 700 | 1 | |a Yu, Wenbo |e verfasserin |4 aut | |
| 700 | 1 | |a Tao, Shuangyi |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Hui |e verfasserin |4 aut | |
| 700 | 1 | |a Liang, Sha |e verfasserin |4 aut | |
| 700 | 1 | |a Hou, Huijie |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Bingchuan |e verfasserin |4 aut | |
| 700 | 1 | |a Hu, Jingping |e verfasserin |4 aut | |
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