Distinct effects of chemical- and bio- flocculants on the sludge acidogenic fermentation for volatile fatty acids production by affecting the acidogenic steps, microbial community structure and metabolic functions
Copyright © 2023. Published by Elsevier B.V..
Flocculants play crucial roles in sludge treatment, while the specific impact of chemical and bio-flocculants on sludge anaerobic fermentation was unknown. This study unveiled the contrasting effects of chitosan (CTS) and poly‑aluminum chloride (PAC) on volatile fatty acids (VFAs) generation during sludge fermentation. CTS supplementation resulted in 17.2 % increase in VFAs production, while PAC exposure led to 7.6 % reduction compared to the control. Further investigation revealed that CTS facilitated sludge solubilization and hydrolysis, thus providing sufficient organic substrates for VFAs generation. Additionally, environmental-friendly CTS exposure positively influenced the abundance and activity of functional anaerobes, as well as the expression of genes associated with VFAs biosynthesis. In contrast, PAC exposure resulted in the formation of larger sludge flocs, which hindered WAS solubilization and hydrolysis. Meanwhile, its potential microbial toxicity also impeded the microbial metabolic activity (i.e., genetic expressions), resulting in unsatisfactory VFAs production.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:905 |
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| Enthalten in: |
The Science of the total environment - 905(2023) vom: 20. Dez., Seite 167207 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Luo, Jingyang [VerfasserIn] |
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| Links: |
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| Themen: |
Chitosan |
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| Anmerkungen: |
Date Completed 15.11.2023 Date Revised 22.11.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.scitotenv.2023.167207 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 500 | |a published: Print-Electronic | ||
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| 520 | |a Copyright © 2023. Published by Elsevier B.V. | ||
| 520 | |a Flocculants play crucial roles in sludge treatment, while the specific impact of chemical and bio-flocculants on sludge anaerobic fermentation was unknown. This study unveiled the contrasting effects of chitosan (CTS) and poly‑aluminum chloride (PAC) on volatile fatty acids (VFAs) generation during sludge fermentation. CTS supplementation resulted in 17.2 % increase in VFAs production, while PAC exposure led to 7.6 % reduction compared to the control. Further investigation revealed that CTS facilitated sludge solubilization and hydrolysis, thus providing sufficient organic substrates for VFAs generation. Additionally, environmental-friendly CTS exposure positively influenced the abundance and activity of functional anaerobes, as well as the expression of genes associated with VFAs biosynthesis. In contrast, PAC exposure resulted in the formation of larger sludge flocs, which hindered WAS solubilization and hydrolysis. Meanwhile, its potential microbial toxicity also impeded the microbial metabolic activity (i.e., genetic expressions), resulting in unsatisfactory VFAs production | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Chitosan | |
| 650 | 4 | |a Metabolic function | |
| 650 | 4 | |a Microbial toxicity | |
| 650 | 4 | |a Poly‑aluminum chloride | |
| 650 | 4 | |a Volatile fatty acids | |
| 650 | 7 | |a Sewage |2 NLM | |
| 650 | 7 | |a Fatty Acids, Volatile |2 NLM | |
| 700 | 1 | |a Xia, Xue |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Yuxiao |e verfasserin |4 aut | |
| 700 | 1 | |a Fang, Shiyu |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Feng |e verfasserin |4 aut | |
| 700 | 1 | |a Cheng, Xiaoshi |e verfasserin |4 aut | |
| 700 | 1 | |a Feng, Leiyu |e verfasserin |4 aut | |
| 700 | 1 | |a Huang, Wenxuan |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Yang |e verfasserin |4 aut | |
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