Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate
Surplus sludge disposal and treatment are major issues in wastewater treatment plants. Discharge plasma oxidation is an effective approach for sludge dewatering and digestion. In this study, excess sludge disintegration by non-thermal discharge plasma coupled with thiosulfate (TSA) was investigated....
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MDPI AG
2023-09-01
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| Online Access: | https://www.mdpi.com/2073-4441/15/18/3313 |
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| author | Hekai Jin Song Lin Yueyun Yang Zhixin Liang Yiqi Chen Lei Hua Ying Zhang Hongtao Jia Guodong Zhang Tiecheng Wang |
| author_facet | Hekai Jin Song Lin Yueyun Yang Zhixin Liang Yiqi Chen Lei Hua Ying Zhang Hongtao Jia Guodong Zhang Tiecheng Wang |
| author_sort | Hekai Jin |
| collection | DOAJ |
| description | Surplus sludge disposal and treatment are major issues in wastewater treatment plants. Discharge plasma oxidation is an effective approach for sludge dewatering and digestion. In this study, excess sludge disintegration by non-thermal discharge plasma coupled with thiosulfate (TSA) was investigated. After 20 min of the single discharge plasma treatment, the soluble chemical oxygen demand (SCOD) increased to 404.93 mg L<sup>−1</sup>, and it climbed even more to 549.08 mg L<sup>−1</sup> after adding 15 mmol L<sup>−1</sup> of TSA. The water content of the filter cake also reduced even more in the presence of TSA. There was an appropriate dosage of TSA available. In the discharge plasma coupled with TSA system, reactive oxygen species (·OH and O<sub>2</sub><sup>−</sup>) were generated and had significant involvement in the disintegration of the sludge. The addition of TSA enhanced the production of OH. These reactive oxygen species decomposed the floc structures and facilitated the transformation of organic compounds, resulting in a decrease in the average size of the sludge aggregates. The ratio of soluble extracellular polymer substances (S-EPS) was enhanced, while the ratio of the tightly bound fraction was reduced after the treatment. Thus, discharge plasma coupled with TSA promoted microbial cell lysis and facilitated the release of intracellular organic matter and bound water, ultimately enhancing the sludge’s dewaterability. |
| first_indexed | 2024-03-10T21:51:05Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T21:51:05Z |
| publishDate | 2023-09-01 |
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| record_format | Article |
| series | Water |
| spelling | doaj.art-fbb2da929d3b450fbce42b01bb6996f52023-11-19T13:26:53ZengMDPI AGWater2073-44412023-09-011518331310.3390/w15183313Excess Sludge Disintegration by Discharge Plasma Coupled with ThiosulfateHekai Jin0Song Lin1Yueyun Yang2Zhixin Liang3Yiqi Chen4Lei Hua5Ying Zhang6Hongtao Jia7Guodong Zhang8Tiecheng Wang9College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Humanities and Law, Wuchang University of Technology, Wuhan 430223, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaCollege of Natural Resources and Environment, Northwest A&F University, Yangling 712100, ChinaSurplus sludge disposal and treatment are major issues in wastewater treatment plants. Discharge plasma oxidation is an effective approach for sludge dewatering and digestion. In this study, excess sludge disintegration by non-thermal discharge plasma coupled with thiosulfate (TSA) was investigated. After 20 min of the single discharge plasma treatment, the soluble chemical oxygen demand (SCOD) increased to 404.93 mg L<sup>−1</sup>, and it climbed even more to 549.08 mg L<sup>−1</sup> after adding 15 mmol L<sup>−1</sup> of TSA. The water content of the filter cake also reduced even more in the presence of TSA. There was an appropriate dosage of TSA available. In the discharge plasma coupled with TSA system, reactive oxygen species (·OH and O<sub>2</sub><sup>−</sup>) were generated and had significant involvement in the disintegration of the sludge. The addition of TSA enhanced the production of OH. These reactive oxygen species decomposed the floc structures and facilitated the transformation of organic compounds, resulting in a decrease in the average size of the sludge aggregates. The ratio of soluble extracellular polymer substances (S-EPS) was enhanced, while the ratio of the tightly bound fraction was reduced after the treatment. Thus, discharge plasma coupled with TSA promoted microbial cell lysis and facilitated the release of intracellular organic matter and bound water, ultimately enhancing the sludge’s dewaterability.https://www.mdpi.com/2073-4441/15/18/3313excess sludgedischarge plasmathiosulfatedisintegration |
| spellingShingle | Hekai Jin Song Lin Yueyun Yang Zhixin Liang Yiqi Chen Lei Hua Ying Zhang Hongtao Jia Guodong Zhang Tiecheng Wang Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate Water excess sludge discharge plasma thiosulfate disintegration |
| title | Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate |
| title_full | Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate |
| title_fullStr | Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate |
| title_full_unstemmed | Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate |
| title_short | Excess Sludge Disintegration by Discharge Plasma Coupled with Thiosulfate |
| title_sort | excess sludge disintegration by discharge plasma coupled with thiosulfate |
| topic | excess sludge discharge plasma thiosulfate disintegration |
| url | https://www.mdpi.com/2073-4441/15/18/3313 |
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