Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness
This study compared the three wastewater pretreatments of ozonation, Fe2+-S2O82− and freeze-thawing (F/T) in the disintegration, anaerobic digestion (AD) and final disposal of the sludge. The F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8% and 47.1%, respectivel...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-10-01
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| Series: | Environmental Science and Ecotechnology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666498421000569 |
| _version_ | 1819319212298993664 |
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| author | Haiyang He Xiaodong Xin Wei Qiu Dong Li Zhicen Liu Jun Ma |
| author_facet | Haiyang He Xiaodong Xin Wei Qiu Dong Li Zhicen Liu Jun Ma |
| author_sort | Haiyang He |
| collection | DOAJ |
| description | This study compared the three wastewater pretreatments of ozonation, Fe2+-S2O82− and freeze-thawing (F/T) in the disintegration, anaerobic digestion (AD) and final disposal of the sludge. The F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8% and 47.1%, respectively. The ozonation pretreatment formed more volatile fatty acids (VFAs), with a peak value of 320.82 mg SCOD/L and controlled the release of sulfides. The Fe2+-S2O82− pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed in-situ. During the anaerobic digestion of the sludge, the ozonation pretreatment accelerated the hydrolysis rate (k) rather than the biochemical methane potential (B0) of the sludge due to the high VFA content in the supernatant. Comparatively, the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the sludge. Although Fe2+-S2O82− pretreatment decreased the methane production, the ferric particle was a unique advantage in the disintegration and harmless disposal of the sludge. The digested sludge had more VFAs after ozonation pretreatment, which contributed to the recycling of carbon. In addition, the lower sludge volume could save the expense of transportation and disposal by ozonation pretreatment. Different pretreatments had different characteristics. The comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge. |
| first_indexed | 2024-12-24T11:00:06Z |
| format | Article |
| id | doaj.art-a5141de480a74c6ea1fd6dd679e32d72 |
| institution | Directory Open Access Journal |
| issn | 2666-4984 |
| language | English |
| last_indexed | 2024-12-24T11:00:06Z |
| publishDate | 2021-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environmental Science and Ecotechnology |
| spelling | doaj.art-a5141de480a74c6ea1fd6dd679e32d722022-12-21T16:58:44ZengElsevierEnvironmental Science and Ecotechnology2666-49842021-10-018100132Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectivenessHaiyang He0Xiaodong Xin1Wei Qiu2Dong Li3Zhicen Liu4Jun Ma5State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, ChinaDepartment of Environmental Science and Engineering, Huaqiao University, Xiamen, 361021, ChinaState Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China; Corresponding author.Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, ChinaSchool of Geosciences, The University of Edinburgh, Edinburgh, EH8 9JU, UKState Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China; Corresponding author.This study compared the three wastewater pretreatments of ozonation, Fe2+-S2O82− and freeze-thawing (F/T) in the disintegration, anaerobic digestion (AD) and final disposal of the sludge. The F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8% and 47.1%, respectively. The ozonation pretreatment formed more volatile fatty acids (VFAs), with a peak value of 320.82 mg SCOD/L and controlled the release of sulfides. The Fe2+-S2O82− pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed in-situ. During the anaerobic digestion of the sludge, the ozonation pretreatment accelerated the hydrolysis rate (k) rather than the biochemical methane potential (B0) of the sludge due to the high VFA content in the supernatant. Comparatively, the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the sludge. Although Fe2+-S2O82− pretreatment decreased the methane production, the ferric particle was a unique advantage in the disintegration and harmless disposal of the sludge. The digested sludge had more VFAs after ozonation pretreatment, which contributed to the recycling of carbon. In addition, the lower sludge volume could save the expense of transportation and disposal by ozonation pretreatment. Different pretreatments had different characteristics. The comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge.http://www.sciencedirect.com/science/article/pii/S2666498421000569Sludge disintegrationAnaerobic sludge digestionEffectiveness comparisonDifferent pretreatments |
| spellingShingle | Haiyang He Xiaodong Xin Wei Qiu Dong Li Zhicen Liu Jun Ma Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness Environmental Science and Ecotechnology Sludge disintegration Anaerobic sludge digestion Effectiveness comparison Different pretreatments |
| title | Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness |
| title_full | Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness |
| title_fullStr | Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness |
| title_full_unstemmed | Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness |
| title_short | Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness |
| title_sort | waste sludge disintegration methanogenesis and final disposal via various pretreatments comparison of performance and effectiveness |
| topic | Sludge disintegration Anaerobic sludge digestion Effectiveness comparison Different pretreatments |
| url | http://www.sciencedirect.com/science/article/pii/S2666498421000569 |
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