Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization
Carbon capture has become an important technology to mitigate ever-increasing CO2 emissions worldwide, and alkali waste is a potential source of CO2 capture material. Slagging-gasification is a novel technology for treating municipal solid waste (MSW), and the gasification fly ash (GFA) is the only...
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sg-ntu-dr.10356-1633332024-04-24T15:38:01Z Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization Qin, Junde Zhang, Yunhui Yi, Yaolin Fang, Mingliang School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Engineering Municipal Solid Waste Gasification Carbon capture has become an important technology to mitigate ever-increasing CO2 emissions worldwide, and alkali waste is a potential source of CO2 capture material. Slagging-gasification is a novel technology for treating municipal solid waste (MSW), and the gasification fly ash (GFA) is the only solid residue that is not reused at present due to its high heavy metal content. GFA contains high amounts of Ca(OH)2 and Ca(OH)Cl, making it protentional for CO2 capture. In this study, GFA and washed gasification fly ash (WGFA) were treated with CO2 for different treatment periods. Weight changes of samples were recorded to evaluate the efficiency of CO2 capture. To assess the properties of treated GFA, pH value, leached heavy metal concentration, mineral composition, and microscopic morphology were studied. The results revealed that GFA and WGFA could adsorb 18.8% and 23.7% CO2 of their weights, respectively. Carbonation could immobilize heavy metals including Pb, Zn, and Cu when a proper treatment period was applied. An excessive treatment period decreased the efficiency of heavy metal immobilization. Pre-washing is recommended as a pre-treatment method for GFA carbonation, which increased the efficiency to adsorb CO2, improved the pH of carbonated GFA, and enhanced the effect to immobilize heavy metals. Ministry of Education (MOE) Submitted/Accepted version This research is supported by the Ministry of Education, Singapore, under its Academic Research Fund Tier 1 grant (RG139/20). 2022-12-02T06:59:32Z 2022-12-02T06:59:32Z 2022 Journal Article Qin, J., Zhang, Y., Yi, Y. & Fang, M. (2022). Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization. Environmental Pollution, 308, 119662-. https://dx.doi.org/10.1016/j.envpol.2022.119662 0269-7491 https://hdl.handle.net/10356/163333 10.1016/j.envpol.2022.119662 35752393 2-s2.0-85133572580 308 119662 en RG139/20 Environmental Pollution © 2022 Elsevier Ltd. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1016/j.envpol.2022.119662. application/pdf |
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Engineering Municipal Solid Waste Gasification Qin, Junde Zhang, Yunhui Yi, Yaolin Fang, Mingliang Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
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Carbon capture has become an important technology to mitigate ever-increasing CO2 emissions worldwide, and alkali waste is a potential source of CO2 capture material. Slagging-gasification is a novel technology for treating municipal solid waste (MSW), and the gasification fly ash (GFA) is the only solid residue that is not reused at present due to its high heavy metal content. GFA contains high amounts of Ca(OH)2 and Ca(OH)Cl, making it protentional for CO2 capture. In this study, GFA and washed gasification fly ash (WGFA) were treated with CO2 for different treatment periods. Weight changes of samples were recorded to evaluate the efficiency of CO2 capture. To assess the properties of treated GFA, pH value, leached heavy metal concentration, mineral composition, and microscopic morphology were studied. The results revealed that GFA and WGFA could adsorb 18.8% and 23.7% CO2 of their weights, respectively. Carbonation could immobilize heavy metals including Pb, Zn, and Cu when a proper treatment period was applied. An excessive treatment period decreased the efficiency of heavy metal immobilization. Pre-washing is recommended as a pre-treatment method for GFA carbonation, which increased the efficiency to adsorb CO2, improved the pH of carbonated GFA, and enhanced the effect to immobilize heavy metals. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Qin, Junde Zhang, Yunhui Yi, Yaolin Fang, Mingliang |
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Qin, Junde Zhang, Yunhui Yi, Yaolin Fang, Mingliang |
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Qin, Junde |
title |
Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
title_short |
Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
title_full |
Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
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Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
title_full_unstemmed |
Carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
title_sort |
carbonation of municipal solid waste gasification fly ash: effects of pre-washing and treatment period on carbon capture and heavy metal immobilization |
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2022 |
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https://hdl.handle.net/10356/163333 |
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1806059893970436096 |