Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge
Abstract Co-combustion technology of coal and sewage sludge (SS) was encouraged and recommended in China. Previous studies most focused on its influence on combustion characteristics, migration characteristics of heavy metals in fly ash, and emission of conventional pollutants, etc., but less report...
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| Format: | Article |
| Language: | English |
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Springer
2021-08-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.210179 |
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| author | Mumin Rao Xiangbo Zou Ji Ye Yunfeng Ma Tieying Mao Xiaoqing Lin Xiaodong Li Jianhua Yan Shiwei Qin Cao Kuang |
| author_facet | Mumin Rao Xiangbo Zou Ji Ye Yunfeng Ma Tieying Mao Xiaoqing Lin Xiaodong Li Jianhua Yan Shiwei Qin Cao Kuang |
| author_sort | Mumin Rao |
| collection | DOAJ |
| description | Abstract Co-combustion technology of coal and sewage sludge (SS) was encouraged and recommended in China. Previous studies most focused on its influence on combustion characteristics, migration characteristics of heavy metals in fly ash, and emission of conventional pollutants, etc., but less reported the formation characteristics of polychlorinated-ρ-dibenzodioxins and dibenzofurans (PCDD/Fs). To well reveal it, this study carried out five parallel experiments, including the pyrolysis of SS, the combustion of SS, the co-combustion of coal and SS with the proportion of 0%, 2.5% and 5%, respectively. The emission concentration of PCDD/Fs respectively increased from 0.42 ng g−1 (0.0022 ng I-TEQ g−1) to 0.54 ng g−1 (0.0030 ng I-TEQ g−1) and 1.70 ng g−1 (0.0305 ng I-TEQ g−1) with increasing blending proportion of SS. The dominant part was also changed from PCDF (0.32 ng g−1 in M-0%, 0.38 ng g−1 in M-2.5%) to PCDD (1.11 ng g−1 in M-5%). The formation concentration of PCDD/Fs in the combustion process of SS was about 0.34 ng g−1 (0.0019 ng I-TEQ g−1). In the pyrolysis process of SS, the concentration of PCDD/Fs was 0.59 ng g−1 (0.0037 ng I-TEQ g−1). The de novo synthesis should be the major formation pathway of PCDD/Fs in the co-combustion process of coal and SS. On the basis of sufficient carbon sources, the PCA analysis revealed the chlorine source (Cl) and metal catalyst (Fe) should contribute a lot on the formation of PCDD/Fs. The results paved the way for further optimization on the operation of co-combustion of coal and SS and assist in controlling the PCDD/F emission from co-combustion process. |
| format | Article |
| id | doaj-art-fc666e5ae88e41f49362fc08f1202d2d |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2021-08-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-fc666e5ae88e41f49362fc08f1202d2d2025-02-09T12:20:33ZengSpringerAerosol and Air Quality Research1680-85842071-14092021-08-01211111210.4209/aaqr.210179Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage SludgeMumin Rao0Xiangbo Zou1Ji Ye2Yunfeng Ma3Tieying Mao4Xiaoqing Lin5Xiaodong Li6Jianhua Yan7Shiwei Qin8Cao Kuang9Guangdong Energy Group Science and Technology Research Institute Co., Ltd.Guangdong Energy Group Science and Technology Research Institute Co., Ltd.Guangdong Energy Group Science and Technology Research Institute Co., Ltd.State Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang UniversityState Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang UniversityState Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang UniversityState Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang UniversityState Key Laboratory for Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang UniversityGuangdong Energy Group Science and Technology Research Institute Co., Ltd.Guangdong Energy Group Science and Technology Research Institute Co., Ltd.Abstract Co-combustion technology of coal and sewage sludge (SS) was encouraged and recommended in China. Previous studies most focused on its influence on combustion characteristics, migration characteristics of heavy metals in fly ash, and emission of conventional pollutants, etc., but less reported the formation characteristics of polychlorinated-ρ-dibenzodioxins and dibenzofurans (PCDD/Fs). To well reveal it, this study carried out five parallel experiments, including the pyrolysis of SS, the combustion of SS, the co-combustion of coal and SS with the proportion of 0%, 2.5% and 5%, respectively. The emission concentration of PCDD/Fs respectively increased from 0.42 ng g−1 (0.0022 ng I-TEQ g−1) to 0.54 ng g−1 (0.0030 ng I-TEQ g−1) and 1.70 ng g−1 (0.0305 ng I-TEQ g−1) with increasing blending proportion of SS. The dominant part was also changed from PCDF (0.32 ng g−1 in M-0%, 0.38 ng g−1 in M-2.5%) to PCDD (1.11 ng g−1 in M-5%). The formation concentration of PCDD/Fs in the combustion process of SS was about 0.34 ng g−1 (0.0019 ng I-TEQ g−1). In the pyrolysis process of SS, the concentration of PCDD/Fs was 0.59 ng g−1 (0.0037 ng I-TEQ g−1). The de novo synthesis should be the major formation pathway of PCDD/Fs in the co-combustion process of coal and SS. On the basis of sufficient carbon sources, the PCA analysis revealed the chlorine source (Cl) and metal catalyst (Fe) should contribute a lot on the formation of PCDD/Fs. The results paved the way for further optimization on the operation of co-combustion of coal and SS and assist in controlling the PCDD/F emission from co-combustion process.https://doi.org/10.4209/aaqr.210179Co-combustion of coal and sewage sludgePolychlorinated-ρ-dibenzodioxins and dibenzofuransPyrolysis of sewage sludgeFormation pathwaysCongener distribution |
| spellingShingle | Mumin Rao Xiangbo Zou Ji Ye Yunfeng Ma Tieying Mao Xiaoqing Lin Xiaodong Li Jianhua Yan Shiwei Qin Cao Kuang Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge Aerosol and Air Quality Research Co-combustion of coal and sewage sludge Polychlorinated-ρ-dibenzodioxins and dibenzofurans Pyrolysis of sewage sludge Formation pathways Congener distribution |
| title | Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge |
| title_full | Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge |
| title_fullStr | Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge |
| title_full_unstemmed | Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge |
| title_short | Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge |
| title_sort | formation characteristics of pcdd fs in the co combustion and pyrolysis process of coal and sewage sludge |
| topic | Co-combustion of coal and sewage sludge Polychlorinated-ρ-dibenzodioxins and dibenzofurans Pyrolysis of sewage sludge Formation pathways Congener distribution |
| url | https://doi.org/10.4209/aaqr.210179 |
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