Levels and patterns of polychlorinated biphenyls in residues from incineration of established source-classified MSW in China |
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| Authors: | Dezhi Shi Pengfei Li Chao Zhang Xianjin Tang |
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| Institution: | 1. Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, National Centre for International Research of Low-Carbon and Green Buildings, Chongqing University, Chongqing, PR Chinashidezhi@cqu.edu.cn;3. Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Faculty of Urban Construction and Environmental Engineering, National Centre for International Research of Low-Carbon and Green Buildings, Chongqing University, Chongqing, PR China;4. College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, PR China |
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| Abstract: | Municipal solid waste (MSW) source-classified collection represents an advancement in resource cycling and secondary pollution control in China. Comparative experiments were performed to assess the levels and patterns of polychlorinated biphenyls in bottom ash, fly ash from boiler, and fly ash from bag filter from an MSW incineration plant with source-classified collection of MSW. Polychlorinated biphenyls were concentrated in the bag filter fly ash and in the bottom ash. The total amount of polychlorinated biphenyls was much lower than in fly ashes and bottom ash from traditional mixed waste incineration. Total concentration of coplanar polychlorinated biphenyls and toxic equivalent quantities were also reduced. Due to variations of feed waste, complete combustion, including continuously high incineration temperature, low CO concentrations and high air excess ratio were observed. Incineration temperature showed a negative correlation, while CO concentration showed a positive correlation with total and coplanar polychlorinated biphenyls, indicating that the latter can be reduced by controlling combustion conditions related to properties of feed waste. |
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| Keywords: | source-classified collection MSW incineration polychlorinated biphenyls bottom ash fly ash |
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