Cement kiln co-processing techniques have been developed in the past 20 years in China,and more than 60 factories now use fermentation,screening,and gasification pre-treatment techniques to co-process municipal solid waste(MSW).There three complete MSW pre-treatment techniques,co-processing procedures,and environmental risk assessments have been described in few publications.In this study,we assessed the effectiveness of each technique.The results suggested that the pollutant content released by each pre-treatment technology was lower than the emission standard.To reveal the mechanisms of pollutant migration and enrichment,the substances in the kiln and kiln products are investigated.The input of co-processing materials(Co-M)produced by fermentation caused formation of polychlorinated dibenzo-p-dioxins and dibenzofuran(PCDD/Fs)in the bypass flue gas(By-gas)in excess of the regulatory standard.The Co-M input produced by the screening and gasifier technologies caused the total organic carbon(TOC)concentration to exceed the standard.In addition,the NOx,TOC,and PCDD/Fs in the By-gas exceeded the regulatory standard.Raw meal was the primary chlorine and heavy metals input stream,and clinker(CK)and cement kiln dust(CKD)accounted for＞90％of the total chlorine output stream.Flue gas and CKD were the primary volatile heavy metal(Hg)output streams.Greater than 70％of the semi-volatile heavy metals(Cd,Pb,Tl and Se)distributed in hot raw meal and bypass cement kiln dust.The low-volatility heavymetals were concentrated in the CK.These results indicated that co-processing techniques used in China still require improvement.

Hua Long;Yang Liao;Changhao Cui;Meijia Liu;Zeiwei Liu;Li Li;Wenzheng Hu;Dahai Yan

State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610068,China;Zibo Environmental Pollution Prevention and Control Center,Zibo 255000,China

环境科学与工程前沿

[1]Hua Long;Yang Liao;Changhao Cui;Meijia Liu;Zeiwei Liu;Li Li;Wenzheng Hu;Dahai Yan-.Assessment of popular techniques for co-processing municipal solid waste in Chinese cement kilns)[J].环境科学与工程前沿,2022(04):139-151

dibenzofuran,heavymetals

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