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Now showing items 1 - 4 of 4

  • Baseline soil levels of PCDD/Fs established prior to the construction of municipal solid waste incinerators in China.

    Liu HongMei   Lu ShengYong   Buekens, A. G.   Chen Tong   Li XiaoDong   Yan JianHua   Ma XiaoJun   Cen KeFa  

    In order to determine the baseline contamination by polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in different areas in China, prior to the construction of municipal solid waste incinerators (MSWIs), a total of 32 representative soil samples was collected near 16 incinerators and analyzed for their PCDD/F concentrations. The PCDD/F baseline concentrations in the soil samples ranged from 0.32 to 11.4 ng I-TEQ kg -1 (dry matter), with average and median value of 2.73 and 2.24 ng I-TEQ kg -1 (dry matter), respectively, and a span between maximum and minimum recorded value of 36. The PCDD homologues predominated in 26 out of 32 soil samples, with the ratio (PCDDs)/(PCDFs) ranging from 1.1 to 164; however in the other 6 samples, PCDF homologues were larger, with the same ratio varying from 0.04 to 0.8. Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were used to examine PCDD/F amount and profile in these soil samples, and their possible associations with known emission sources: in this process 6 really distinct isomer fingerprints were identified. Background PCDD/F levels and profiles were comparable to those found in soils from China and other countries and indicate a rather low baseline PCDD/F contamination of soils. The present data provide the tools for future assessment of a possible impact of these MSWIs.
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  • Photocatalytic decomposition of hexachlorobenzene on nano-titanium dioxide filmsExperimental study and mechanistic considerations

    Lu Shengyong   Wang Qiulin   Wu Di   Li Xiaodong   Yan Jianhua  

    The photocatalytic decomposition of hexachlorobenzene (HCBz) was studied in a laboratory-scale reactor on nano-titanium dioxide (TiO2) catalyst films in this study, and the effects of initial amount of HCBz dripped on the catalyst, UV light intensity, reaction time, and atmosphere (air and nitrogen) on photocatalytic decomposition efficiency (PDE) were investigated. Both increasing UV-light intensity and decreasing initial amount of HCBz remarkably promote PDE. The catalyst film thickness is theoretically calculated to be 76.9 m. Moreover, PDE is obviously higher in the air as carrier gas than in the nitrogen. Experimental data is confronted with tentative mechanism explanations to show the reaction mechanism: dechlorination and ring cleavage are the main pathways under aerobic and anaerobic conditions, respectively. Kinetic analysis is carried out to evaluate the effects of various parameters on reaction rates and find out that PDEs vary with reaction time according to first order kinetics. (c) 2012 American Institute of Chemical Engineers Environ Prog, 32: 458-464, 2013
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  • Photocatalytic decomposition of hexachlorobenzene on nano-titanium dioxide films—Experimental study and mechanistic considerations

    Lu Shengyong   Wang Qiulin   Wu Di   Li Xiaodong and Yan Jianhua  

    The photocatalytic decomposition of hexachlorobenzene (HCBz) was studied in a laboratory-scale reactor on nano-titanium dioxide (TiO2) catalyst films in this study, and the effects of initial amount of HCBz dripped on the catalyst, UV light intensity, reaction time, and atmosphere (air and nitrogen) on photocatalytic decomposition efficiency (PDE) were investigated. Both increasing UV-light intensity and decreasing initial amount of HCBz remarkably promote PDE. The catalyst film thickness is theoretically calculated to be 76.9 μm. Moreover, PDE is obviously higher in the air as carrier gas than in the nitrogen. Experimental data is confronted with tentative mechanism explanations to show the reaction mechanism: dechlorination and ring cleavage are the main pathways under aerobic and anaerobic conditions, respectively. Kinetic analysis is carried out to evaluate the effects of various parameters on reaction rates and find out that PDEs vary with reaction time according to first order kinetics.
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  • Photocatalytic decomposition of hexachlorobenzene on nano-titanium dioxide films—Experimental study and mechanistic considerations

    Lu Shengyong   Wang Qiulin   Wu Di   Li Xiaodong   Yan Jianhua  

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