Authors: Tong Chen Mingxiu Zhan Xiaoqing Lin Jianying Fu Shengyong Lu Xiaodong Li
Publish Date: 2014/08/16
Volume: 22, Issue: 2, Pages: 1207-1214
Abstract
Distribution of polychlorinated dibenzopdioxins and furans PCDD/Fs in the fly ash and atmospheric air of one medical waste incinerator MWI and one industrial hazardous waste incinerator IHWI plants were characterized The PCDD/F concentrations of the stack gas fly ash produced from MWI and IHWI were 177 and 07 ng international toxic equivalent ITEQ/Nm3 41 and 25 ng ITEQ/g respectively For workplace air the total concentrations of PCDD/Fs were 1132 and 028 pg ITEQ/Nm3 8195 and 153 pg/Nm3 We assumed that the large differences of PCDD/F concentrations in workplace air were due to the differences in chlorine content of the waste combustion conditions and other contamination sources With respect to the homologue profiles the concentrations of PCDFs decreased with the increase of the substituted chlorine number for each site Among all of the PCDD/F congeners 23478PeCDF was the most important contributor to the ITEQ value accounting for ca 43 of two sites The gas/particle partition of PCDD/Fs in the atmosphere of the workplace in the MWI was also investigated indicating that PCDD/Fs were more associated in the particle phase especially for the higher chlorinated ones Moreover the ratio of the ITEQ values in particle and gas phase of workplace air was 110 At last the relationship between the distribution of PCDD/Fs in the workplace air and that from stack gas and fly ash was also analyzed and discussed The high correlation coefficient might be a sign for diffuse gas emissions at transient periods of fumes escaping from the incineratorFinancial support by the National High Technology Research and Development Key Program of China no 2012AA062803 the Major State Basic Research Development Program of China 973 Program no 2011CB201500 and the Fundamental Research Funds for the Central Universities no 2012QNA4009
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