2020-02-03

Campaigns from 2008 to 2016 are carried out to study temporal variations and environmental impacts of polychlorinated dibenzopdioxin and dibenzofuran (PCDDFs) in soils in the vicinity of a new hazardous waste incinerator (HWI) in China. Results indicate that after 8year operation of HWI, the geometrical means of both the total concentrations and the TEQ values of PCDDFs in soils decrease from 1280 ngkg 1 and 3.08 ng WHOTEQkg 1 to 568 ngkg 1 and 2.70 ng WHOTEQkg 1 , respectively, showing generally limited impact on soils within 7.5 km. Temporal changes of PCDDFs congener profiles trend to profiles in combustion sources. Considering the whole studied area, results of principal component analysis between soils and emission sources show that instead of HWI, other sources including open burning, traffic, and cement plant are more responsible for PCDDFs accumulation. The modeling results of AERMOD indicate the dominant roles of wind velocities and directions on the deposition of PCDDFs emitted from HWI. The largest PCDDFs increase value in soils predicted by integrating AERMOD and a reservoir model is very limited after 25 years (2.03 10 5 ng WHOTEQkg 1 ), indicating relatively minor impacts of HWI on surrounding soils, but the noticeable impact on area downwind from the stack in short distance (e.g., within 0.5 km) should be recognized.

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