Constructing soil cadmium discharge inventory for source analysis—a case study in copper smelter
SHENG Yi1, XUE Wei-zhen2, YING Di-wen2, WU Jun1, LI Ye3, SHI Pei-li4, ZHAO Ling2
1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; 2. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai 200241, China; 4. Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
Abstract：This study took a copper smelting plant in East China as an example, and used the “four emission pathways” functions to quantitatively describe the flux of Cd entering soil through “waste gas deposition, wastewater discharge, solid waste leaching, and run-off and leakage”. Combining the waste gas deposition model (AERMOD), the distribution of Cd carried by waste gas was calculated inside and outside the site boundary, and the contribution of each pathway to soil Cd pollution in the site was clarified. The results indicated that during the production period from 2000 to 2002, Cd was mainly emitted through waste gas deposition (1411kg, 50.05%) and solid waste leaching (1327kg, 47.05%), while the impact of wastewater and run-off as well as leakage pathways was small (a total of 81.74kg, 2.90%). However, only 0.68kg Cd in the waste gas was deposited inside the site, which only account for 0.05% of the overall Cd pollution in the soil of this site, while soil Cd in the site was mainly contributed by the solid waste leaching pathway. The spatial discharge inventory showed that soil Cd pollution was mainly distributed in production areas such as the stacking area and waste gas treatment area. The research results have important significance for strengthening the fine source control of the smelting industry, and the method proposed in this article can be extended to the source analysis of other industries and multiple pollutants.
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