Spatial distribution characteristics of heavy metals in the soil-groundwater system around an integrated waste management facility
ZHU Shui1, SHEN Ze-Liang1, WANG Yuan1, WU Hao-Ran1, XIN Jia1,2,3
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; 2. The Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; 3. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering(MEGE), Qingdao 266100, China
Abstract：The concentrations of heavy metals (Cr, Cu, Ni, Pb, Zn, As, Cd, and Hg) in the soil-groundwater system around an integrated waste management facility were determined. The results showed that an obvious vertical migration of heavy metals was observed with the highest concentration levels found at the depth of 150~200cm, which was attributed to the convection and diffusion of soil water and the adsorption and interception of the soil media. In spite of clues for heavy metals accumulation in the soil, the concentrations of heavy metals were lower than the critical limit of national soil quality standard. In soil samples, the contents of heavy metals at the upstream site were higher than those of the other two closer downstream sites, which was mainly caused by atmospheric deposition. In groundwater samples, the values of Zn and Ni adjacent to the integrated waste management facility were significantly higher that those at other further sites and the content of Zn even exceeded the groundwater quality standard, which was contributed by the infiltration of landfill leachate. Through high-throughput sequencing analysis, significant differences were found between soil and groundwater samples (P<0.01) in terms of microbial community structure:there was no significant correlation between most microbial communities in the soil and heavy metals, while the microbial community in groundwater was closely related with the enrichment of heavy metals Zn and Ni. These results would be helpful to assess and manage the environmental risks of the soil-groundwater system adjacent to the integrated waste management facility.
朱水, 申泽良, 王媛, 吴浩然, 辛佳. 垃圾处理园区周边土壤-地下水重金属分布特征[J]. 中国环境科学, 2021, 41(9): 4320-4332.
ZHU Shui, SHEN Ze-Liang, WANG Yuan, WU Hao-Ran, XIN Jia. Spatial distribution characteristics of heavy metals in the soil-groundwater system around an integrated waste management facility. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4320-4332.
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