Cross-Medium Control of Water and Soil Environmental Pollution in Watershed

Pollutants have complex source-sink relationships in water and soil environments at a catchment scale, and the transformation of pollutants in water and soil environments is primarily controlled by various water-soil interface processes. Therefore, the control of water and soil environmental pollution should consider water and soil environments as a whole, identify the real pollution source through cross-medium attribution analysis, and then control the pollution with cross-medium treatment. We first analyze the crossmedium migration processes of pollutants and the major influencing factors. Then we propose the principle and key process of crossmedium regulation, namely, cross-medium attribution identification and cross-medium treatment of water and soil environmental pollution. Moreover, we expound the important role of the processes of the following interfaces in cross-medium removal of pollutants: soil-water and slope-channel interfaces outside river channels, as well as water-sediment interface (including water-solid interfaces in the riverbed and lateral shore hyporheic zones) and water-suspended particulate matter interface in river channels. Furthermore, cross-medium control of non-point source pollutants in watershed, cross-medium removal of nitrogen-containing 收稿日期:2022-06-15;修回日期:2022-08-10 通讯作者:夏星辉,北京师范大学环境学院教授,研究方向为流域水土环境;E-mail: xiaxh@bnu.edu.cn 资助项目:国家重点研发计划项目(2017YFA0605001);中国工程院咨询项目“我国流域水污染防治战略的河长制建设研究”(2019-XZ-23); 国家自然科学基金项目(52039001) 本刊网址:www.engineering.org.cn/ch/journal/sscae