2022, Volume 24, Issue 5
Strategic Study of CAE >> 2022, Volume 24, Issue 5 doi: 10.15302/J-SSCAE-2022.05.007
Cross-Medium Control of Water and Soil Environmental Pollution in Watershed
1. School of Environment, Beijing Normal University, Beijing 100875, China;
2. Key Laboratory of Water and Sediment Science of Ministry of Education, Beijing 100875, China
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Abstract
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 and water-suspended particulate matter interfaces in river channels (including water-solid interfaces in the riverbed and lateral shore hyporheic zones). Furthermore, cross-medium control of non-point source pollutants in watershed, cross-medium removal of nitrogen-containing compounds from rivers, and cross-medium removal of nitrogen and phosphorus from lakes are illustrated with practical cases. The research results can provide a scientific basis for the control and treatment of water and soil pollution.
Keywords
watershed ; water and soil pollution control ; water and soil environment ; water-sediment interface ; water environment quality ; cross-medium treatment
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