Study on the variation law of nitrate pollution during the rise of groundwater level
LIU Xin1,2, ZUO Rui1,2, MENG Li1,2, LI Peng3, LI Zhi-ping3, HE Zhu-kun1,2, LI Qiao1,2, WANG Jin-sheng1,2
1. College of Water Sciences, Beijing Normal University, Beijing 100875, China; 2. Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, Beijing 100875, China; 3. Beijing Institute of Hydrogeology and Engineering Geology, Beijing 100195, China
Abstract：Rising groundwater levels will cause the input of exogenous pollutants, such as nitrate, in the vadose zone, and at the same time alter the shallow groundwater environment. In this study, we aimed to measure the effect of water level rise process on nitrate nitrogen (nitrate). Representative media were selected in Tongzhou District, Beijing, and an indoor sand tank experiment was established to simulate the migration and transformation of nitrate nitrogen during the groundwater level rise process. The experimental results show that as the groundwater level continues to rise, from the top to the bottom of the sand tank, and from the left side to the right side, both the dissolved oxygen and redox potential gradually decrease, and the groundwater gradually changes to the reducing environment. The shallow groundwater show the obvious characteristics of nitrate and ammonium stratification as a result of pollutants leaching into the vadose zone. The lower the burial depth, the higher the nitrate nitrogen and ammonium nitrogen content. There is also lateral runoff during the rise of the groundwater level, which is conducive to the migration of nitrate in groundwater. Along the direction of lateral water flow, there is a risk of increasing ammonium nitrogen. Therefore, the influence of groundwater level rise on nitrate nitrogen cannot be ignored.
刘鑫, 左锐, 孟利, 李鹏, 李志萍, 何柱锟, 李桥, 王金生. 地下水位上升过程硝态氮(硝酸盐)污染变化规律研究[J]. 中国环境科学, 2021, 41(1): 232-238.
LIU Xin, ZUO Rui, MENG Li, LI Peng, LI Zhi-ping, HE Zhu-kun, LI Qiao, WANG Jin-sheng. Study on the variation law of nitrate pollution during the rise of groundwater level. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 232-238.
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