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Regional Control of Groundwater Nitrogen Contamination

CHEN Xin-ming;MA Teng;CAI He-sheng;WANG Yan-yan;School of Environmental Studies,China University of Geosciences;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences;  
About 110countries and regions are suffering from groundwater nitrogen pollution,which has become a global safe-drinking water problem.The characteristics of groundwater nitrogen pollution are as follows:it is non-point source pollution;the processes of formation is random and the influential factors are complex;it is widely distributed with large spatial and temporal differences in nitrogen pollution load;the transportation and transformation of nitrogen contaminants are involved complex nitrogen cycle;the final discharge causes or intensifies nitrogen contamination to surface water bodies.Therefore regional remediation of groundwater nitrogen contamination has currently been a global difficulty of academic research.This paper proposes the regional groundwater nitrogen contamination control strategy.Basing on the vulnerability of groundwater nitrogen contamination and the media of nitrate contamination,the prior control areas are determined and nitrate control quantity is decided.Thereafter,source reduction,leaching blockage and discharge control projects are carried out to realize the purpose of regional control.This study provides a novel way for regional remediation of groundwater nitrogen contamination and protection of the quality of surface water.
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