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《GEOSCIENCE》 1998-03
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EFFECTS OF NITROGEN TRANSFORMATION ON HARDNESS INCREMENT OF GROUNDWATER

Wang Dongsheng(Institute of China Water and Hydropower, Beijing, 100044)Shen Zhaoli\ Zhong Zuoxin\ Chen Liang(China University of Geosciences, Beijing, 100083)  
Hardness increment of groundwater is a widespread environmental problem in urban areas of China. Investigation results show that high hardness regions of groundwater are distributed in space with high nitrate. With the help of laboratory and thermodynamic simulation, the relation of nitrogen transformation with calcium and magnesium variation during wastewater infiltration in soil water system is studied. The research results indicate that the nitrification makes the pH condition change and causes dissolution of some minerals bearing calcium and magnesium, like calcite and dolomite etc. in discontinuous infiltration condition and leads to the hardness increment of groundwater. And cation exchanges of calcium, magnesium and ammonium control the hardness increment of groundwater in continuous infitration condition.
【Fund】: 国家自然科学基金
【CateGory Index】: P641.3
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