氮素在包气带与饱水层迁移转化的实验研究

为研究浑河流域沈阳城区段岩土中氮污染物形态的区域特征，从模拟污染来源、污染途径和污染介质的差异着手，通过2个土柱的动态实验，观察含氨氮污水在经过地下包气带与饱水层时的不同转化过程. 依据研究区域水文地球环境化学特征，动态实验过程的监测指标包括氨氮，硝酸盐氮，亚硝酸盐氮，总铁，锰离子，高锰酸盐指数，pH，E_h值和ρ(DO)等. 结果表明:在土柱Ⅰ包气带通气性良好的环境中，硝酸盐氮是污染地下水的氮素主要存在形态；在土柱Ⅱ饱水岩层缺氧的还原性环境中，氨氮是污染地下水氮素的主要存在形态；区域水文地球化学场及其岩层的岩性决定了氮的存在形态. 

Study on Nitrogen Migration and Transformation in the Zone of Aeration and theZone of Saturation by Sand Column Experiments

The regional features of nitrogen pollutant form in rock and soil at Shenyang section of the Hunhe River Basin were discussed. In two sand column experiments, different transformation processes of ammonia nitrogen were observed by taking different polluting sources, ways and media into account in the zone ofaeration and the zone of saturation, respectively. According to the regional hydrogeochemical environmental characteristics, ammonia nitrogen, nitrate, nitrite, total iron, manganese ions, COD_Mn, pH, E_h and ρ(DO) were selected as the monitoring indexes in the dynamic lab-experiment. The result shows that nitrate nitrogen is the main form of nitrogen pollutant in the aeration zone of columnⅠwithaerobic condition, and ammonia nitrogen is the main form of nitrogen pollutant in the zone of saturation of columnⅡwith anoxic condition. The conclusion is that regional environmental hydrogeochemical field and the characteristics of saturated rock strata decide the main form of nitrogen pollutant.