城市污水地下回灌中氮的迁移与预测

Transportation and Forecast of Nitrogen and Groundwater Recharge

摘要: 二级生化出水经深度处理后地下回灌是解决我国水资源短缺的有效途径之一。实验室结果表明 ,回灌过程中大部分NH₄⁺被吸附 ,15 %～ 43%的NH4+ 经过硝化作用转变成NO₃^{-^{,硝化作用在土壤表层进行。NO₃^-迁移模型预测 ,大部分NO₃^{-^{可穿过 8m的包气带到达含水层 ;在含水层中 ,通过反硝化作用 ,在离回灌区约 2 0 0m的地方 ,绝大多数NO₃^{-^{可被去除。}}}}}}

Abstract: Advanced treated secondary effluent used for groundwater recharge is an important approach to solve water shortage problems in China. The laboratory experiment results indicated that during the recharging process,most NH 4 + was adsorbed,15%～43% NH₄⁺ turned to NO₃^{-^{through nitrification.Nitrification was carried out at the surface layer of soil.The NO₃^{-^{transportation model predicts that large parts of NO₃^{-^{can pass the 8 m vadose zone and arrive at the aquifer,with the denitrification effect.A great part of NO₃^{-^{could be removed 200 m far away from the recharging point.}}}}}}}}