渗透性反应墙去除地下水中硝酸盐的试验研究

摘要

To provide a cost-effective method for the remediation of nitrate-polluted groundwater,at the suitable temperature, column experiments were performed to study the removal of nitrate by permeable reactive barrier filled with the mixed carbon source. The results show that under 30℃passing into the nitrate concentration of 65 mg/L in groundwater, with a mixture of sawdust and corn stalks as carbon, zeolite as a further repair response can effectively simulate nitrate of groundwater. In the running time of 15 d, with the combined reactor, the removal rate of nitrate in groundwater is more than 90%. During the test, the accumulation of nitrite and ammonia occurs, the concentration of ammonia nitrogen was fluctuated in the 0.02~0.12 mg/L, and the concentration of nitrite was changed between 0.7~2.5 mg/L. The effluent pH was 6.7~7.7.%通过柱试验模拟地下水环境，研究了在最适温度条件下，利用混合碳源为介质的生物反应墙与模拟沸石墙串联的组合反应器，考察其对地下水中硝酸盐氮的去除效果，为受硝酸盐污染的地下水提供经济有效的修复方法.结果表明，在30℃条件下，通入硝态氮浓度为65 mg/L的地下水，以锯末和玉米秸秆的混合物作为碳源，沸石作为进一步的修复反应能有效的去除模拟地下水中的硝酸盐.在15 d的运行时间内，模拟装置对水中的硝态氮去除率为90%以上，试验过程中出现亚硝酸盐和氨氮的积累，其中出水中亚硝酸盐氮浓度为0.020～0.120 mg/L，氨氮浓度为0.7～2.5 mg/L，出水pH值介于6.7～7.7之间.