还原铁粉反应柱去除地下水中硝酸盐氮的研究

Removal of Nitrate in Groundwater by Zero- Valent Iron Packed Columns

利用还原铁粉反应柱初步研究了对影响硝酸盐氮去除的反应因素,讨论了初始pH值和溶解氧对反应的影响,并研究了柱子的运行周期和对实际地下水的处理效果。结果表明,酸度是影响反应的主要因素,初始pH为2时,去除率可达到90%以上;溶解氧对硝酸盐氮的去除没有太大影响。该反应柱处理实际地下水也达到了较好的去除效果。

Groundwater polluted by nitrate has become a serious problem, and more attentions have been paid to methods of nitrate remediation. In this paper, factors affecting removal of nitrate were studied by continuous- flow zero- valent iron packed columns, such as pH and dissolved oxygen. The operation term of the column and the treatment of groundwater were researched. The results showed that nitrate removal strongly depended on initial pH value. Decreasing the initial pH resulted in increasing nitrate removal, and the removal rate of nitrate was high up to more than 90% when initial pH value was 2. Meanwhile, dissolved oxygen did not inhibit nitrate removal. It has been indicated that application of the method by the iron packed column can successfully remove the nitrate pollution in groundwater.