矿物载体锯末碳源低温生物修复硝酸盐污染地下水

研究了低温条件下,沸石和火山岩为载体,锯末为碳源的生物反应器对地下水中硝酸盐氮的去除效果。结果表明,在（14±1）℃,水力停留时间18 h,进水硝酸盐氮浓度为27 mg/L的条件下,以锯末为碳源能有效去除地下水中的硝酸盐,沸石为载体时对硝酸盐氮的平均去除率为98%;火山岩为载体时对硝酸盐氮的平均去除率为95%。实验过程中出现铵盐和亚硝酸盐的积累,出水中氨氮浓度为1～2.55 mg/L,亚硝酸氮浓度为0～0.98 mg/L。出水pH均介于7～8,满足饮用水标准中pH的要求（6.5～8.5）。

Denitrification of groundwater with carbon source sawdust and mineral fillings at low temperature

At low temperature, an experiment on biological denitrification of groundwater was conducted with sawdust as carbon source and mineral fillings in an upflow fixed-bed reactor. The removal efficiency of the nitrate nitrogen was analyzed. It was showed that the nitrate can be effectively removed in the reactor with sawdust when mineral filler existed. The nitrate nitrogen removal rate was 95% with the volcanic rock as the reaction medium;to zeolite, the nitrate nitrogen removal rate was 98%. Ammonia and nitrite could be found in the effluent. The concentration of ammonia nitrogen was fluctuated about 1 mg/L and the highest reached to 2.55 mg/L. The concentration of nitrite was changed between 0~0.98 mg/L. The pH of effluent was 7~8 which can meet the requirements of the potable water.