摘要
由于地下水中溶解氧的约束与电子供体的缺乏,地下水硝酸盐污染的原位修复十分困难。论文通过实验室微元体、砂柱和含水砂槽实验研究,发现:乙醇作为电子供体,容易被普遍存在的反硝化菌利用,同时导致硝酸盐被快速去除,且没有亚硝酸盐积累;含水介质中的溶解氧对该过程影响是短暂的,有限的溶解氧被率先利用后,硝酸盐去除速率明显加快;乙醇不会被含水介质吸附,迁移能力强,其羽状体中溶解氧与硝酸盐通常是低浓度的,甚至是缺失的。用乙醇作为电子供体,促进地下水硝酸盐原位修复,投注简便,不要外来微生物接种,具有很强的可利用潜力。
It＇ s very prevalent that groundwater is polluted by nitrate. However, its remediation is also difficult because of the presence of oxygen and the absence of electron donor. In this paper, three experimental studies including microcosms, sand column and sand tank, were introduced. Their results showed that ethanol used as electron donor could largely stimulate the bioremoval of nitrate in groundwater. Because dissolved oxygen （DO） was usually limited in groundwater, the impact of DO on the rate of denitrification was short-lived. Actually, both DO and nitrate in the center of ethanol plume were often below detection. As ethanol can be used by many indigenous microorganisms with high biochemical oxygen demand, and it is miscible and unretarded in water, the use of ethanol as electron donor in the nitrate-contaminated groundwater bioremediation has high availability.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2011年第8期1446-1452,共7页
Journal of Natural Resources
基金
国家自然科学基金项目((40672200)
岩溶动力学重点实验室项目(桂科能0842008之kdl2008-11)
关键词
地下水
硝酸盐污染
原位
生物去除
乙醇
groundwater
nitrate pollution
in situ
bioremoval
ethanol
