%0 Journal Article
%T Reducing nitrate in groundwater by denitrifying bacteria combined with nanoiron-based materials<br>纳米铁系材料与反硝化细菌复合去除地下水硝酸盐氮研究
%A Xia Hong-Cai
%A Jin zhao hui
%A <br>夏宏彩
%A 金朝晖
%A 李铁龙
%A 东美英
%A 安毅
%J 环境科学学报
%D 2010
%I 
%X Three nanoiron-based particles, Fe, Fe/Ni and sodium oleate-coated Fe, were synthesized by liquid-phase reduction methods and then integrated with denitrifying bacteria to remove nitrate from groundwater. Batch experiments were carried out to examine the removal rate of nitrate and the final nitrogen transfomation products in these particle-bacteria systems. Also, the total RNA content in these systems was measured to evaluate the toxicity of nanoiron-based particles on the integrated bacteria. The results showed that almost 100% removal of nitrate was reached within 6 days in the Fe/Ni nanoparticle-bacteria system, and the ratio of ammonium to TN was 69% in the final products. Both nano-scale Fe and sodium oleate-coated Fe particle-bacteria systems took 9 days to complete 100% removal of nitrate, producing 52% and 16% ammonium, respectively. The total RNA of the integrated bacteria decreased in content by 93%, 40% and 34% in the Fe/Ni, Fe and sodium oleate-coated Fe nanoparticle-bacteria systems respectively, which suggested the toxicity of these nanoparticles to denitrifying bacteria should be in the sequence: nano-scale Fe/Ni > nano-scale Fe > sodium oleate-coated Fe.
%K groundwater
%K nitrate
%K nano-scale Fe
%K nano-scale Fe/Ni
%K sodium oleate-coated Fe
%K denitrifying bacteria<br>地下水
%K 硝酸盐氮
%K 纳米Fe
%K 纳米Fe/Ni
%K 油酸钠包覆型纳米Fe
%K 反硝化细菌
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=B4A5AF55690E5523296CE0CDF949F886&yid=140ECF96957D60B2&vid=340AC2BF8E7AB4FD&iid=59906B3B2830C2C5&sid=E2AE6FE010839FF3&eid=BB16B2E6715919D5&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=1&reference_num=0