Su Jun Feng, Cheng Ce, Huang Tinglin, Wei Li
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Mar Pollut Bull. 2017 Apr 15;117(1-2):88-97. doi: 10.1016/j.marpolbul.2017.01.075. Epub 2017 Feb 1.
We used three stable reactors to investigate the rates of nitrate removal coupled with iron cycle and the subsequent influence of the reaction on bacterial communities. The iron-reducing bacterium Klebsiella sp. FC61 was immobilized on the reactor columns of the experimental groups B (only Klebsiella) and C (Klebsiella+magnetite). With the fluctuation of Fe to Fe3 (iron cycle), the average nitrate removal efficiency increased from 73.22% to 93.91% and 86.92% to 97.84% in groups B and C, respectively, as the influent nitrate concentration decreased from 40 to 10mg/L. However, the average rate of nitrate removal showed the opposite trend (from 2.08mg/L/h to 0.67mg/L/h and 2.41mg/L/h to 0.69mg/L/h in groups B and C, respectively) as the influent nitrate concentration decreased. Analysis of microbial distribution and community structures indicated that the population of Klebsiella sp. increased in groups B (from 18.21% to 41.21%) and C (from 25.43% to 46.80%) and contributed to the effective removal of nitrate in the reactors.
我们使用了三个稳定的反应器来研究硝酸盐去除速率与铁循环的耦合情况，以及该反应对细菌群落的后续影响。将铁还原菌克雷伯氏菌属FC61固定在实验组B（仅克雷伯氏菌）和C（克雷伯氏菌+磁铁矿）的反应器柱上。随着Fe到Fe3（铁循环）的波动，当进水硝酸盐浓度从40mg/L降至10mg/L时，B组和C组的平均硝酸盐去除效率分别从73.22%提高到93.91%和从86.92%提高到97.84%。然而，随着进水硝酸盐浓度降低，硝酸盐去除平均速率呈现相反趋势（B组分别从2.08mg/L/h降至0.67mg/L/h，C组从2.41mg/L/h降至0.69mg/L/h）。微生物分布和群落结构分析表明，B组（从18.21%增至41.21%）和C组（从25.43%增至46.80%）中克雷伯氏菌属的数量增加，并有助于反应器中硝酸盐的有效去除。
