Effect of low-intensity direct current electric field on microbial nitrate removal in coal pyrolysis wastewater with low COD to nitrogen ratio.
Effect of low-intensity direct current electric field on microbial nitrate removal in coal pyrolysis wastewater with low COD to nitrogen ratio.
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DOI：
10.1016/j.biortech.2019.121465
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发表时间：
2019-05
影响因子：
11.4
通讯作者：
Zhengwen Zhang;Yuxing Han;Chunyan Xu;Hong-jun Han;D. Zhong;Mengqi Zheng;Weiwei Ma
中科院分区：
文献类型：
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作者：
Zhengwen Zhang;Yuxing Han;Chunyan Xu;Hong-jun Han;D. Zhong;Mengqi Zheng;Weiwei Ma
构建了生物电化学与生物脱氮工艺（R1）耦合去除煤热解废水中硝酸盐的工艺，并研究了低强度直流电场对脱氮效果的影响。与对照反应器（R2）相比，优化电压为0.9 V时，R1的总氮（TN）去除率为94.20 ± 2.14%，比R2提高了14.42%。循环伏安法（CV）结果表明，R1阴极上的生物膜对硝酸盐还原有促进作用，而悬浮活性污泥中的细菌仅对亚硝酸盐有还原作用。微生物群落网络分析表明，假单胞菌的产电细菌在R1的阳极富集，在电压的刺激下建立了由动胶菌、假单胞菌和沙单胞菌组成的“小世界”。因此，假单胞菌将电子转移到阳极，而Arenimas则利用阳极的电子还原硝酸盐，从而提高了R1对TN的去除率。
The coupling of bioelectrochemical system with the biological denitrification process (R1) was constructed for nitrate removal in coal pyrolysis wastewater (CPW) and the effect of low-intensity direct current electric field was investigated. Compared with control reactor (R2), the total nitrogen (TN) removal efficiency in R1 at the optimized voltage of 0.9 V was 94.20 ± 2.14%, which was 14.42% higher than that in R2. The biofilm on the cathode of R1 enhanced the nitrate reducing, however, nitrite was only reduced by bacteria in suspended activated sludge, which was confirmed by cyclic voltammetry measurement (CV). Microbial community network analysis revealed that exoelectrogenic bacteria ofPseudomonaswas enriched on the anode of R1, and the “small world”, includingZoogloea,PseudomonasandArenimonas, was established under the stimulation of voltage. Therefore,Pseudomonastransferred electron to anode, andArenimonascould utilize electron from anode to reduce nitrate, which enhanced TN removal in R1.