Microbial nitrate removal in biologically enhanced treated coal gasification wastewater of low COD to nitrate ratio by coupling biological denitrification with iron and carbon micro-electrolysis.
Microbial nitrate removal in biologically enhanced treated coal gasification wastewater of low COD to nitrate ratio by coupling biological denitrification with iron and carbon micro-electrolysis.
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DOI：
10.1016/j.biortech.2018.04.059
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发表时间：
2018-08
影响因子：
11.4
通讯作者：
Zhengwen Zhang;Yuxing Han;Chunyan Xu;Wencheng Ma;Hong-jun Han;Mengqi Zheng;Hao Zhu;Weiwei Ma
中科院分区：
文献类型：
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作者：
Zhengwen Zhang;Yuxing Han;Chunyan Xu;Wencheng Ma;Hong-jun Han;Mengqi Zheng;Hao Zhu;Weiwei Ma
混合营养反硝化-铁碳微电解（IC-ME）耦合生物反硝化是处理低COD /硝酸盐比生物强化煤气化废水（BECGW）的一种很有前途的新型生物脱硝工艺。IC-ME辅助下R1的TN去除率比添加废零价铁的R2高16.64%，比添加活性炭的R3高23.05%，比仅添加活性污泥的R4高30.51%，比单一IC-ME作为对照的R5高80.85%。IC-ME产生的Fe2+降低了N2O的产量，并富集了更多的硝酸还原铁（Ⅱ）氧化细菌（NRFOB）AcidovoraxandThiobacillus，这些细菌可以将硝酸盐转化为氮气。冗余分析表明，Fe3+作为Fe2+的氧化产物，可以促进铁（III）还原应变（FRB）的生长。微生物网络分析表明，frbgeothrix1与其他细菌共生，表明其主要参与BECGW的硝酸盐去除。
Mixotrophic denitrification coupled biological denitrification with iron and carbon micro-electrolysis (IC-ME) is a promising emerging bioprocess for nitrate removal of biologically enhanced treated coal gasification wastewater (BECGW) with low COD to nitrate ratio. TN removal efficiency in R1 with IC-ME assisted was 16.64% higher than R2 with scrap zero valent iron addition, 23.05% higher than R3 with active carbon assisted, 30.51% higher than R4 with only active sludge addition, 80.85% higher than R5 utilizing single IC-ME as control. Fe2+generated from IC-ME decreased the production of N2O and enriched more Nitrate-reducing Fe(Ⅱ) oxidation bacteria (NRFOB)AcidovoraxandThiobacillus, which could convert nitrate to nitrogen gas. And the presence of Fe3+, as the Fe2+oxidation product, could stimulate the growth of Fe(III)-reducing strain (FRB) that indicated by redundancy analysis. Microbial network analysis demonstrated FRBGeothrixhad a co-occurrence relationship with other bacteria, revealing its dominant involvement in nitrate removal of BECGW.