Highly efficient nitrate reduction driven by an electrocoagulation system: An electrochemical and molecular mechanism.,Bioelectrochemistry

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Highly efficient nitrate reduction driven by an electrocoagulation system: An electrochemical and molecular mechanism.
Bioelectrochemistry ( IF 4.8 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.bioelechem.2019.107454
Mingrui Sui ₁ , Yue Dong ₁ , Peifang Wang ₁ , Yuhang Zhang ₁ , Xiao Tan ₁ , Yi Li ₁

Affiliation

Electrotrophic denitrification is suitable for nitrate removal in aqueous environments where bioavailable electron donors are limited such as in urban polluted water. Herein, a novel microbial denitrifying electrocoagulation cell (MDECC) with an Fe anode and an electrotrophic denitrifying biocathode was constructed. Nitrate reduction was verified relying solely on the electrons originated from the electrolysis process at the Fe anode. In situ generated coagulant at the anode was utilized to effectively flocculate and precipitate pollutants as well as naturally occurring components. Nitrate reduction by the biocathode showed pseudo-first-order kinetics with a maximum NO3--N removal rate of 67 ± 7 g m-3 d-1 and a total nitrogen (TN) removal rate of 39 ± 6 g m-3 d-1. Mechanistic research demonstrated that the system achieved highest current efficiency and denitrification enzyme activity at an initial NO3--N concentration (IC-N) of 100 mg L-1. Further pyrosequencing evidenced that higher initial NO3--N concentration increased the abundance of denitrifiers on biocathode. Correlation analysis indicated that nitrate reductase (NAR) and nitrite reductase (NIR) activities were crucial for NO3--N and TN removal. The metal anode was a promising alternative for providing electrons for electrotrophic denitrification and pollutant elimination.

中文翻译：

由电凝系统驱动的高效硝酸盐还原：一种电化学和分子机理。

对于在生物可利用的电子给体受到限制的水性环境（例如城市污水）中，电营养性反硝化适合去除硝酸盐。本文中，构建了具有Fe阳极和电营养性反硝化生物阴极的新型微生物反硝化电凝池（MDECC）。仅依靠Fe阳极电解过程中产生的电子来验证硝酸盐的还原。利用阳极处的原位产生的凝结剂有效地絮凝和沉淀污染物以及天然存在的成分。生物阴极还原硝酸盐显示拟一级动力学，最大NO3--N去除速率为67±7 g m-3 d-1，总氮（TN）去除速率为39±6 g m-3 d -1。机理研究表明，该系统在初始NO3--N浓度（IC-N）为100 mg L-1时达到了最高的电流效率和反硝化酶活性。进一步的焦磷酸测序表明，较高的初始NO3--N浓度会增加生物阴极上反硝化剂的含量。相关分析表明，硝酸还原酶（NAR）和亚硝酸还原酶（NIR）的活性对于去除NO3--N和TN至关重要。金属阳极是一种有希望的替代方法，可提供电子用于营养性反硝化和消除污染物。相关分析表明，硝酸盐还原酶（NAR）和亚硝酸盐还原酶（NIR）的活性对于去除NO3--N和TN至关重要。金属阳极是一种有前途的替代方法，可提供电子用于营养性反硝化和消除污染物。相关分析表明，硝酸盐还原酶（NAR）和亚硝酸盐还原酶（NIR）的活性对于去除NO3--N和TN至关重要。金属阳极是一种有前途的替代方法，可提供电子用于营养性反硝化和消除污染物。

更新日期：2020-01-09

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