Enhanced anammox-mediated nitrogen removal in bioelectrochemical systems at prolonged negative electrode potentials

被引：0

作者：

Institute of Technology, University of Tartu, 1 Nooruse St., Tartu ^{[1
]}

50411, Estonia

不详 ^{[2
]}

50411, Estonia

不详 ^{[3
]}

19086, Estonia

不详 ^{[4
]}

110 016, India

不详 ^{[5
]}

721302, India

机构：

[1] Institute of Technology, University of Tartu, 1 Nooruse St., Tartu

[2] Institute of Chemistry, University of Tartu, 14a Ravila St., Tartu

[3] Tallinn University of Technology, 5 Ehitajate St., Tallinn

[4] Indian Institute of Technology Delhi, Hauz Khas, New Delhi

[5] Indian Institute of Technology Kharagpur, Kharagpur

来源：

Environ. Sci. Pollut. Res. | / 54卷 / 63312-63324期

基金：

欧盟地平线“2020”;

关键词：

Anammox; Biocathode; Bioelectrochemical systems; Candidatus Brocadia; Electrostimulation; Nitrogen removal; Wastewater recycling;

D O I：

10.1007/s11356-024-35405-0

中图分类号：

学科分类号：

摘要：

Bioelectrochemical anaerobic ammonium oxidation (anammox) systems allow eco-friendly removal of nitrogen from reject wastewater coming from biogas processing as the anammox bacteria have previously shown to have c-type cytochromes acting in the extracellular electron transport (EET) mechanism between the bacteria and electrode. The anammoxosome compartment present in anammox bacteria features a highly curved membrane and contains tubular structures along with electron-dense particles that contain iron, which could enhance the process of EET and enhance nitrogen removal by properly applied potentials. In this study, nitrogen removal was investigated in the electrostimulated anammox nitrogen removal (EANR) cells operated comparatively at open circuit and at applied potentials of − 300 mV, − 500 mV, and − 700 mV vs. Ag/AgCl. At peak performance (at − 700 mV vs. Ag/AgCl), the EANR showed up to 140% higher specific nitrogen removal rate (11.2 ± 0.3 g N/m2/day) compared to the control reactors without applied potential (8.3 ± 0.2 g N/m2/day). The microbial community on the cathode with the applied potential had a higher relative proportion of unclassified Candidatus Brocadia (7.5%) compared to inoculum (> 0.01%), in contrast to cathode without potential (0.74%) and control (0.2%). The EANR system demonstrated to achieve ammonium and nitrite removal efficiencies of 91% and 53%, respectively, during a 24-h test cycle from an initial TN concentration of ~ 100 mg N/L. After 150 h, it achieved complete removal of all nitrogen compounds, reaching a 100% removal efficiency. The EANR would be very useful in the establishment of field-scale bilateral anammox-bioelectrochemical technology combining microbial fuel cell bioanodes and EANR biocathodes for wastewater treatment. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

引用

页码：63312 / 63324

页数：12

共 36 条

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