Silica-coated nano zero-valent iron as a slow-release electron donor for sustained enhancement of aerobic denitrification in oligotrophic source water: Performance and mechanism

被引：0

作者：

Wu, Tianhua ^{[1
,2
]}

Li, Jiaxin ^{[1
,2
]}

Cao, Ruihua ^{[1
,2
]}

Chen, Xiaojie ^{[1
,2
]}

Wang, Jingyi ^{[1
,2
]}

Cheng, Ya ^{[1
,2
]}

Wang, Baoshan ^{[4
]}

Huang, Tinglin ^{[1
,2
]}

Wen, Gang ^{[1
,2
,3
]}

机构：

[1] Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an

[2] Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an

[3] Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an

[4] College of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou

来源：

Science of the Total Environment | 2024年 / 956卷

基金：

中国国家自然科学基金;

关键词：

Aerobic denitrification; Continuous denitrification; Electron transfer; Nanoscale zero-valent iron; Silica coating;

D O I：

10.1016/j.scitotenv.2024.177429

中图分类号：

学科分类号：

摘要：

Limited organic carbon in drinking water constrains the removal of nitrate‑nitrogen (NO3−-N) via aerobic denitrification. This paper reports the use of silica-coated nano zero-valent iron (nZVI@SiO2) as a stable and sustainable electron donor to enhance aerobic denitrification. The nZVI@SiO2, synthesized via a one-step method, was resistant to oxidation and exhibited excellent stability. In conjunction with aerobic denitrifying bacteria, nZVI@SiO2 achieved NO3−-N and total nitrogen TN removal efficiencies of 90.64 % and 80.94 %, respectively. This represents an increase of 24.15 % in the efficiency of TN removal compared with that of the nZVI system. The activity of the nZVI system diminished gradually after just three cycles, whereas nZVI@SiO2 maintained NO3−-N and TN removal efficiencies of 89.33 % and 78.08 %, respectively, after four cycles, respectively, indicating its sustainable ability to enhance aerobic denitrification. Cyclic voltammetry and electrochemical impedance spectroscopy demonstrated enhanced electron transfer efficiency of nZVI@SiO2. Furthermore, nZVI@SiO2 significantly promoted the activity of the electron transfer system, ATP levels, nitrate/nitrite reductase activity, contents of complexes I and III, and extracellular polymeric substances. nZVI@SiO2 significantly enhanced electron generation, transfer, and consumption during biological denitrification by functioning as both an electron donor and mediator. The findings implicate nZVI@SiO2 as a means to enhance nitrogen removal by aerobic denitrifying microorganisms in oligotrophic water via sustained donation of electrons. © 2024 Elsevier B.V.

引用

共 56 条

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