Zero-valent iron boosts nitrate-to-ammonia bioconversion via extracellular electron donation and reduction pathway complementation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Jie Li
  • Xiao-Rong Yu
  • Yong-Kun Zhu
  • Hou-Qi Liu
  • Lin Chen
  • Jing Wu
  • Tian-Yin Huang
  • Wen-Wei Li

Detail(s)

Original languageEnglish
Article number106687
Journal / PublicationResources, Conservation and Recycling
Volume188
Online published7 Oct 2022
Publication statusPublished - Jan 2023

Abstract

Microbial nitrate reduction to ammonia (NRA) presents a promising route to recover wastewater nitrogen resources, but its practical application is currently challenged by limited bacterial activity and reaction selectivity. Here, we propose a facile strategy to boost microbial NRA by using zero-valent iron (ZVI) as an environmentally-benign augment. Unlike the previously reported hybrid systems that rely mainly on mediated electron transfer between ZVI and bacteria for enhanced denitrification, we revealed a combined pathway of direct and mediated electron transfer from ZVI to bacteria, along with a complementation between biological and abiotic nitrogen conversion processes, to promote the NRA process. The bio-hybrid exhibited over 13-fold higher NO3 reduction activity than the individual bacteria or ZVI groups, nearly 100% NRA selectivity, and good stability for treating real wastewater. Our work provides an efficient and scalable route to combine ammonia production with wastewater valorization, which may be readily incorporated into various wastewater treatment processes to maximize resource recovery.

Research Area(s)

  • Ammonia production, Direct electron transfer, Nitrate reduction, Shewanella oneidensis, Wastewater, Zero-valent iron

Citation Format(s)

Zero-valent iron boosts nitrate-to-ammonia bioconversion via extracellular electron donation and reduction pathway complementation. / Li, Xue; Li, Jie; Yu, Xiao-Rong et al.
In: Resources, Conservation and Recycling, Vol. 188, 106687, 01.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review