Adsorption and nitrogen removal of NH4+-N based on Mn (II)/α-MnO2 cycle in bio-electrochemical system

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-05-05 DOI:10.1016/j.biortech.2025.132628

Zhanping Cao, Li Yan, Xinyue Duan, Zhengran Li, Xingyue Wang

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Abstract

This paper developed a single-chamber α-MnO₂-coupled microbial electrolysis cell (α-MnO₂-MEC) system to enhance the oxidation denitrification rate of ammonia nitrogen (NH₄⁺-N) in order to overcome the electrode repulsion problem between NH₄⁺ and the anode. The α-MnO₂ material with an equilibrium adsorption capacity of 10.6 mg·g⁻¹ for NH₄⁺-N was developed. The removal rate of total nitrogen in the α-MnO₂-MEC reactor is 95.8 %, and NH₄⁺ oxidation efficiency is 100 % in 20 h, which is 78.7 % and 47.8 % higher than in the α-MnO₂ reactor and the MEC reactor, respectively. The Mn(II)/α-MnO₂ cycle was realized in α-MnO₂-MEC reactor, avoiding the loss of the Mn(II). The 16S rRNA gene sequencing identified key microbial genera involved in the ammonia removal are Candidatus_Brocadia, SC-I-84, and Thauera. This study demonstrates that combining α-MnO₂ with bioelectrochemistry provides a novel strategy for ammonia nitrogen wastewater treatment, offering a new insight for optimizing electrochemical-microbial coupled nitrogen removal.

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生物电化学系统中Mn (II)/α-MnO2循环对NH4+-N的吸附与脱氮

为了克服氨氮（NH4+-N）与阳极之间的电极斥力问题，研制了单室α- mno2偶联微生物电解池（α-MnO2-MEC）体系，提高氨氮（NH4+-N）的氧化反硝化速率。制备的α-MnO2材料对NH4+-N的平衡吸附容量为10.6 mg·g−1。α-MnO2-MEC反应器对总氮的去除率为95.8%，20 h内NH4+氧化效率为100%，分别比α-MnO2反应器和MEC反应器高78.7%和47.8%。在α-MnO2- mec反应器中实现了Mn(II)/α-MnO2循环，避免了Mn（II）的损失。16S rRNA基因测序鉴定出参与氨去除的关键微生物属为Candidatus_Brocadia、SC-I-84和Thauera。本研究表明，α-MnO2与生物电化学结合为氨氮废水处理提供了一种新的策略，为优化电化学-微生物耦合脱氮提供了新的思路。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.