The effective removal of Sb(V) by bio-electrochemical systems: Performance and mechanism

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-04-17 DOI:10.1016/j.jwpe.2025.107742

Mengqiao Luo , Lei Tang , Lei Fang , Yongchao Zhou , Yiping Zhang

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Abstract

Recently, Antimony (Sb) pollution in wastewater is a global environmental issue. The bio-electrochemical system (BES) converts Sb(V) to less toxic Sb(III) via microbial electrochemical processes. In this study, the effect factors of Sb(V) removal by BES are explored and the removal mechanism by BES is clarified. Results show that under acidic conditions, the removal rate of Sb(V) was 100 %, which is far more than its removal efficiency under a neutral condition. Sulfide concentration critically regulates efficiency: levels >8.5 mg L⁻¹ inhibit removal, while <6 mg L⁻¹ promote it via H₂SbS₄⁻ formation, linked to sulfate-reducing bacteria (SRB) metabolizing S²⁻. Furthermore, the mechanism of bio-electrochemical system (BES) reactor was further clarified by 16 s rRNA high-throughput sequencing. There are three types of bacteria play an important role in the removal of Sb from BES. ARB can reduce directly Sb(V) to sediment (i.e. Sb₂O₃, Sb(OH)₃) in BES, respectively. Electrochemically active bacteria (EAB) can transfer electrons to Sb(V) in solution by graphite electrodes and promote the reduction in BES. And SRB can use organic matter as electron donor to reduce SO₄²⁻ to S²⁻ in respiratory metabolism process. Electric fields can stimulate parts of microbial activities, so that it can improve the removal efficiency of Sb(V). Sb of the wastewater are removed by antimony-reducing bacteria, sulfide reduction, and electrochemistry combined with microbial reduction. Therefore, BES have a good performance in the removal of Sb(V) in acidic wastewater. This study presents a novel method for treating Sb(V), which is more sustainable compared to traditional chemical approaches.

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生物电化学系统对Sb(V)的有效去除：性能与机理

近年来，废水中的锑污染已成为一个全球性的环境问题。生物电化学系统（BES）通过微生物电化学过程将Sb(V)转化为毒性较小的Sb（III）。本研究探讨了BES去除Sb(V)的影响因素，阐明了BES去除Sb(V)的机理。结果表明，在酸性条件下，对Sb(V)的去除率为100%，远高于中性条件下的去除率。硫化物浓度对脱硫效率有重要的调节作用：8.5 mg L - 1水平抑制脱硫，而6 mg L - 1水平通过H₂SbS₄−的形成促进脱硫，这与硫酸盐还原菌（SRB）代谢S2−有关。此外，通过16s rRNA高通量测序进一步阐明了生物电化学系统（BES）反应器的作用机理。有三种类型的细菌在BES中去除Sb的过程中起重要作用。在BES中，ARB可直接将Sb(V)还原为沉积物（Sb2O3, Sb(OH)3）。电化学活性细菌（EAB）可以通过石墨电极将电子转移到溶液中的Sb(V)上，促进BES的还原。在呼吸代谢过程中，SRB可以利用有机物作为电子供体将SO42−还原为S2−。电场可以刺激部分微生物的活动，从而提高Sb(V)的去除效率。采用锑还原菌、硫化物还原、电化学与微生物还原相结合的方法去除废水中的锑。因此，BES对酸性废水中Sb(V)的去除效果较好。本研究提出了一种新的处理Sb(V)的方法，与传统的化学方法相比，该方法更具可持续性。

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来源期刊

Journal of water process engineering Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

10.70

自引率

8.60%

发文量

846

审稿时长

24 days

期刊介绍： The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies