Enhancing sulfate reduction in microbial electrolysis cells: The impact of intermittent electric field and extreme conditions on reaction mechanisms and functional genes
Zhibin Xia , Liang Qiao , Fei Chen , Xu Jiang , Pingting Li , Xing Zong , Yihan Wang , Feihong Wang , Luyan Zhang , Xiaolong Bai , Ye Yuan , Tianming Chen , Cheng Ding
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Abstract
This study investigated the regulation of sulfate reduction and mechanisms in Microbial Electrolysis Cells (MEC) under intermittent electric stimulation. The intermittent approach promoted the growth of sulfate-reducing bacteria and electroactive bacteria, improved electron transfer efficiency, and increased the abundance of functional genes associated with sulfate reduction, compared to continuous electric stimulation, the cysD and cysN, increased by 85.9 % and 66.2 %, respectively, resulting in significant sulfate reduction rate (29.03 mg/L·h). The microbial community under intermittent stimulation exhibited greater resilience to acidic stress and maintained higher metabolic activity by providing microbial recovery time through circuit disconnection by creating a biofilm thickness 1.7 times higher than continuous stimulation. Thus, Microorganisms have different electron transfer and reaction pathways. This research indicated that intermittent electric stimulation optimized the performance of MEC by promoting effective electron transfer and enhancing the adaptability of microbial communities, ultimately improving sulfate removal efficiency.
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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
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