Enhanced and sustainable high-level nitrate reduction in a membrane-less microbial fuel cell by watermelon rind fermentation broth

IF 6.7 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2025-10-06 DOI:10.1016/j.jwpe.2025.108859

Xulin Chen , Yunlong Yang , Jinkui Zhang , Han Wang , Hengzhuo Zhou , Jibo Xiao

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Abstract

This study developed a strategy for enhanced and sustainable high-level nitrate reduction in a membrane-less microbial fuel cell (MLMFC). We first optimized the fermentation procedure using response surface methodology and then made watermelon rind into fermentation broth (WRFB) in an anaerobic bioreactor. The major component in WRFB was lactic acid that was as high as 13.2 g/L. As electron donors for the nitrogen removal, WRFB was comparable to some traditional carbon sources. During the long-term operation of the MLMFC fueled by WRFB to reduce high levels of nitrate, the average removal efficiency for both COD and TN was higher than 95 %, and the greatest voltage attained 363 mV. Microbial diversity analysis demonstrated that apart from special microorganisms enriched on the anode (e.g. Methanosaeta) and cathode (e.g. Comamonas), some functional bacteria (Thauera and Desulfovibrio) predominated on both bioelectrodes, all of which contributed to an excellent performance of MLMFC. The strategy proposed in this work may considerably promote sustainable development of integrated watermelon rind recycling, high-level nitrate removal and electricity generation.

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西瓜皮发酵液在无膜微生物燃料电池中增强和可持续的高水平硝酸盐还原

本研究开发了一种在无膜微生物燃料电池（MLMFC）中增强和可持续的高水平硝酸盐还原策略。首先利用响应面法优化发酵工艺，然后在厌氧生物反应器中将西瓜皮制成发酵液（WRFB）。WRFB的主要成分为乳酸，含量高达13.2 g/L。作为脱氮的电子供体，WRFB的脱氮性能与传统碳源相当。在以WRFB为燃料的MLMFC长期运行过程中，COD和TN的平均去除率均高于95%，最高电压达到363 mV。微生物多样性分析表明，除了在阳极（如Methanosaeta）和阴极（如Comamonas）富集的特殊微生物外，一些功能细菌（Thauera和Desulfovibrio）在两个生物电极上都占主导地位，所有这些都有助于MLMFC的优异性能。本研究提出的策略可大大促进西瓜皮综合回收、高硝酸盐去除和发电的可持续发展。

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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