{"title":"Study on the treatment of rural sewage with microbial fuel cell-constructed wetlands enhanced by agricultural biomass","authors":"Yuting Ma, Yutong Li, Mengni Tao, Shiwei Cao, Zhaoqian Jing","doi":"10.1016/j.jwpe.2024.106407","DOIUrl":null,"url":null,"abstract":"<div><div>In response to the low carbon-to‑nitrogen ratio of rural sewage after biological treatment, corn stalks, wheat straw, and rice straw were selected as additional carbon sources for the microbial fuel cell-constructed wetlands (MFC-CWs). Carbon release of the biomass was not improved obviously by NaOH pretreatment, and the removal efficiency of nitrate nitrogen from pretreated wheat straw (94.8 %) was only slightly higher than that of unpretreated straw (91.6 %). Therefore, to avoid secondary pollution caused by pretreatment, original corn stalks, wheat straw and rice straw were used as carbon sources for MFC-CWs. The concentration of chemical oxygen demand in effluent did not change obviously with the carbon sources addition, but the total nitrogen removal rates in MFC-CWs with corn stalks, wheat straw, and rice straw addition of 70 g/m<sup>2</sup> increased by 22.72 %, 16.17 % and 26.14 %, respectively. Additionally, the average output voltage increased by 12.19–33.19 mV with carbon sources addition, while the electricity generation decreased by 0.22–0.65 mW/m<sup>2</sup> after the carbon sources were removed. With the addition of biomass, abundant microorganisms associated with denitrification (<em>Cyanobacteria and unclassified_f__Rhodobacteraceae</em>), electricity generation (<em>Acidobacteriota and Proteobacteria</em>), and organic matter degradation (<em>Chloroflexi</em>, <em>Actinobacteriota</em>, and <em>Bacteroidota</em>) were observed in MFC-CWs. Therefore, the use of agricultural biomass to enhance the performance of MFC-CWs is a promising method for treating rural sewage.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":null,"pages":null},"PeriodicalIF":6.3000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714424016398","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In response to the low carbon-to‑nitrogen ratio of rural sewage after biological treatment, corn stalks, wheat straw, and rice straw were selected as additional carbon sources for the microbial fuel cell-constructed wetlands (MFC-CWs). Carbon release of the biomass was not improved obviously by NaOH pretreatment, and the removal efficiency of nitrate nitrogen from pretreated wheat straw (94.8 %) was only slightly higher than that of unpretreated straw (91.6 %). Therefore, to avoid secondary pollution caused by pretreatment, original corn stalks, wheat straw and rice straw were used as carbon sources for MFC-CWs. The concentration of chemical oxygen demand in effluent did not change obviously with the carbon sources addition, but the total nitrogen removal rates in MFC-CWs with corn stalks, wheat straw, and rice straw addition of 70 g/m2 increased by 22.72 %, 16.17 % and 26.14 %, respectively. Additionally, the average output voltage increased by 12.19–33.19 mV with carbon sources addition, while the electricity generation decreased by 0.22–0.65 mW/m2 after the carbon sources were removed. With the addition of biomass, abundant microorganisms associated with denitrification (Cyanobacteria and unclassified_f__Rhodobacteraceae), electricity generation (Acidobacteriota and Proteobacteria), and organic matter degradation (Chloroflexi, Actinobacteriota, and Bacteroidota) were observed in MFC-CWs. Therefore, the use of agricultural biomass to enhance the performance of MFC-CWs is a promising method for treating rural sewage.
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
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