{"title":"Alleviating acid stress in food waste anaerobic digestion by zero-valent iron and magnetite","authors":"Tugui Yuan , Wenxiang Zhang , Xuejiao Qiao , Qiyong Xu","doi":"10.1016/j.jwpe.2025.107185","DOIUrl":null,"url":null,"abstract":"<div><div>This investigation compared the roles of zero-valent iron (ZVI) and magnetite (Fe<sub>3</sub>O<sub>4</sub>) in food waste anaerobic digestion. The results showed that both additives enhanced greatly the CH<sub>4</sub> production rate and CH<sub>4</sub> yield, and ZVI had a better promoting effect. The addition of ZVI or Fe<sub>3</sub>O<sub>4</sub> reduced the lag phase of methanogenesis by 73.51 % and 54.22 %, respectively, and increased the maximum CH<sub>4</sub> production rate and CH<sub>4</sub> yield by 67.43 % and 24.39 %, 37.91 % and 12.86 %, respectively. The ZVI chemical corrosion and Fe<sub>3</sub>O<sub>4</sub> biochemical reduction played a key role in promoting AD performance. The additives promoted the activity of co-enzyme 420, thereby accelerating the CH<sub>4</sub> production. Additionally, the additives facilitate hydrolysis by improving the activities of the protease and α-amylase, thereby increasing the CH<sub>4</sub> yield. Compared with Fe<sub>3</sub>O<sub>4</sub>, ZVI had a better up-regulatory effect on key enzyme activities, resulting in higher CH<sub>4</sub> production rate and CH<sub>4</sub> yield. Fe<sub>3</sub>O<sub>4</sub> favoured the growth of <em>Syntrophomonadaceae</em> and <em>Methanosaeta</em>, whereas ZVI favoured the growth of more syntrophic bacteria (i.e., <em>Syntrophomonadaceae</em>, <em>Syntrophobacter</em>, and <em>Syntrophorhabdus</em>) and <em>Methanosarcina</em>. This study suggests that the ZVI is more attractive for enhancing industrial scale AD processes due to its superior performance, and greater abundance compared to Fe<sub>3</sub>O<sub>4</sub>.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"71 ","pages":"Article 107185"},"PeriodicalIF":6.3000,"publicationDate":"2025-02-13","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/S2214714425002570","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
This investigation compared the roles of zero-valent iron (ZVI) and magnetite (Fe3O4) in food waste anaerobic digestion. The results showed that both additives enhanced greatly the CH4 production rate and CH4 yield, and ZVI had a better promoting effect. The addition of ZVI or Fe3O4 reduced the lag phase of methanogenesis by 73.51 % and 54.22 %, respectively, and increased the maximum CH4 production rate and CH4 yield by 67.43 % and 24.39 %, 37.91 % and 12.86 %, respectively. The ZVI chemical corrosion and Fe3O4 biochemical reduction played a key role in promoting AD performance. The additives promoted the activity of co-enzyme 420, thereby accelerating the CH4 production. Additionally, the additives facilitate hydrolysis by improving the activities of the protease and α-amylase, thereby increasing the CH4 yield. Compared with Fe3O4, ZVI had a better up-regulatory effect on key enzyme activities, resulting in higher CH4 production rate and CH4 yield. Fe3O4 favoured the growth of Syntrophomonadaceae and Methanosaeta, whereas ZVI favoured the growth of more syntrophic bacteria (i.e., Syntrophomonadaceae, Syntrophobacter, and Syntrophorhabdus) and Methanosarcina. This study suggests that the ZVI is more attractive for enhancing industrial scale AD processes due to its superior performance, and greater abundance compared to Fe3O4.
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