{"title":"腐殖质还原菌驱动河流沉积物有机物降解的效应和机制","authors":"","doi":"10.1016/j.jwpe.2024.106150","DOIUrl":null,"url":null,"abstract":"<div><p>The reduction of organic pollutants in sediments is essential for controlling the rebound of black-odor waterbodies. Humic-reducing bacteria are promising in the anaerobic remediation of river sediments. However, the material conditions and environmental factors influencing organic matter (OM) degraded by humic-reducing bacteria in river sediment remain unclear. In this study, humic-reducing bacteria agents (HRBs) were used to remediate sediments with different contamination levels. The result indicated that HRBs remove light fraction organic matter (LFOM) in sediment with a high active organic matter (ATOM) content and can remove heavy fraction organic matter (HFOM) in sediment with a high degree of humification. Correlation analysis showed that OM removal was significantly correlated with fluorescein diacetate (FDA) hydrolase activity (<em>R</em> = 0.89, <em>P</em> ≤ 0.01) and acidified volatile sulfides (AVS) content (<em>R</em> = 0.81, <em>P</em> ≤ 0.05), respectively. Combined analyses of changes in iron morphology and FDA hydrolase activity revealed that HRBs mediated the reduction process of iron minerals, leading to an increase in Fe(II) content in sediment. HFOM complexed with iron minerals was released and could be further decomposed and utilized by FDA hydrolases. In addition, the process of OM degraded by HRBs can induce the accumulation of Fe(II) and AVS. The work helps to understand the mechanism of OM degraded by HRBs in sediment and the applicable conditions for the effective removal of OM by HRBs to control the rebound of black-odor waterbodies caused by endogenous pollution.</p></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":null,"pages":null},"PeriodicalIF":6.3000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The effects and mechanism of organic matter degradation in river sediment driven by humic-reducing bacteria\",\"authors\":\"\",\"doi\":\"10.1016/j.jwpe.2024.106150\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The reduction of organic pollutants in sediments is essential for controlling the rebound of black-odor waterbodies. Humic-reducing bacteria are promising in the anaerobic remediation of river sediments. However, the material conditions and environmental factors influencing organic matter (OM) degraded by humic-reducing bacteria in river sediment remain unclear. In this study, humic-reducing bacteria agents (HRBs) were used to remediate sediments with different contamination levels. The result indicated that HRBs remove light fraction organic matter (LFOM) in sediment with a high active organic matter (ATOM) content and can remove heavy fraction organic matter (HFOM) in sediment with a high degree of humification. Correlation analysis showed that OM removal was significantly correlated with fluorescein diacetate (FDA) hydrolase activity (<em>R</em> = 0.89, <em>P</em> ≤ 0.01) and acidified volatile sulfides (AVS) content (<em>R</em> = 0.81, <em>P</em> ≤ 0.05), respectively. Combined analyses of changes in iron morphology and FDA hydrolase activity revealed that HRBs mediated the reduction process of iron minerals, leading to an increase in Fe(II) content in sediment. HFOM complexed with iron minerals was released and could be further decomposed and utilized by FDA hydrolases. In addition, the process of OM degraded by HRBs can induce the accumulation of Fe(II) and AVS. The work helps to understand the mechanism of OM degraded by HRBs in sediment and the applicable conditions for the effective removal of OM by HRBs to control the rebound of black-odor waterbodies caused by endogenous pollution.</p></div>\",\"PeriodicalId\":17528,\"journal\":{\"name\":\"Journal of water process engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.3000,\"publicationDate\":\"2024-09-12\",\"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/S2214714424013825\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714424013825","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
摘要
减少沉积物中的有机污染物对控制黑臭水体的反弹至关重要。腐殖酸还原菌在河流沉积物的厌氧修复中大有可为。然而，影响腐殖酸还原菌降解河流沉积物中有机物（OM）的物质条件和环境因素仍不清楚。本研究使用腐殖酸还原菌剂（HRBs）修复不同污染程度的沉积物。结果表明，腐殖酸还原菌剂可去除活性有机物（ATOM）含量高的沉积物中的轻组分有机物（LFOM），并可去除腐殖化程度高的沉积物中的重组分有机物（HFOM）。相关分析表明，有机质去除率分别与二醋酸荧光素（FDA）水解酶活性（R = 0.89，P ≤ 0.01）和酸化挥发性硫化物（AVS）含量（R = 0.81，P ≤ 0.05）显著相关。铁形态变化和 FDA 水合酶活性的综合分析表明，HRBs 介导了铁矿物的还原过程，导致沉积物中铁（II）含量的增加。与铁矿物络合的 HFOM 被释放出来，并可被 FDA水解酶进一步分解和利用。此外，HRBs 降解 OM 的过程可诱导 Fe(II) 和 AVS 的积累。该研究有助于了解 HRBs 降解沉积物中 OM 的机理，以及 HRBs 有效去除 OM 的适用条件，从而控制内源污染导致的黑臭水体反弹。
The effects and mechanism of organic matter degradation in river sediment driven by humic-reducing bacteria
The reduction of organic pollutants in sediments is essential for controlling the rebound of black-odor waterbodies. Humic-reducing bacteria are promising in the anaerobic remediation of river sediments. However, the material conditions and environmental factors influencing organic matter (OM) degraded by humic-reducing bacteria in river sediment remain unclear. In this study, humic-reducing bacteria agents (HRBs) were used to remediate sediments with different contamination levels. The result indicated that HRBs remove light fraction organic matter (LFOM) in sediment with a high active organic matter (ATOM) content and can remove heavy fraction organic matter (HFOM) in sediment with a high degree of humification. Correlation analysis showed that OM removal was significantly correlated with fluorescein diacetate (FDA) hydrolase activity (R = 0.89, P ≤ 0.01) and acidified volatile sulfides (AVS) content (R = 0.81, P ≤ 0.05), respectively. Combined analyses of changes in iron morphology and FDA hydrolase activity revealed that HRBs mediated the reduction process of iron minerals, leading to an increase in Fe(II) content in sediment. HFOM complexed with iron minerals was released and could be further decomposed and utilized by FDA hydrolases. In addition, the process of OM degraded by HRBs can induce the accumulation of Fe(II) and AVS. The work helps to understand the mechanism of OM degraded by HRBs in sediment and the applicable conditions for the effective removal of OM by HRBs to control the rebound of black-odor waterbodies caused by endogenous pollution.
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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