氧微纳泡曝气降解垃圾填埋场复杂污染地下水中有机污染物的机理

IF 6.3 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of water process engineering Pub Date : 2024-11-30 DOI:10.1016/j.jwpe.2024.106635

Mei Bai , Yonggang Jia , Zhibin Liu , Haitao Yu , Changhui Gao , Zhu Liu

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引用次数: 0

摘要

垃圾填埋场复杂污染的地下水对健康构成重大威胁。氧微纳气泡（MNBO2）曝气技术有望修复这类复杂污染的地下水，但其降解污染物的机制尚不清楚。本研究从污染物降解过程及效率、溶解有机物（DOM）转化、酶活性和微生物等方面考察了MNB-O2曝气对垃圾填埋场复杂污染地下水中有机污染物的降解机理。试验结果表明，MNB-O2曝气105 d后，5 d生物需氧量、化学需氧量和α(254)的去除率分别为92.64%、50.56%和77.03%。此外，难降解的DOM增加了3% ~ 11%，而可生物降解的DOM减少了57.63%。MNB-O2曝气增强了土壤样品中好氧微生物的活性，但降低了土壤样品中微生物物种的多样性、均匀性和丰富度。此外，它还改变了土壤样品的微生物群落，增强了水样中有机物的氧化。MNB-O2曝气增强了水样的生物降解，其挥发性增强和强化学氧化作用也有助于水样中有机污染物的降解。本研究结果将为MNB-O2曝气技术在垃圾填埋场复杂污染地下水修复中的实际应用提供理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Degradation mechanism of organic contaminants in complex contaminated groundwater in landfill sites with oxygen micro-nano-bubbles aeration

查看原文本刊更多论文

Degradation mechanism of organic contaminants in complex contaminated groundwater in landfill sites with oxygen micro-nano-bubbles aeration

Complex contaminated groundwater in landfill sites poses a significant health threat. Oxygen micro-nano-bubbles (MNBO₂) aeration shows promise for remediation of such complex contaminated groundwater, while its mechanism for degradation contaminants remained unclear. This study investigated the degradation mechanism of organic contaminants in complex contaminated groundwater in landfill sites with MNB-O₂ aeration by contaminants degradation process and efficiency, dissolved organic matter (DOM) transformation as well as enzyme activity and microorganism. The test results indicated that after 105th day of MNB-O₂ aeration, the removal efficiencies of 5-day biological oxygen demand, chemical oxygen demand and α(254) in the water sample were 92.64 %, 50.56 % and 77.03 %, respectively. Additionally, the refractory DOM increased by 3 % to 11 %, while biodegradable DOM decreased by 57.63 %. MNB-O₂ aeration enhanced the activity of aerobic microorganisms but reduced the diversity, evenness and richness of microbial species in the soil sample. Moreover, it altered the microbial community of the soil sample and enhanced oxidation of organic substance in the water sample. MNB-O₂ aeration enhanced the biodegradation of the water sample, and its enhanced volatilization and strong chemical oxidation also contributed to organic contaminants degradation in the water sample. Collectively, the finding of this work will provide theoretical support for the practical application of MNB-O₂ aeration in remediation of complex contaminated groundwater in landfill sites.

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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