Microbial electrochemical Cr(VI) reduction in a soil continuous flow system

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Integrated Environmental Assessment and Management Pub Date : 2024-07-02 DOI:10.1002/ieam.4972

Gabriele Beretta, Michela Sangalli, Elena Sezenna, Anna Espinoza Tofalos, Andrea Franzetti, Sabrina Saponaro

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Abstract

Microbial electrochemical technologies represent innovative approaches to contaminated soil and groundwater remediation and provide a flexible framework for removing organic and inorganic contaminants by integrating electrochemical and biological techniques. To simulate in situ microbial electrochemical treatment of groundwater plumes, this study investigates Cr(VI) reduction within a bioelectrochemical continuous flow (BECF) system equipped with soil-buried electrodes, comparing it to abiotic and open-circuit controls. Continuous-flow systems were tested with two chromium-contaminated solutions (20–50 mg Cr(VI)/L). Additional nutrients, buffers, or organic substrates were introduced during the tests in the systems. With an initial Cr(VI) concentration of 20 mg/L, 1.00 mg Cr(VI)/(L day) bioelectrochemical removal rate in the BECF system was observed, corresponding to 99.5% removal within nine days. At the end of the test with 50 mg Cr(VI)/L (156 days), the residual Cr(VI) dissolved concentration was two orders of magnitude lower than that in the open circuit control, achieving 99.9% bioelectrochemical removal in the BECF. Bacteria belonging to the orders Solirubrobacteriales, Gaiellales, Bacillales, Gemmatimonadales, and Propionibacteriales characterized the bacterial communities identified in soil samples; differently, Burkholderiales, Mycobacteriales, Cytophagales, Rhizobiales, and Caulobacterales characterized the planktonic bacterial communities. The complexity of the microbial community structure suggests the involvement of different microorganisms and strategies in the bioelectrochemical removal of chromium. In the absence of organic carbon, microbial electrochemical removal of hexavalent chromium was found to be the most efficient way to remove Cr(VI), and it may represent an innovative and sustainable approach for soil and groundwater remediation. Integr Environ Assess Manag 2024;20:2033–2049. © 2024 The Author(s). Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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土壤连续流系统中的微生物电化学六价铬还原。

微生物电化学技术是污染土壤和地下水修复的创新方法，通过整合电化学和生物技术，为去除有机和无机污染物提供了一个灵活的框架。为了模拟地下水羽流的原位微生物电化学处理，本研究调查了装有土埋电极的生物电化学连续流（BECF）系统中六价铬的还原情况，并将其与非生物控制和开路控制进行了比较。用两种铬污染溶液（20-50 毫克六价铬/升）对连续流系统进行了测试。在系统测试期间，还引入了额外的营养物、缓冲剂或有机基质。在初始铬（VI）浓度为 20 毫克/升时，BECF 系统的生物电化学去除率为 1.00 毫克铬（VI）/（升/天），相当于在九天内去除 99.5%。在 50 毫克六价铬/升（156 天）的试验结束时，溶解的六价铬残留浓度比开路对照组低两个数量级，BECF 的生物电化学去除率达到 99.9%。土壤样本中的细菌群落以 Solirubrobacteriales、Gaiellales、Bacillales、Gemmatimonadales 和 Propionibacteriales 为特征；浮游细菌群落则以 Burkholderiales、Mycobacteriales、Cytophagales、Rhizobiales 和 Caulobacterales 为特征。微生物群落结构的复杂性表明，不同的微生物和策略参与了生物电化学除铬过程。研究发现，在没有有机碳的情况下，微生物电化学去除六价铬是最有效的去除六价铬的方法，它可能代表了一种创新的、可持续的土壤和地下水修复方法。Integr Environ Assess Manag 2024;00:1-17。© 2024 作者。综合环境评估与管理》由 Wiley Periodicals LLC 代表环境毒理学与化学学会 (SETAC) 出版。

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来源期刊

Integrated Environmental Assessment and Management ENVIRONMENTAL SCIENCESTOXICOLOGY&nbs-TOXICOLOGY

CiteScore

5.90

自引率

6.50%

发文量

156

期刊介绍： Integrated Environmental Assessment and Management (IEAM) publishes the science underpinning environmental decision making and problem solving. Papers submitted to IEAM must link science and technical innovations to vexing regional or global environmental issues in one or more of the following core areas: Science-informed regulation, policy, and decision making Health and ecological risk and impact assessment Restoration and management of damaged ecosystems Sustaining ecosystems Managing large-scale environmental change Papers published in these broad fields of study are connected by an array of interdisciplinary engineering, management, and scientific themes, which collectively reflect the interconnectedness of the scientific, social, and environmental challenges facing our modern global society: Methods for environmental quality assessment; forecasting across a number of ecosystem uses and challenges (systems-based, cost-benefit, ecosystem services, etc.); measuring or predicting ecosystem change and adaptation Approaches that connect policy and management tools; harmonize national and international environmental regulation; merge human well-being with ecological management; develop and sustain the function of ecosystems; conceptualize, model and apply concepts of spatial and regional sustainability Assessment and management frameworks that incorporate conservation, life cycle, restoration, and sustainability; considerations for climate-induced adaptation, change and consequences, and vulnerability Environmental management applications using risk-based approaches; considerations for protecting and fostering biodiversity, as well as enhancement or protection of ecosystem services and resiliency.