Bacterial Metal Accumulation as a Strategy for Waste Recycling Management

IF 3.6 Q2 ENVIRONMENTAL SCIENCES

Resources Pub Date : 2023-12-08 DOI:10.3390/resources12120144

Denise Kölbi, Alma Memić, Holger Schnideritsch, Dominik Wohlmuth, Gerald Klösch, Mihaela Albu, Tetyana Milojevic

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引用次数: 0

Abstract

Sustainable mechanisms for efficient and circular metal recycling have yet to be uncovered. In this study, the metal recycling potential of seven metal-resistant bacterial species (Deinococcus radiodurans, Deinococcus aerius, Bacillus coagulans, Pseudomonas putida, Staphylococcus rimosus, Streptomyces xylosus and Acidocella aluminiidurans) was investigated in a multi-step strategy, which comprises bioleaching of industrial waste products and subsequent biosorption/bioaccumulation studies. Each species was subjected to an acidic, multi-metal bioleachate solution and screened for potential experimental implementation. Bacterial growth and metal acquisition were examined using scanning transmission electron microscopy coupled to electron dispersive X-ray spectroscopy (STEM-EDS). Two of the seven screened species, D. aerius and A. aluminiidurans, propagated in a highly acidic and metal-laden environment. Both accumulated iron and copper compounds during cultivation on a multi-metallic bioleachate. Our findings suggest that extremotolerant bacteria should be considered for waste recycling operations due to their inherent polyextremophily. Furthermore, STEM-EDS is a promising tool to investigate microbial–metal interactions in the frames of native industrial waste products. To develop further experimental steps, detailed analyses of adsorption/accumulation mechanisms in D. aerius and A. aluminiidurans are required to design a circular metal recycling procedure.

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细菌金属积累作为废物回收管理的一种策略

有效和循环金属回收的可持续机制尚未发现。在本研究中，研究了7种耐金属细菌(耐辐射球菌、aerinococcus、凝固芽孢杆菌、恶臭假单胞菌、葡萄球菌、木糖链霉菌和铝酸杆菌)的金属回收潜力，采用多步骤策略，包括工业废物的生物浸出和随后的生物吸附/生物积累研究。每个物种都受到酸性多金属生物浸出液溶液的影响，并对潜在的实验实施进行筛选。利用扫描透射电子显微镜结合电子色散x射线能谱(STEM-EDS)对细菌生长和金属获取进行了研究。在筛选的7种细菌中，有2种细菌(D. aerius)和a . aluminiidurans)在高酸性和富含金属的环境中繁殖。多金属生物渗滤液培养过程中铁和铜化合物的积累。我们的研究结果表明，由于其固有的多极端性，应该考虑极端耐受细菌进行废物回收操作。此外，STEM-EDS是一种很有前途的工具，用于研究原生工业废物框架中的微生物-金属相互作用。为了进一步发展实验步骤，需要详细分析白蛉和al - uminidurans的吸附/积累机制，以设计循环金属回收程序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resources Environmental Science-Nature and Landscape Conservation

CiteScore

7.20

自引率

6.10%

发文量

审稿时长

11 weeks

期刊介绍： Resources (ISSN 2079-9276) is an international, scholarly open access journal on the topic of natural resources. It publishes reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and methodical details must be provided so that the results can be reproduced. There are, in addition, unique features of this journal: manuscripts regarding research proposals and research ideas will be particularly welcomed, electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Subject Areas: natural resources, water resources, mineral resources, energy resources, land resources, plant and animal resources, genetic resources, ecology resources, resource management and policy, resources conservation and recycling.