A mini review on bio-electrochemical systems for the treatment of azo dye wastewater: State-of-the-art and future prospects. (May 2022)

• Record Type: Journal Article
• Authors: Sun, Liping; Mo, Yinghui; Zhang, Lu
• Is Part Of: Chemosphere. Volume 294(2022)
• Publication Date: 2022-05
• Subjects: Azo dyes -- Bio-electrochemical systems (BESs) -- Degradation mechanisms -- Microbial communities; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.133801
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Azo dyes are typical toxic and refractory organic pollutants widely used in the textile industry. Bio-electrochemical systems (BESs) have great potential for the treatment of azo dyes with the help of microorganisms as biocatalysts and have advanced significantly in recent years. However, the latest and significant advancement and achievements of BESs treating azo dyes have not been reviewed since 8 years ago. This review thus focuses on the recent investigations of BESs treating azo dyes from the year of 2013–2020 in order to broaden the knowledge and deepen the understanding in this field. In this review, azo dyes degradation mechanisms of BESs are first elaborated, followed by the introduction of BES configurations with the emphasis on the novelties. The azo dye degradation performance of BESs is then presented to demonstrate their effectiveness in azo dye removal. Effects of various operating parameters on the overall performance of BESs are comprehensively elucidated, including electrode materials, external resistances and applied potentials, initial concentrations of azo dyes, and co-substrates. Predominant microorganisms responsible for degradation of azo dyes in BESs are highlighted in details. Furthermore, the combination of BESs with other processes to further improve the azo dye removal are discussed. Finally, an outlook on the future research directions and challenges is provided from the viewpoint of realistic applications of the technology. Graphical abstract: Image 1 Highlights: Removal mechanisms of azo dyes in BESs are elucidated. Effects of parameters on azo dye removal in BESs are systematically reviewed. Predominant microbes responsible for azo dye degradation in BESs are highlighted. Combination of BESs and other processes is elaborated. Challenges and future research directions for BES development are proposed.