Microbial degradation of dyes: An overview.
TL;DR: Scientific and technical information about dyes & dye intermediates and biodegradation of azo dye is provided and role of genetically modified organisms (GMOs) in process of dye degradation and perspectives in this field of research are compiled.
About: This article is published in Bioresource Technology.The article was published on 2020-06-28 and is currently open access. It has received 251 citations till now.
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TL;DR: In this article, the most advanced and state-of-art technical and scientific developments about the treatment of dye industry wastewater, which include advanced oxidation process, membrane filtration technique, microbial technologies, bio-electrochemical degradation, photocatalytic degradation, etc.
Abstract: Rapid industrialization has provided comforts to mankind but has also impacted the environment harmfully. There has been severe increase in the pollution due to several industries, in particular due to dye industry, which generate huge quantities of wastewater containing hazardous chemicals. Although tremendous developments have taken place for the treatment and management of such wastewater through chemical or biological processes, there is an emerging shift in the approach, with focus shifting on resource recovery from such wastewater and also their management in sustainable manner. This review article aims to present and discuss the most advanced and state-of-art technical and scientific developments about the treatment of dye industry wastewater, which include advanced oxidation process, membrane filtration technique, microbial technologies, bio-electrochemical degradation, photocatalytic degradation, etc. Among these technologies, microbial degradation seems highly promising for resource recovery and sustainability and has been discussed in detail as a promising approach. This paper also covers the challenges and future perspectives in this field.
277 citations
TL;DR: In this paper, the authors focused on synthetic dyes and their negative impacts on the ecosystem (soil, plants, water and air) and on humans, and discussed the applied physical, chemical and biological strategies solely or in combination for textile dye wastewater treatments.
Abstract: Natural dyes have been used from ancient times for multiple purposes, most importantly in the field of textile dying. The increasing demand and excessive costs of natural dye extraction engendered the discovery of synthetic dyes from petrochemical compounds. Nowadays, they are dominating the textile market, with nearly 8 × 105 tons produced per year due to their wide range of color pigments and consistent coloration. Textile industries consume huge amounts of water in the dyeing processes, making it hard to treat the enormous quantities of this hazardous wastewater. Thus, they have harmful impacts when discharged in non-treated or partially treated forms in the environment (air, soil, plants and water), causing several human diseases. In the present work we focused on synthetic dyes. We started by studying their classification which depended on the nature of the manufactured fiber (cellulose, protein and synthetic fiber dyes). Then, we mentioned the characteristics of synthetic dyes, however, we focused more on their negative impacts on the ecosystem (soil, plants, water and air) and on humans. Lastly, we discussed the applied physical, chemical and biological strategies solely or in combination for textile dye wastewater treatments. Additionally, we described the newly established nanotechnology which achieves complete discharge decontamination.
162 citations
TL;DR: A review of the most recent developments in the use of biological based techniques to remove dyes and heavy metals from wastewater is presented in this article, where various microorganisms such as algae, bacteria, fungi and enzymes are depicted in detail.
114 citations
TL;DR: A review of the most recent developments in the use of biological based techniques to remove dyes and heavy metals from wastewater is presented in this paper , where the remediation of dyes by diverse microorganisms such as algae, bacteria, fungi and enzymes are depicted in detail.
114 citations
TL;DR: The history of colour is fascinating from a social and artistic viewpoint because it shows the way; use; and importance acquired as mentioned in this paper, and the use of colour has contributed to the social and symbolic development of civilizations.
Abstract: The history of colour is fascinating from a social and artistic viewpoint because it shows the way; use; and importance acquired. The use of colours date back to the Stone Age (the first news of cave paintings); colour has contributed to the social and symbolic development of civilizations. Colour has been associated with hierarchy; power and leadership in some of them. The advent of synthetic dyes has revolutionized the colour industry; and due to their low cost; their use has spread to different industrial sectors. Although the percentage of coloured wastewater discharged by the textile; food; pharmaceutical; cosmetic; and paper industries; among other productive areas; are unknown; the toxic effect and ecological implications of this discharged into water bodies are harmful. This review briefly shows the social and artistic history surrounding the discovery and use of natural and synthetic dyes. We summarise the environmental impact caused by the discharge of untreated or poorly treated coloured wastewater to water bodies; which has led to physical; chemical and biological treatments to reduce the colour units so as important physicochemical parameters. We also focus on laccase utility (EC 1.10.3.2), for discolouration enzymatic treatment of coloured wastewater, before its discharge into water bodies. Laccases (p-diphenol: oxidoreductase dioxide) are multicopper oxidoreductase enzymes widely distributed in plants, insects, bacteria, and fungi. Fungal laccases have employed for wastewater colour removal due to their high redox potential. This review includes an analysis of the stability of laccases, the factors that influence production at high scales to achieve discolouration of high volumes of contaminated wastewater, the biotechnological impact of laccases, and the degradation routes that some dyes may follow when using the laccase for colour removal
105 citations
References
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TL;DR: An overview of methods for wastewater treatment, and the advantages and disadvantages of available technologies can be found in this article, where the authors provide an overview of the available technologies and their performance characteristics.
Abstract: During the last 30 years, environmental issues about the chemical and biological contaminations of water have become a major concern for society, public authorities and the industry. Most domestic and industrial activities produce wastewaters containing undesirable toxic contaminants. In this context, a constant effort must be made to protect water resources. Current wastewater treatment methods involve a combination of physical, chemical and biological processes, and operations to remove insoluble particles and soluble contaminants from effluents. This article provides an overview of methods for wastewater treatment, and describes the advantages and disadvantages of available technologies.
1,300 citations
TL;DR: In this article, the main effects of the release of industrial dyes and the essential bioremediation mechanisms are reviewed and a sustainable solution that provides a fundamental and innovative contribution to conventional physicochemical treatments is proposed.
1,164 citations
TL;DR: An overview about bioremediation for petroleum hydrocarbon pollutants and explanation about hydrocarbon metabolism in microorganisms are provided with a special focus on new insights obtained during past couple of years.
794 citations
"Microbial degradation of dyes: An o..." refers background in this paper
...Environment is adversely affected by pollution which may cause indirect or direct health risks to all life forms on the earth (Varjani, 2017; Bencheqroun et al., 2019)....
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TL;DR: The main conclusion can be drawn is that a degradation trend of drinking water quality in the context of climate change leads to an increase of at risk situations related to potential health impact.
777 citations
TL;DR: In this article, the authors discuss comprehensively the science and arts of biodegradation of synthetic dyes and discuss the potential of many microbes for synthetic dye-containing effluents.
Abstract: The contamination of soils and waters by dye-containing effluents is of environmental concern. Due to the increasing awareness and concern of the global community over the discharge of synthetic dyes into the environment and their persistence there, much attention has been focused on the remediation of these pollutants. Among the current pollution control technologies, biodegradation of synthetic dyes by different microbes is emerging as an effective and promising approach. The bioremediation potentials of many microbes for synthetic dyes have been demonstrated and those of others to be explored in future. The biodegradation of synthetic dyes is an economic, effective, biofriendly, and environmentally benign process. Bioremediation of xenobiotics including synthetic dyes by different microbes will hopefully prove a green solution to the problem of environmental soil and water pollution in future. This review paper discusses comprehensively the science and arts of biodegradation of synthetic dyes.
584 citations
"Microbial degradation of dyes: An o..." refers background or methods in this paper
...Under anaerobic condition and with help of azoreductase, microorganisms degrade azo dyes and as end product they form colorless aromatic amines (Ali, 2010; Ajaz et al., 2020; Dong et al., 2019)....
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...Various microorganisms such as bacteria, fungi, yeast and algae were used for dye degradation and decolorization (Ali, 2010; Ajaz et al., 2020)....
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...Benzidine is generally used in construction of direct azo dyes and has been reported as potential carcinogen (Dewan et al., 1988; Ali, 2010; Sen et al., 2016)....
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...This is due to existence of pollutant(s) like 4-amino biphenyl and 2–4, diaminoazobenzene, which have been reported as carcinogens (Dewan et al., 1988; Ali, 2010; Bencheqroun et al., 2019)....
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