Decolorization and biodegradation of reactive sulfonated azo dyes by a newly isolated Brevibacterium sp. strain VN-15

Abstract

Azo dyes constitute the largest and most versatile class of synthetic dyes used in the textile, pharmaceutical, food and cosmetics industries and represent major components in wastewater from these industrial dying processes. Biological decolorization of azo dyes occurs efficiently under low oxygen to anaerobic conditions. However, this process results in the formation of toxic and carcinogenic amines that are resistant to further detoxification under low oxygen conditions. Moreover, the ability to detoxify these amines under aerobic conditions is not a wide spread metabolic activity. In this study we describe the use of Brevibacterium sp. strain VN-15, isolated from an activated sludge process of a textile company, for the sequential decolorization and detoxification of the azo dyes Reactive Yellow 107 (RY107), Reactive Black 5 (RB5), Reactive Red 198 (RR198) and Direct Blue 71 (DB71). Tyrosinase activity was observed during the biotreatment process suggesting the role of this enzyme in the decolorization and degradation process, but no-activity was observed for laccase and peroxidase. Toxicity, measured using Daphnia magna, was completely eliminated.

Improvement of methyl orange dye biotreatment by a novel isolated strain, Aeromonas veronii GRI, by SPB1 biosurfactant addition

“…Similar results were also reported for the biodegradation of sulfonated azo dye by Brevibacterium sp. (Franciscon et al 2012), of methyl red by Sphingomonas paucimobilis (Ayed et al 2011), and of mono-azo dye Amaranth by Acinetobacter calcoaceticus (Ghodake et al 2011). However, many reports described the adsorptive removal of azo dye using bacteria and fungi (Das et al 2012;Selvam and Shanmuga Priya 2012).…”

“…Thus, a wide range of bacteria able to decolorize azo dyes, including Grampositive and Gram-negative bacteria (Asad et al 2007;Kalme et al 2007;Ayed et al 2011;Ghodake et al 2011;Franciscon et al 2012), fungi Kumar Praveen and Sumangala 2012;Gopinath et al 2013), and yeast Tastan et al 2010) were isolated. Mixed fungalbacterial consortia were also described for azo dye biodegradation (Lade et al 2012).…”

Efficient sorption and photocatalytic degradation of malachite green dye onto NiS nanoparticles prepared using novel green approach

“…The synthetic azo dyes consisting of aromatic rings are inert and non-biodegradable [1] and have been considered as carcinogenic as they harbor azo bonds nitro-or amino-groups [2,3]. Approximately 70% of the dyes are aromatic azo compounds [4,5] with application in the textile industry, leather tanning, paper production, food technology, agricultural research [6] light-harvesting arrays, photoelectrochemical cells and hair color production [8]. The textile trade accounts for two-thirds of the total dyestuff arcade, and during the dyeing process approximately 10% of the dyes used are discharged into the waste-water.…”

Adsorção Em Meio Aquoso Do Corante Azo Ponceau 4r Sobre Sílica Gel Organofuncionalizada Com Aptes

“…Os corantes do tipo azo constituem a classe de corante mais usada industrialmente, correspondendo a mais da metade dos corantes comercialmente utilizados (FAHMI ARIFFIN et al, 2010;FRANCISCON et al, 2012;NAM;RENGANATHAN;TRATNYEK, 2001;YIGITOGLU;TEMOCIN, 2010). Ressalte-se que estes compostos são de difícil remoção por tratamentos convencionais em efluentes industriais (e.g., lodo ativado, coagulação/floculação), a despeito de poderem se tornar tóxicos, carcinogênicos e mutagênicos no ambiente (GUPTA; SUHAS., KODAM;GAWAI, 2006;MAHMOODI et al, 2014;NAM;RENGANATHAN;TRATNYEK, 2001;PHAM;KOBAYASHI;ADACHI, 2015;YIGITOGLU;TEMOCIN, 2010).…”