Enhanced biodegradation and detoxification of disperse azo dye Rubine GFL and textile industry effluent by defined fungal-bacterial consortium

Abstract Most currently employed textile effluent decolourization methods use physical and chemical processes where dyes do not get degraded instead concentrated or transferred into a solid phase. Therefore, further treatment processes are required to destroy dyes from the environment. In contrast, biological decolourization may result in degradation of the dye structure due to microbial activities and hence biological processes can be considered environmentally friendly. In the present study, bacterial strains with dye decolourization potential were isolated from the natural environment and their ability to decolourize four different reactive textile dyes was studied individually and in a bacterial consortium. The developed bacterial consortium composed with Proteus mirabilis, Morganella morganii and Enterobacter cloacae indicated more than 90% color removals for all four dyes and optimum decolourization of the dye mixture was observed at 40 °C and pH 7. The developed bacterial consortium decolourized 60% of dyes in textile industry effluent at 35 °C and pH 7 showing their ability to endure in highly complex and toxic environments and application in textile industry wastewaters.

Download Full-text

Enhanced azo dye biodegradation at high salinity by a halophilic bacterial consortium

Bioresource Technology ◽

10.1016/j.biortech.2021.124749 ◽

2021 ◽

Vol 326 ◽

pp. 124749

Author(s):

Fang Tian ◽

Yongbo Wang ◽

Guang Guo ◽

Keqiang Ding ◽

Feng Yang ◽

...

Keyword(s):

Azo Dye ◽

High Salinity ◽

Bacterial Consortium ◽

Azo Dye Biodegradation

Download Full-text

Adsorption of textile industry effluent in a fixed bed column using activated carbon prepared from agro-waste materials

Materials Today Proceedings ◽

10.1016/j.matpr.2020.12.029 ◽

2021 ◽

Author(s):

Niraj S. Topare ◽

Shantini A. Bokil

Keyword(s):

Activated Carbon ◽

Textile Industry ◽

Fixed Bed ◽

Waste Materials ◽

Fixed Bed Column ◽

Industry Effluent

Download Full-text

COD removal from textile industry effluent: pilot plant studies

Chemical Engineering Journal ◽

10.1016/s1385-8947(01)00197-8 ◽

2001 ◽

Vol 84 (2) ◽

pp. 125-131 ◽

Cited By ~ 26

Author(s):

G Walker

Keyword(s):

Pilot Plant ◽

Textile Industry ◽

Cod Removal ◽

Industry Effluent

Download Full-text

Biodegradation of selected azo dyes under methanogenic conditions

Water Science & Technology ◽

10.2166/wst.1997.0576 ◽

1997 ◽

Vol 36 (6-7) ◽

pp. 65-72 ◽

Cited By ~ 35

Author(s):

Elías Razo-Flores ◽

Maurice Luijten ◽

Brian Donlon ◽

Gatze Lettinga ◽

Jim Field

Keyword(s):

Azo Dyes ◽

Textile Industry ◽

Azo Dye ◽

Biological Treatment ◽

Present Report ◽

Anaerobic Bacteria ◽

Aminosalicylic Acid ◽

Batch Experiments ◽

Azo Reduction ◽

Uasb Reactors

Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria.

Download Full-text

Root Bacteria Recruited by Phragmites australis in Constructed Wetlands Have the Potential to Enhance Azo-Dye Phytodepuration

Microorganisms ◽

10.3390/microorganisms7100384 ◽

2019 ◽

Vol 7 (10) ◽

pp. 384 ◽

Cited By ~ 7

Author(s):

Valentina Riva ◽

Francesca Mapelli ◽

Evdokia Syranidou ◽

Elena Crotti ◽

Redouane Choukrallah ◽

...

Keyword(s):

Plant Growth ◽

Phragmites Australis ◽

Textile Industry ◽

Azo Dye ◽

Growth Promotion ◽

Wide Spectrum ◽

Reactive Black 5 ◽

Potential Use

The microbiome associated with plants used in phytodepuration systems can boost plant growth and services, especially in ecosystems dealing with recalcitrant compounds, hardly removed via traditional wastewater (WW) treatments, such as azo-dyes used in textile industry. In this context, we aimed to study the cultivable microbiome selected by Phragmites australis plants in a Constructed Wetland (CW) in Morocco, in order to obtain candidate inoculants for the phytodepuration of azo-dye contaminated WW. A collection of 152 rhizospheric and endophytic bacteria was established. The strains were phylogenetically identified and characterized for traits of interest in the phytodepuration context. All strains showed Plant Growth Promotion potential in vitro and 67% of them significantly improved the growth of a model plant in vivo compared to the non bacterized control plants. Moreover, most of the isolates were able to grow in presence of several model micropollutants typically found in WW, indicating their potential use in phytodepuration of a wide spectrum of effluents. The six most promising strains of the collection were tested in CW microcosms alone or as consortium: the consortium and two single inocula demonstrated to significantly increase the removal of the model azo-dye Reactive Black 5 compared to the non bacterized controls.

Download Full-text