Textile Industry Wastewaters From Jetpur, Gujarat, India, Are Dominated by Shewanellaceae, Bacteroidaceae, and Pseudomonadaceae Harboring Genes Encoding Catalytic Enzymes for Textile Dye Degradation

Abstract

Textile industries play an important role in uplifting the national economies worldwide. Nevertheless, they generate a huge amount of intensive colored effluent, which is a serious threat to the environment. The microbial communities present in these highly polluted environmental sites help in remediating pollutants naturally. However, little is known about their genes and enzymes in the textile wastewater systems. In this study, we explored the microbial community structure and their functional capability in three different wastewater systems, i.e., industry sites, effluent treatment plant (ETP), and common effluent treatment plant (CETP). Our findings based on shotgun metagenomics highlight the varied bacterial diversity at the three industry sites. Overall, the major dominant phyla in the industry site and CETP samples were Proteobacteria and Bacteroidetes, while in the ETP site, Firmicutes, Cyanobacteria, and Proteobacteria were predominant. The final discharge sample site was having a higher proportion of the Proteobacteria and Bacteroidetes. Aeromonas caviae, Desulfovibrio desulfuricans, Klebsiella pneumoniae, Pseudomonas stutzeri, Shewanella decolorationis, Shewanella oneidensis, Shewanella putrefaciens, and Vibrio cholera were the abundant species across the three sites. Furthermore, this research study identified the key microbial genes encoding enzymes having a known role in textile dye and aromatic compound degradation. Functional annotation of the shotgun metagenome samples indicates the presence of reductase, azoreductase, nitrate/nitrite reductase, and oxidoreductase enzyme encoding genes. Our findings provide the shotgun metagenomics-based approach for mining the textile dye degrading genes and genomic insights into the bioremediation of textile industrial effluent.

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Bacterial–microalgal consortia for bioremediation of textile industry wastewater and resource recovery for circular economy

“…The textile industry plays a vital role in the global economy, contributing to sustainable development and the prosperity of nations. It encompasses the creation, manufacturing, and distribution of yarn, fabric, and clothing items [1]. Within various technological processes employed by the industry, dyes form a crucial component.…”

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“…It is one of the largest industrial sectors in terms of water consumption, with large amounts of water being used particularly during dyeing and printing processes. Waste water from textile industries contains a variety of persistent coloring pollutants, synthetic dyes, phenols, formaldehyde, phthalates, surfactants, chlorophenol, aromatic compounds and heavy metals [1][2][3]. Many of these pollutants are toxic and their removal by conventional methods such as adsorption, filtration, coagulation and chlorination is not effective [4].…”