Decolourisation of Textile Dyes and Biological Stains by Bacterial Strains Isolated From Industrial Effluents

Abstract

The color removal of textile wastewater is a major environmental concern. Color can be removed from wastewater by Physico-chemical methods such as adsorption, irradiation, ion exchange, oxidative process, ozonation, coagulation have been used to decolorize textile effluents,but these methods are costly, inefficient and sometimes produce hazardous by-product, it also affects the environment during the degradation process. The effluents discharged by different industries contain a high range of physico-chemical parameters like conductivity, hardness, alkalinity, COD, TSS, nitrates, nitrites, cations and anions. The effluent which is untreated is one of the major sources of consumed metal dyes, phenol, aromatic amines. Several aromatic amines are known mutagens and carcinogens to human beings. Among low cost, viable alternatives, available for effluent treatment and decolourization, the biological systems are recognized.The present study was undertaken to explore with the Textile dyes effluents&Biological stains degraded by the bacterial strains isolated from the effluent sample.Phytotoxicity of the textile dyes was estimated by measuring the relative changes in seed germination of plants. Radicle and Plumule growth (length) were recorded after 6 days of exposure to different concentrations of dyes. Toxicity of dye was reduced after decolourization. This property of these bacterial isolates shows a potential that can be utilized for the bioremediation of various textile industrial effluents thus saving the ecosystem from harmful effects of various dyes.