Bioremediation of industrial effluent containing reactive dyes

With the rapid industrialization water pollution has become a major problem. Characteristics of industrial effluent depend upon the type of industrial raw material and the output of product. In the present study, 1000 m³/day effluent from a Textile Industry was successfully treated with the consortia of Microorganisms capable of degrading reactive dyes. The BOD and COD were reduced by 96.37% and 98.16% respectively with the retention time of 72 hrs. The aeration system consisted of diffused air. The MLSS was maintained at 6000 to 8000 ppm. The raw effluent had BOD in the range of 1700 to 1860 ppm while COD was 4500 to 5600 ppm and TDS in the range of 8000 to 10, 000 ppm. The extended aeration system gave better results than conventional system. The treated effluent was given one hour ozone treatment to further reduce BOD and COD. The biological treatment reduced the cost of chemical by almost 53% while sludge generation was reduced by 62%. Thereby making it highly economical. The treated effluent had no color, BOD less than 30 ppm and COD less than 200 ppm.