Журнал биоремедиации и биодеградации

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Treatment of Dye Industry Effluent Using Free and Immobilized Cyanobacteria

Subramaniyan Vijayakumar and Chockaiya Manoharan

In the present study, dye industry effluent was treated with Cyanobacteria for removing colour and other nutrients. Oscillatoria brevis and Westiellopsis prolifica were selected for the study based on their dominant occurrence in the effluent. Organisms were used in both free and immobilized conditions. These organisms not only removed the organic and in organic chemicals but also reduced the intensity of the colour from the effluent. The result revealed that within 30 days, more than 75% of colour has been removed. Nutrients such as nitrites, phosphates and ammonia were completely removed. Increase in Dissolved Oxygen (DO) content and reduction of Biological Oxygen demand (BOD), Chemical Oxygen demand (COD) up to 95% have been reported. Among the two conditions, immobilized cyanobacteria were more effective than that of free cells. Generally the effluent supported the growth of Oscillatoria and Westiellopsis, but the growth was not well pronounced as compared to control. It is concluded that Oscillatoria had a little edge over than Westiellopsis, can successfully be used not only to reduce pollution load but also for colour
removal purposes.