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Industrial evolution has generated unprecedented disturbances in the environment due to the introduction of anthropogenic pollutants such as organic, inorganic and xenobiotic chemicals in the form of untreated industrial waste water. The tannery effluent wastes are ranked as high pollutants among all other industrial wastes. Tannery industrial wastewater is a serious consequence from the pollution point of view of streams, freshwater and land used for agriculture. The lack of awareness in the modern industrial practice has resulted in the discharge of tannery effluents which exhibit very high value for chromium, sulphide and Chloride. Chromium is known to be one of the most common inorganic contaminants of groundwater at pollutant hazardous sites. This investigation focuses on the ability of microorganisms isolated as Isolate 1 (Bacillus cereus F4810/72), Isolate 2, Isolate 3, Isolate 4 (Brevibacillus brevis US575) to reduce Chromium and degrade leather followed by enzymatic assays of the isolates. It also reveals that the ability to reduce Cr 6+ is maximum for Bacillus cereus F4810/72 compared to others. It was observed that Brevibacillus brevis US575 has the highest Lipase and Protease activity as well as the same has the maximum ability for leather degradation making it an effective strain for leather degradation. Our study reveals that all the four strains isolated from tannery effluents were found to produce keratinase out of which Bacillus cereus F4810/72 was able to produce highest 26U/ml keratinase. Over a wider range of pH (6-10) and temperature (37oC 45oC) it was found that pH 8 and 40°C was most suitable for keratinase production. So these isolates seemed to have potential for bioremediation of leather effluent pollution and thus, can serve as a potential tool to degrade leather waste.

A Study on the Bioremediation Ability of the Common Microflora Isolated From Tannery Effluents