Accepted 2nd March, 2019
Wastewaters containing chromium are produced from different industries. In food chains it causes dangerous health weakness, carcinogenicity and mutagenesis in different living systems. Thousands Tons of industrial waste water containing chromium are discarded every year. Chromium biomass can be used as a cheap source for chromium. So, In this work five different bacterial species, namely Bacillus Megaterium EMCC 1013, Rhizobium Rhizogenes EMCC1743, Rhizobium Leguminosarum EMCC1130, Azotobacter Vinelandii and Nocardiopsis Dassenvillei were evaluated potential for its activity in bioremediation of chromium. The results show that the five bacterial species have different capacities for chromium removal. Two stage of chromium adsorption. Azotobacter vinelandii has the highest capacity for bioremediation of chromium amounting 10ml (39.5 ppm) with 93.52 % removal during two steps under the optimization condition of 24 h with inoculum size 0.1 x 1029 cfu at PH 7 and energy source is glucose and ammonium oxalate as carbon and nitrogen source respectively at 30 °C incubation temprature. The main purpose of this study is to improve the bioremediation of chromium from wastewater during two steps to maximize the percentage of chromium removal. Screening the bioremediation capacity of chromium as heavy metal by different bacterial species encourage using them in future study for removal of chromium from electroplating waste water. In addition, Azotobacter vinelandii as the most effective chromium resistant microorganism will be very useful in biotechnology for the remediation of Cr contaminated environments and can also be used in the construction of biomarkers for the detection of chromium.
Keywords: Environmental pollutants, Azotobacter Vinelandii , Wastewater, Biotechnology