Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Synergistic effect of different organisms on the chromium bioremediation
Hamid Mukhtar, Ali Nawaz, ikram Haq

Last modified: 2015-11-27


Chromium is becoming one of the major concerns for the scientists and environmentalists globally. Present study describes the synergistic removal of chromium from waste water using bacteria, fungi and an aquatic plant. Chromium resistant fungi and bacteria were isolated from different soil samples. The fungal isolate Rhizopus sp. CRF2 removed 90% of the Cr from an initial concentration of 2mg/ml Cr present in the medium. 80% Cr removal from an initial concentration of 40µg/ml Cr was obtained by the bacterial isolate Bacillus sp. CRB9. Rhizopus sp. CRF2 removed maximum Cr present in the medium after 120 hrs of incubation while bacterial strain removed maximum amount of chromium present in the medium after 24 hrs. Optimum pH for heavy metal removal by both the isolates was 5.0 whereas the optimum temperatures of fungi and bacteria for Cr removal were 30oC and 37oC, respectively. When maize plant was grown in the Cr contaminated soil augmented with Rhizopus sp. CRF2 and Bacillus sp. CRB9, there was a considerable decrease in the chromium content of soil. In another experiment, Eichhornia crassipes (water hyacinth) and isolated microbes removed greater amounts of chromium synergistically from water as compared to that where Echornia crassipes was grown alone in the water contaminated with same amount of chromium. It can be concluded that bacteria, fungi and plants could be successfully applied together for chromium reduction in soil and water.