Isolation and Characterization of Cr (VI) Reducing Bacteria and Fungi Their Potential Use in Bioremediation of Chromium Containing Tannery Effluent (Ambur and Ranipet, Vellore dist, Tamilnadu)

Dr Ernest David

Abstract


The pollution of the environment with toxic heavy metals is spreading throughout the world along with industrial progress. Microorganisms and microbial products can be highly efficient bio-accumulators of soluble and particulate forms of metals especially dilute external solutions. Microbe related technologies may provide an alternative or addition to conventional method of metal removal or metal recovery. The present study deals with isolation and characterization of Chromium (VI) resistant fungi was isolated from Ambur and Ranipet tannery effluent collected in and around Vellore district, Tamilnadu, India. The influence of various factors such as pH, time interval and initial metal concentrations on the reduction of chromium by the bacterial isolates were studied. The fungal isolates tolerated Cr (VI) at 28 and 30ppm. At 28ppm  Aspergillus niger and Aspergillus flavus recorded maximum accumulation rates of 98.61% and 98.14% from Ambur Tannery effluent respectively. At 30 ppm Aspergillus niger and Aspergillus fumigattus removed 97.66% and 97.13% from Ranipet tannery effluent. Maximal Cr (VI) reduction was observed at pH4. The results indicate that the microbial consortia and the mono cultures of the above isolates can be useful for Cr (VI) detoxification of chromium contaminated environment.


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