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e-Journal of Science & Technology
2015

REMOVAL OF CHROMIUM FROM WASTE WATER WITH THE HELP OF MICROBES: A REVIEW

Asha Lata Singh

Environmental Science, Department of Botany, Banaras Hindu University, Varanasi.

Abstract

Chromium VI (CrVI) is one of the highly toxi c heavy metals. It is widely used in a number of industries like me tallurgical, electroplating, paints, pigments, inks, fungicides and photography. It enters into the natural water bodies through the industrial effluents creating water pollution. In trace amounts it is useful for some of the metabolic activities like glucose, lipi d, aminoacids and nucleic acid. However at higher concentration it becomes toxic fo r microbes, plants and humanbeings and causes a number of serious diseases. Th erefore its removal from waste water is considered to be very important. In the pr esent article chromium removal from waste water using bacteria by bios orption, reduction and transpor t was reviewed. Published literature suggests that immobilized, fr ee and living cells, their extracellular metabolites even dead bacterial biomass play an important role in chromium removal from waste water. Reduction of Cr (VI) is one of the important mechanisms for its detoxification from waste wa ter.It was shown by the wo rk published so far that chromium reduction was carried out by aerobi c and anaerobic bact eria and iron and sulphate reducing bacteria. pH inside the bact erial cells plays an important role in the reduction of Cr (VI). Review of literature suggests that different factors like pH, temperature, redox potential and presence of other metals play an important role in the removal of Cr (VI) from waste water using ba cteria. We have carried out work in our laboratory on Cr (VI) uptake from waste water by Bacillus mycoides and the results obtained are also discusse d in this communication.

Keywords: Chromium; biosorption; reducti on; uptake; regulating factors.


 
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