eng Science and Education Publishing American Journal of Environmental Protection 2013-03-03 1 1 14 16 10.12691/env-1-1-3 ENV2013113 article T. Raghuraman 1 C. Jerome Geoffrey S. Suriyanarayanan A. J. Thatheyus jthatheyus@yahoo.co.in 2 Department of Immunology and Microbiology, The American College, Madurai, India PG and Research Department of Zoology, The American College, Madurai, India Tannery effluent is a major source of aquatic pollution in India. Hexavalent chromium compounds are being used in a wide variety of commercial processes and unregulated disposal of the chromium containing effluent has led to the contamination of soil, sediment, surface and ground waters. In trace amounts, chromium is considered an essential nutrient for numerous organisms, but at higher level, it is toxic and mutagenic. Therefore in the present study three strains of Pseudomonas such as Pseudomonas aeruginosa, P.florescens strain 1 and 2 were isolated from the collected tannery effluent samples. All the three strains showed more than 60 percentage of reduction for all chromium concentrations (500, 1000, 1500 and 2000ppm) tested. http://pubs.sciepub.com/env/1/1/3/env-1-1-3.pdf chromium tannery effluent pseudomonas