International Journal of Environment (ISSN: 2186-0009)  

Decolorization of Methyl Red by Staphylococcus arlettae PF4 Isolated from Garden Soil
Pijush Sarkar, ANM Fakhruddin, Md. Kamruzzaman Pramanik and Abdullah-Al-Mahin
Azo dyes are toxicant to biological system and cause serious damage to environment. In the present study, an attempt was made to isolate methyl red, an azo dye, decolorizing bacteria from soil. Among six isolates with methyl red decolorizing ability, the potential bacterial isolates, PF4 was selected for identification and characterization. The organism was found to belong to the genus Staphylococcus and species arlettae. The isolate S. arlettae PF4 completely decolorized 600 and 800 mg/l methyl red within 24 and 48 h respectively. S. arlettae PF4 partially decolorized 1000 and 1200 mg/l methyl red within 72 h. The maximum decolorization rate (mg/l/h) for 600, 800, 1000 and 1200 mg/l methyl red concentrations were 25, 22.38, 17.08 and 16.29 mg/l/h respectively. Thus, due to high potential for methyl red decolorization the soil isolate S. arlettae PF4 can be used in the biological treatment plant of industrial effluent containing azo dyes.
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