Exploration of promising dye decolorizing bacterial strains obtained from Erode and Tiruppur textile wastes

The present research was carried out to explore potential dye decolorizing bacterial strains from the textile industry waste located in Erode and Tripur districts. Total heterophilic bacterial populations were confirmed and they were ranged from 2 x 10⁴ to 62 x 10⁶ CFU/gm. There was 96 morphologically distinct bacterial isolates were isolated from 12 different sludge, textile effluent and dye contaminated soil samples. Generic composition of the 96 isolates comprised of Bacillus sp., Enterobacteriaceae, Pseudomonas sp., Micrococcus sp., Alcaligenes sp., Aeromonas sp., Staphylococcus sp., and Lactobacillus sp. These bacterial strains were freshly screened by plate method on solid media containing Remazol golden yellow (RNL), Red (RGB) and Blue (RGB) for the detection of preliminary decolorization. Among 96 strains tested, 20 exhibited significant decolorization. Liquid culture method was adopted for secondary screening decolorization confirmed that 6 efficient strains decolorize the dye concentration within 24 hours under static condition. The strains utilized Remazol golden yellow dye as a carbon sources for their growth. RNL dye decolorization by 6 strains was attained and maximum of 84% decolorization was recorded at 48 hours in microaerophilic condition. Furthermore the mixed cultures of the potential strains were attributed to effectively decolorize the dye contaminated effluent along with RNL dye in the stimulated time period of 24–48 hours. These strains have the capability to withstand and tolerate the sodium chloride concentration up to 30g/l. This study clearly resulted selected potential dye decolorizing bacterial strains could be used for decolorization of textile effluent.