Fig. 1.

Decolorization of dyes (reactive red-120, blue direct-1, reactive black-5, and congo red) by Bacillus sp. MR-1/2 after 24, 48 and 72 h. a At varying pH values, b at different temperatures, c: in the presence of varying levels of NaCl salt. Different lower case letters on the bars and lines represent significance between the dyes, pH levels, temperatures, and salt concentrations, respectively (Fisher’s LSD; P ≤ 0.05). Error bars represent the standard errors (n = 3)