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This research was aimed at modification of Bacillus and Psuedomonas species isolated from dye contaminated soil with physical and chemical mutagens for improved dye biodecolourization. Textile effluent and dye contaminated soil were collected from a textile industry located at Challawa industrial area Kano, Nigeria. Bacillus cereus, Bacillus firmus, Pseudomonas aeruginosa and Pseudomonas flourescens were isolated and selected based on their biodegradation potentials of textile effluents. The Bacillus and Pseudomonas species were modified with Ultra-violet rays at 254nm and Nitrous acid at different time interval (5, 10, 15, 20, 25 and 30mins). Ultra-Violet (UV) light irradiated strains showed percentage survival that ranged from 3.04% Bacillus cereus (B8UV30) to 56.15% Pseudomonas fluorescens (P23UV5). The effect of nitrous acid (NHO22.0M) treatment on survival after exposure by the parent strains (B6WS, B8WS, P2WS and P23WS) at different time interval (10,15,20,25,30mins) showed percentage survival ranging from 10.37% Pseudomonas fluorescens (P23NA10) to 58.76% Bacillus cereus (B8NA10). The modified strains (B8UV30) had higher textile effluent decolourization potentials of 60.30±0.04 than the parent strain (B8WS) which showed 42.56±0.13% biodecolourization activities. Thus, the modified strains could be employed in the biodecolourization of textile effluents to meet acceptable levels prior to discharge of textile effluents into the receiving environment.

Biodecolourization of Textile Effluent using Mutagenised Strains of Pseudomonas and Bacillus species Isolated from Dyed Contaminated Soil.