Identification of novel microbial isolate with efficiency of biodegradation of plastic and synthetic dyes

Synthetic dyes and plastic items disposed from textile industries are a major cause of environmental pollution and seriously affect societal life. Many bioremediation techniques have been employed for the management of these polluting agents. In this study, Bacillus sp. MZ540316, Bacillus sp. MZ540327, and Brevibacillus borstelensis MZ562352 were isolated as new microbial strains from soil samples nearby textile effluents with potential of degradation of plastic and synthetic dyes. Bacillus sp. MZ540316 showed lower degree of decolorization effect against orange M2R dyes, fast green, rose bengal, and yellow M4G synthetic dyes. Among these isolates, Bacillus sp. MZ540316 and Bacillus sp. MZ540327 showed effective biodegradation of low-density polyethylene (LDPE, up to 29.67%) and high-density polyethylene (HDPE) pellets (up to 24.26%). The weight of LDPE pellets was reduced from 2.47 to 29.67% with decrease in surface tension by 34.07 mN/m. The maximum loss of weight percentage of HDPE pellets was observed up to 24.26% with decrease in surface tension by 34.23 mN/m. Brevibacillus borstelensis MZ562352 had degraded polyethylene at a lower rate by 4.84% for LDPE and 3.28% of HDPE films during 70 days of incubation period. These isolates had also showed high degree of biodegradation against different types of azo dyes. Bacillus sp. MZ540327 showed high level of decolorization (80–85%) against rose bengal dye and fast green dyes. Brevibacillus borstelensis MZ562352 had showed effective biodegradation (>85%) against all these synthetic dyes.