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Nowadays, the industrialized world is confronted with the contamination of soils, water sources, and air with hazardous and toxic xenobiotics. Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants that have accumulated in the environment due to a variety of anthropogenic activities . In this study, an alkalotolerant bacterial consortium was developed by continuous enrichment in the chemostat in presence of dibenzofuran (DBF) as sole carbon source. Six different types of bacterial isolates were isolated on agar plates. Among the six isolates tested for degradation of DBF, strain C of alkalotolerant bacterial community had better potency to degrade dibenzofuran. Alkalotolerant bacterial consortia introduced in soil microcosm for evaluation of survival of most suitable isolates and degradation of dioxin-like compound indicated more than 90% degradation of dibenzofuran after 45 days by the bacterial consortia enriched for 180 days in the chemostat at pH 10, however, microbial community, not enriched in the chemostat, was not competent to utilize even 50% DBF after day 30. This suggests that the microbial community adapted for a longer time in chemostat had better efficiency for the degradation of DBF. Degradation of dibenzofuran in soil microcosm indicates that the community is competent enough to survive and retain its degrading potency even in-situ conditions.

Alkalotolerant consortium as a potential degrader of dioxin-like compounds of pulp and paper mill wastewater