Influence of selective substrate on polychlorobiphenyl-degradative activity of aerobic soil bacterial associations

As a result of enrichment cultivation using ortho-phthalate, naphthalene or biphenyl as a selective factor, six aerobic bacterial associations were obtained. It was found that all associations, having reached a stable composition, actively grow on a selective substrate. However, associations, isolated using ortho-phthalate as a selective factor, do not have the ability to use biphenyl as a carbon source. Associations R24, R63, R26 and R62 grow effectively in a mineral medoum with biphenyl, and also decompose commercial PCB mixtures by the classical pathway of biphenyl oxidation. The level of destruction of Trihlo-robiphenyl by these associations was 99.7 - 99.8%, and for Sovol - 99.6 - 99.8% in 8 days. At the same time, there was no significant difference in biodegradation indices between the R24 and R63 associations selected on biphenyl and the R26 and R62 associations isolated on naphthalene.