EN
The influence of didecyldimethylammonium chloride (DDDM) on the processes of denitrification - occurring with a contribution of Bacillus licheniformis bacteria, and desulfurication - with a contribution of Desulfotomaculum ruminis bacteria, was studied. It has been shown in laboratory conditions that the compound tested is not assimilable by the cultures of the above mentioned heterotrophic bacteria and the values of toxic concentrations of DDDM for the studied microorganisms were determined.