Review article

The article discusses the issues of biological treatment technology of chemical production industrial wastewater with a high content of toxic substances, such as formaldehyde, methanol, organic solvents, surfactants, dyes, urea. The technological sequence of processing involves the organic pollutants` destruction by immobilized sectioned associations of hydrobionts, mainly, representatives of the Pseudomonas, Arthrobacter, Bacillus genera and their associations capable of using elements of variable valence for oxidation, in particular, nitrogen and sulfur compounds as terminal electron acceptors. A high concentration of biomass of hydrobionts in bioreactors was created and maintained by means of immobilizing hydrobionts on carriers. The quality of treatment of sewage discharged into the city collector and processed at treatment plants has shown stable values for 8 months with indicators, mg/dm3: COD - 480-520 (efficiency - 95 %), formaldehyde - up to 1 (efficiency - 99.8 %), methanol - up to 1 (efficiency - 99.7 %).