The work deals with solving the problem of extraction of polycyclic hydrocarbons from waste water by using physical and chemical technology, including the use of flotation, settling, filtration, adsorption, ozonation. The use of such a technique makes it possible to significantly reduce the concentration of hazardous substances such as benzapirene in the waste water to be purified. Under certain modes of wastewater treatment using physical and chemical technology, the concentration of benzapirene does not exceed the regulatory values. Prospects for the use of biophlotocombines for the treatment of waste water containing complex organic substances are indicated.