Ecological Systems and Devices Annotation << Back Investigation of the Effectiveness of Purification of Phenolic Wastewater by Ozonation in the Presence of Activated Carbon Mazitova A.K., Sukhareva I.A., Chuykin A.E., Aminova A.F., Safarov A.Kh., Zakarin E.I. The oxidative effect of ozone in the presence of activated carbon in the process of wastewater treatment containing phenols and sulfates has been studied. The effect of the dose of ozone and coal, pH, and temperature of wastewater on the residual concentration of phenol and the value of COD during oxidative purification was tested. The toxicity index of treated wastewater was 0.32, which corresponds to the fi fth class of «Practically non-hazardous substances». The use of activated carbon in the ozonation of the wastewater under study makes it possible to abandon the physico-chemical purification stage (coagulation + flocculation), which is environmentally appropriate. Keywords: activated carbon; chemical oxygen demand; ozone; phenolic wastewater. DOI: 10.25791/esip.5.2025.1519 Pp. 11-17.