Kutsarov, Radostin K.Chobanov, Ivan S.2024-05-282024-05-282015-02-261314-6246https://doi.uni-plovdiv.bg/handle/store/118The biobasins of the largest wastewater treatment plant (WWTP) on the Balkans has been examined. Samples were taken four times from the inlet and outlet flow. The concentration of the total hydrocarbons, benzene, toluene, ethylbenzene, p- xylene, m- xylene, o-xylene and styrene in the wastewater has been obtained by gas chromatography. The average experimental concentrations were used when the mass balance was made. The results indicate that about 60% of pollutants are emitted in the air, about 22% are assimilated through biodegradation, and nearly 18% leave WWTP with the purified water. The measured concentrations were also modeled by Water 9.3 program. Comparison between the measured amounts of pollution concentrations and those forecasted by the Water 9.3 program has been made.enbiobasinswastewater treatment plantmass balancemodelingArticle