In this paper we determined the organic loading values of influent and effluent wastewaters and estimated the pre-treatment efficiency. The microbial biomass concentration was determined by measuring optical density at 600 nm wavelength. It was shown that the studied wastewater is characterized as extremely concentrated one. COD value of the influent wastewater ranged from 8976 to 45264 mg/l, while the feed rate of COD pollution ranged from 65.7 to 1005 kg/h. The efficiency of the pretreatment process in the bioreactor ranged from 45 to 63 % during the analyzed period. The purification degree of the individual pollutants varied from 50 to 100 % on average and was 89.6 % during analyzed period. The optical density at 600 nm reached 0.45 units at the maximum efficiency of the pretreatment.
нефтехимические сточные воды, стирол, окись пропилена, оптическая плотность, биологическая предварительная обработка, petrochemical wastewaters, styrene, propylene oxide, optical density, biological pre-treatment
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