عنوان مقاله [English]
شماره 50- سال 1383 آب و فاضلاب
Petroleum refineries generate large amounts of wastewater with high concentrations of hazardous contaminants. The conventional treatment method is a biological treatment process preferably the activated sludge system. In this system some organic compounds can be toxic or inhibitory to some organisms above certain critical concentrations and cause the growth rates to decline, such as Toluene and Phenol. There are also accelerating materials to improve the biological treatment efficiencies, such as Methanol, Glucose etc. In the present work the effects of Phenol, Glycerine and Maltose on the performance of the process were investigated. The Phenol concentrations up to 100ppm did not show any inhibitory effects on the COD percent removal; however higher concentrations reduced the process treatment rate. Glycerine concentration., between 0-200 ppm caused increase in COD removal from 57% to 79%. Maltose gave similar results to Glycerine which has been fully discussed.