期刊名称：Iranica Journal of Energy and Environment (IJEE)
印刷版ISSN：2079-2115
电子版ISSN：2079-2123
出版年度：2010
期号：3130
页码：59-64
出版社：Noshirvani University of TEchnology
摘要：The purpose of present study was to demonstrate the effect of return sludge ratio which was influenced the treatability of municipal wastewater. The fresh wastewater with identified composition was collected from the influent of a domestic plant, Ghemshar, Iran. To demonstrate the use of activated sludge process in domestic wastewater treatment plant, a bench- scale aerobic digestion tank was used for bench-scale experimental model. A cubical aeration tank and sedimentation tank was fabricated from plexi-glass. Fresh wastewater was introduced into the aerated tank and then the effluent was settled in a settling basin. Some proportional of the aged sludge was recycled to the aeration tank in order to enhance the wastewater treatment. In this experiment, results showed that 8 h hydraulic retention times (HRT) was the suitable operational parameters. In this system, pH range, DO and temperature were 7.5 to 8.5, 4-6 mg/l and 22-25 Deg C, respectively. COD removal was directly related to sludge recycle ratio. By increasing return sludge from 2.5 to 40 percent, the COD removal was increased from 70 to 95 percent. Kinetic parameters and kinetic model for COD removal of biological activated sludge system were determined.
