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Effect of Sludge Recycle Ratio for Improvement of Sewage Treatment, in Ghaemshahr Textile Plant, a Bench Scale Model

Author(s): M. Sadeghpour | G. Najafpour | H.A. Rad | B. Hosseini

Journal: Iranica Journal of Energy and Environment (IJEE)
ISSN 2079-2115

Volume: 1;
Issue: 1;
Start page: 59;
Date: 2010;
Original page

Keywords: Activated sludge | Hydraulic retention times | Chemical oxygen demand | Return sludge ratio | Biological treatment

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 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.
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