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MODELING EFFICIENCY OF BIOLOGICAL PROCESS WITH AEROBIC GRANULAR SLUDGE
Abstract
Granular sludge aerobic technology (AGS) has been extensively studied in recent years because of its advantages compared to activated sludge technology. Currently, this technology is implemented in SBR (sequential batch bioreactor) configuration. An experimental model bioreactor was designed for adapting the AGS technology to continuous flow conditions. It consists of a rectangular shape bioreactor, an area for pre-settling and recycling of granules, followed by a settling tank. This configuration is more suitable for upgrading wastewater treatment plants using existing bioreactors. Various simulations were performed based on this experimental installation, using BioWin, a PC computer based process simulator designed for wastewater treatment process modeling. Efficiency of the process is determined in different cases: only aerobic environment, both aerobic and anaerobic environment and various nitrification rates, that is one of the main parameter in nitrification-denitrification process. Both organic matter and nitrogen removal efficiencies were studied. Results show a significant impact on the process of the nitrification rate and the growth rate of the microorganisms.
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