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Simulations of a System Dynamics Model for Operations and Maintenance of Activated-Sludge Wastewater Treatment Plants  

Park, Suwan (Department of Civil Engineering, Pusan National University)
Kim, Bong Jae (Korean Water Resources Corporation)
Jun, Hwan Don (Department of Civil and Environmental Engineering, Korea University)
Kim, In Chul (Division of Architecture and Civil Engineering, Dongseo University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.5, 2006 , pp. 905-912 More about this Journal
Abstract
In this paper, simulation methods of the system dynamics model developed by Das et al. (1997) for activated-sludge wastewater treatment plants are illustrated in an attempt to determine the operating rules and the policies related to capacity expansion of an activated-sludge wastewater treatment plant. For existing conditions, the analyses were performed by varying activated-sludge return rate to observe changes in effluent water quality and treatment efficiency. The effluent water quality is also analyzed for various average daily inflow conditions and activated-sludge return rates. As a result, without expanding the aeration tank, maximum average daily inflow that can satisfy the effluent water quality standard of BOD $0.02kg/m^3$ was determined as $2,840m^3/hr$, subject to 100% of activated-sludge return rate while other factors remain constant. When the activated-sludge return rate is less than 100%, expansion of the aeration tank is necessary and minimum sizes of the aeration tank to satisfy the effluent water quality standard were determined for various activated-sludge return rates. In addition, the total operating and maintenance as well as unit treatment cost regression equations for activated-sludge wastewater treatment plants are suggested by using the cost data that are obtained from Water and Wastewater Division, Ministry of Environment. The regression analyses showed that the economies of scale phenomena exist in the operating and maintenance costs of activated-sludge wastewater treatment plants.
Keywords
Activated-sludge wastewater treatment plant; Capacity expansion; Operating and maintenance costs; Simulation; System dynamics;
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