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Defining optimum configuration for secondary clarifier using computer simulation  

Lee, Byong-Hi (경기대학교 공과대학 환경에너지시스템공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.24, no.2, 2010 , pp. 219-230 More about this Journal
Abstract
Computer simulation has been widely used to design and optimize the operation of wastewater treatment plants since 1980. For secondary clarifiers, the simulation has been a tool to optimize the performance by providing dimensions for flocculation well. However, there has been no attempt to find the optimized geometrical parameters in circular secondary clarifier using simulation tools. In this study, three SVIs (Sludge Volume Indexes), two well types (feed and flocculation wells), 8 SWDs (Side Water Depths) and 9 bottom slopes were variables for simulation. Diurnal inflow and associated MLSS (Mixed Liquor Suspended Solid) concentrations were used for input loadings. When flocculation well was installed, 48% less concentration at lowest ESS (Effluent Suspended Solid) concentrations was produced and the diurnal ESS concentration range had been reduced by 52%. From these results, flocculation well must be installed to produce lower and stable ESS from circular secondary clarifiers. Under same loading conditions with $300m{\ell}$/g of SVI, The lowest ESS was produced when SWD was 4.5m with 4% of bottom slope. Therefore, SWD and bottom slope must not be deeper than 4.5m and must be near 4%, respectively, in circular clarifier with flocculation well to produce the lowest ESS concentration.
Keywords
circular secondary clarifier; simulation; feed well; flocculation well; Side Water Depth(SWD); Bottom Slope;
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Times Cited By KSCI : 1  (Citation Analysis)
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