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Estimation of Kinetic Coefficient and Assimilated Nutrients Mass in SBR Process  

Ji, Dae-Hyun (Department of Urban Engineering, Chungbuk National University)
Shin, Sang-Woo (Department of Urban Engineering, Chungbuk National University)
Lee, Kwang-Ho (Department of Urban Engineering, Chungbuk National University)
Lee, Jae-Kune (Daejeon Development Institute)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.5, 2007 , pp. 607-612 More about this Journal
Abstract
In this study, we investigated the variations of the kinetic coefficients and Chemical Oxygen Demand (COD), N and P mass used for assimilation of a sequencing batch reactor (SBR) system with the variation of SRTs; SRTs of 7.5, 10.0, 12.5, 15.0 and 20.0 days were tested in one cycle of SBR operation to determine the optimum conditions for the operation of the SBR and estimate its COD, nitrogen and phosphorus removal efficiencies. The SBR system was operated under the conditions as follows: an operation time of 6 hours per cycle, a hydraulic retention time (HRT) of 12 hours, an influent COD loading of $0.4kg/m^3/day$, and an influent nitrogen loading of $0.068kgT-N/m^3/day$. The yield coefficient (Y) and decay rate coefficient ($k_d$) were estimated to be 0.4198 kgMLVSS/kgCOD and $0.0107day^{-1}$ by calculating the removal rate of substrate according to the variation of SRT. Considering total nitrogen amount removed by sludge waste process, eliminated by denitrification, and in clarified water effluent with reference to 150 mg/cycle of influent nitrogen amount, the percentage of nitrogen mass balance from the ratio of the nitrogen amount in effluent (N output) to that in influent (N input) for Runs 1~5 were 95.5, 97.0, 95.5, 99.5, and 95.5%, respectively, which is well accounted for, with mass balances close to 100%.
Keywords
Decay rate coefficient; N mass balance; Sequencing batch reactor; Sludge retention time; True yield coefficient;
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