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http://dx.doi.org/10.33768/ksue.2018.18.4.401

Evaluation of Operational Options of Wastewater Treatment Using EQPS Models  

Yoo, Hosik (Department of Environmental and Energy Eng., Kyonggi University)
Ahn, Seyoung (Water Engineering & Consulting, Inc.)
Publication Information
Journal of the Korean Society of Urban Environment / v.18, no.4, 2018 , pp. 401-408 More about this Journal
Abstract
EQPS (Effluent Quality Prediction System, Dynamita, France) was applied to analyze the appropriateness of the design of a bioreactor in A sewage treatment plant. A sewage treatment plant was designed by setting the design concentration of the secondary clarifier effluent to total nitrogen and total phosphorus, 10 mg/L and 1.8 mg/L, respectively, in order to comply with the target water quality at the level of the hydrophilic water. The retention time of the 4-stage BNR reactor was 9.6 hours, which was 0.5 for the pre-anoxic tank, 1.0 for the anaerobic tank, 2.9 for the anoxic tank, and 5.2 hours for the aerobic tank. As a result of the modeling of the winter season, the retention time of the anaerobic tank was increased by 0.2 hours in order to satisfy the target water quality of the hydrophilic water level. The default coefficients of the one step nitrification denitrification model proposed by the software manufacturer were used to exclude distortion of the modeling results. Since the process modeling generally presents optimal conditions, the retention time of the 4-stage BNR should be increased to 9.8 hours considering the bioreactor margin. The accurate use of process modeling in the design stage of the sewage treatment plant is a way to ensure the stability of the treatment performance and efficiency after construction of the sewage treatment plant.
Keywords
Process modeling; simulation; retention time; external carbon source; default coefficient;
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