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KMID : 1024520160250111493
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Journal of the Environmental Sciences
2016 Volume.25 No. 11 p.1493 ~ p.1498
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GPS-X Based Modeling on the Process of Gang-byeon Sewage Treatment Plant and Design of Recycle Water Treatment Process
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Shin Choon-Hwan
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Abstract
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The efficiencies of Gang-Byeon sewage treatment facilities, which are based on GPS-X modelling, were analysed and used to design recycle water treatment processes. The effluent of an aeration tank contained total kjeldahl nitrogen (TKN) of 1.8mg/L with both C-1 and C-2 conditions, confirming that most ammonia nitrogen (NH3+-N) was converted to nitrate nitrogen(NO3--N). The concentrations of NH3+-N and NO3--N were found to be 222.5 and 227.2 mg/L, respectively, with C-1 conditions and 212.2 and 80.4 mg/L with C-2 conditions. Although C-2 conditions with higher organic matter yielded a
slightly higher nitrogen removal efficiency, sufficient denitrification was not observed to meet the discharge standards. For the total nitrogen (T-N) removal efficiency, the final effluent concentrations of T-N were 293.8 mg/L with biochemical oxygen demand (BOD) of 2,500 mg/L, being about 1.5 times lower than that (445.3 mg/L) with BOD of 2,000 mg/L. Therefore, an external carbon source to increase the C/N ratio was required to get sufficient denitrification. During the winter period with temperature less than 10 , the denitrification efficiency was dropped rapidly even with a high TKN concentration (1,500mg/L). This indicates that unit reactors (anoxic/aerobic tanks) for winter need to be installed to increase the hydraulic retention time. Thus, to enhance nitrification and denitrification efficiencies, flexible operations with seasons are recommended for nitrification/anoxic/denitrification tanks.
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KEYWORD
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GPS-X modelling, Recycle water, C/N ratio, Denitrification, T-N removal efficiency
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