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정창화,심유섭,김성준,박철휘 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6
The purpose of this study was to develop a solution to reduce the cost of methanol as external carbon source. The raw water of J-S.T.P. contains low concentration of readily biodegradable organics and high concentration of nitrogen due to the influents of industrial wastewater and leachate. Consequently, the influent C/N ratio is very low, and thus the supplemental addition of methanol is required to provide external carbon source for denitrification. Pilot plant experiments composed 2-stage denitrification process were performed to examine the effects and performances of the selected carbon source and the operation conditions for applications in practice. When the same amount of denitrifying substrates based on denitrification rate of methanol were injected, the effluent T-N concentration of using mecellulose wastewater was similar to that of methanol. Comparing the influent concentration of carbon source and the denitrification rate, it was shown that the denitrifying potential of mecellulose wastewater was 60% and injecting 1/3 of carbon source into the preanoxic tank was appropriate to ensure the stabilized effluent water quality. The COD,, requirement of mecellulose wastewater per nitrogen removed was 1.4 times of the required amount for methanol, and the settlability of sludge treated with mecellulose wastewater improved about 29%, which confirmed its potential as effective external carbon source.
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GPS-X 시뮬레이션을 이용한 2단탈질 공정에서 외부탄소원 적용성 평가
정창화,심유섭,김태형,박철휘 대한상하수도학회 2004 상하수도학회지 Vol.18 No.1
The purpose of this study was to evaluate adaptability of external carbon source using GPS-X program in pilot plant composed with 2-stage denitrification process. The result from analysis of pilot plant operation and GPS-X simulation showed that effluent concentration could be simulated similarly by modifying operation conditions, such as DO concentration, C/N ratio and other calibrated parameter. In order to satisfy the standard of the effluent water quality on T-N of 20㎎/L, it required approximately 3.1 of C/N ratio and 50% of nitrogen removal efficiency when influent T-N is 36.9㎎/L. To maintain the stable water quality of the receiving water, the effluent T-N concentration should be less than 10-15㎎/L and the appropriate C/N ratio to remove nitrogen was 4.27-6.82. The analysis of sensitivity to kinetic coefficient and reaction constant showed that Y_(H) and μ_(mAUT) were most sensitive to nitrate and ammonia nitrogen, relatively and sensitivity coefficient of their were 1.32, 1.98. It was concluded that as Y_(H) decreased and μ_(mAUT) increased, the reaction rates of denitrification and nitrification increased and the removal efficiencies of NO₃^(-)-N and NH₄^(+)-N improved.
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