SWPP Media를 이용한 BNR 공정의 동력학 인자 및 유출수의 수질예측

초록

This study was performed to estimate effluent concentration and kinetic parameters in biological nutrient removal(BNR) process using SWPP media. These systems were operated with HRT of 5hrs through 14hrs at internal recycle of 50%. The removal efficiencies of BOD, at four HRT of 5, 8, 10, 14 hrs, were 82.4, 89.9, 92.9 and 94.8%, respectively. The overall nitrogen removal efficiencies were 39.1%～82.8% for T-N and 44.8%～95.4% for NH4+-N. And it was found that high removal efficiency of nitrogen was obtained by long HRT. Phosphorous removal efficiencies were very low during overall operation. Therefore, further study is needed to enhance the phosphorous removal efficiency in this process. The Stover-Kincannon model was adapted to the aerobic tank. The kinetic equations, removal of NH4+-N and COD, were similar to monod equation. The specific maximal NH4+-N removal efficiency(M) and proportionality constant(k) were 4.95 g NH4+-N/m2/day and 3.14 g NH4+-N/m2/day, respectively. And for the organic matters, M and K were 17.0 g COD/m2/day and 18.0 g COD/m2/day and it was found that the experimental and the estimated values corresponded well. In anaerobic tank, M and k were 186.4 g COD/m2/day, 285.0 g COD/m2/day, respectively. However, as the organic loading rate increased, the removal rate decreased. Thus, it was found that the adaption of the stover-Kincannon model was inadequate, because experimental and estimated value did not correspond.

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