| Title |
Rotating Biological Contactors with Internal Recirculation using High Hydraulic Loading for the Removal of Nitrogen of Domestic Sewage |
| Authors |
정근진 ( Jeong Geun Jin ) ; 박규홍 ( Park Gyu Hong ) |
| Keywords |
rotating biological contactor; RBC; recirculation ratios; nitrification; denitrification; 회전원판법; 탈질화; 질산화; 반송비; 질소제거 |
| Abstract |
The experiments of the combined RBC system for denitrification and nitrification were performed using various hydraulic loading rates varied with the internal recirculation ratios. On the combined RBC system, hydraulic loading rates examined in the denitrification reactor were 509, 764, 1,019, and 1,273 ℓ/㎥·day with corresponding hydraulic retention time(HRT) of 61, 40, 30, and 24 minutes, while in the nitrification reactors hydraulic loading rates were 127, 191, 255, and 318 ℓ/㎥· day with corresponding hydraulic retention time of 91, 61, 46, and 37 minutes. The double substrate kinetic model suggested by Dixon and Brown(l977) was fitted to the denitrification data observed in the combined denitrificationhitrification system, showing the correlation coefficient of 0.90. Therefore, it was found that denitrification in the submerged RBC reactor was reasonably well simulated by Dixon and Brown`s model and was significantly controlled by SBOD_(5) and nitrate load. The use of internal recirculation improved nitrification on account of the dilution of biodegradable organic carbon in influent sewage down to 15 ㎎/L of SBOD_(5) or less. |