| Title |
A Study on the Rotating Biological Contactors for the Nitrification of Sewage |
| Authors |
정근진 ( Kun Jin Jung ) ; 이상수 ( Sang Soo Lee ) ; 김시현 ( Si Hyeon Kim ) ; 박규홍 ( Kyoo Hong Park ) |
| Abstract |
Nitrogen, in its various forms, can deplete dissolved oxygen levels in receiving waters, stimulate aquatic growth, exhibit toxicity toward aquatic life and affect the suitability of sewage for reuse. Pilot-scale Rotating Biological Contactor(RBC) experiments were conducted to examine biological nitrification, respectively, of municipal sewage with five different internal recirculation ratios of 0, 1, 2, 3, and 4 using the constant hydraulic loading of 205 U/㎡·day. The use of internal recirculation improved nitrification on account of the dilution of biodegradable organic carbon in influent sewage down to 15mg/L of SBOD_5 or less. Ammonium nitrogen of 14.3±2.4 % was consumed by cellular assimilation without the occurrence of denitrification. The thickness of biofilm didn`t seem effect significantly the nitrification and denitrification. Nitrification with internal recirculation was found to occur using hydraulic loading rate of as high as 205L/㎡·day, which was beyond the generally known values of it. |