본 연구는 혐기조, 안정화조, 무산소조, 막분리호기조로 구성된 membrane bioreactor의 운영을 통하여 도시 하수의 영양염류 제거 특성을 규명하였다. 수리학적 체류시간(HRT)과 슬러지 체류시간(SRT) 및 운영 여과 플럭스의 평균값은 각각 6.2시간, 34.1일과 19.6 L/$m^2$/hr (LMH)이었으며, 공정을 운전한 결과, $COD_{Cr}$, SS, TN 및 TP의 평균 제거율은 각각 94.3%, 99.9%, 69.4% 및 74.6%이었다. 슬러지 생산계수, SDNR, SNR, SPPR 및 SPUR은 각각 0.653 kgVSS/kgBOD/d, 0.044 $mgNO_3$-N/mgVSS/d, 0.035 $mgNH_4$-N/mgVSS/d, 51.0 mgP/gVSS/d 및 5.4 mgP/gVSS/d였다. 또한, 생산된 슬러지의 평균 질소 및 인 함량은 각각 8.86%와 3.5%였다.
This study was performed to investigate the characteristics of nutrient removal of municipal wastewater in membrane bioreactor system. Membrane bioreactor consists of four reactors such as the anaerobic, the stabilization, the anoxic and the submerged membrane aerobic reactor with two internal recycles. The hydraulic retention time (HRT), sludge retention time (SRT) and flux were 6.2 h, 34.1 days and 19.6 L/$m^2$/hr (LMH), respectively. The removal efficiency of $COD_{Cr}$, SS, TN and TP were 94.3%, 99.9%, 69.4%, and 74.6%, respectively. The estimated true biomass yield, specific denitrification rate (SDNR), specific nitrification rate (SNR), specific phosphorus release rate (SPRR) and specific phosphorus uptake rate (SPUR) were 0.653 kgVSS/kgBOD/d, 0.044 $mgNO_3$-N/mgVSS/d, 0.035 $mgNH_4$-N/mgVSS/d, 51.0 mgP/gVSS/d and 5.4 mgP/gVSS/d, respectively. The contents of nitrogen and phosphorus of biomass were 8.86% and 3.5% on an average.
