| Title |
Comparison of Biological Nutrient Removal Efficiencies on the Different Types of Membrane |
| Authors |
박종부 ( Jong Bu Park ) ; 신경숙 ( Kyung Sook Shin ) ; 허형우 ( Hyung Woo Hur ) ; 강호 ( Ho Kang ) |
| Keywords |
Flat sheet; Hollow fiber; Membrane bioreactor; SDNR; SNR |
| Abstract |
This study was performed to investigate the characteristics of nutrient removal of municipal wastewater in the membrane bioreactor system with the different types of membrane. Membrane bioreactor consists of three reactors such as two intermittent anaerobic and the submerged membrane aerobic reactor with flat sheet and hollow fiber membrane, respectively. The removal efficiencies of COD(Cr), BOD, SS, TN and TP on the flat sheet membrane bioreactor were 94.3%, 99.0%, 99.9%, 70.3% and 63.1%, respectively. In addition, The removal efficiencies of COD(Cr), BOD, SS, TN and TP on the hollow fiber membrane bioreactor were 94.0%, 99.3%, 99.9%, 69.9% and 66.9%, respectively. The estimated true biomass yield, specific denitrification rate (SDNR), specific nitrification rate (SNR) and phosphorus removal content on the flat sheet membrane bioreactor were 0.33 kgVSS/kgBOD·d, 0.043 mgNO3-N/mgVSS·d, 0.031 mgNH4-N/mgVSS·d, and 0.144 kgP/d, respectively. In addition, the estimated true biomass yield, specific denitrification rate (SDNR), specific nitrification rate (SNR) and phosphorus removal content on the hollow fiber membrane bioreactor were 0.30 kgVSS/kgBOD·d, 0.067 mgNO3-N/mgVSS·d, 0.028 mgNH4-N/mgVSS·d, and 0.121 kgP/d, respectively. There was little difference between the flat sheet and hollow fiber on the nutrient removal efficiencies except SNR and SDNR. These differences between them were caused by the air demand to prevent the membrane fouling. The flux and oxygen demand for air scouring were 19.0 L/m2/hr and 2.28 m3/min for the flat sheet membrane, and 20.7 L/m2/hr and 1.77 m3/min for the hollow fiber membrane on an average. |