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수온과 포기강도가 소규모 MBR공정의 막여과 효율에 미치는 영향
정훈섭 ( Hun-seob Jung ),현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2019 한국수처리학회지 Vol.27 No.3
The objective of this study is to investigate the influence of water temperature and aeration strength on membrane filtration of small-scale membrane bioreactor (MBR) with the treatment capacity of 100 m<sup>3</sup>/d, which consisted of anaerobic, anoxic, and aeration tank coupled with membrane. Experiments were conducted with real MBR system using real wastewater. Applied transmemrane pressure (TMP) was <0.5 kgf/cm<sup>2</sup>.h. Influent concentrations of real wastewater were in the range of BOD <100 mg/L, COD <70 mg/L, SS <105 mg/L, T-N <23 mg/L, T-P <3 mg/L, E-coli <110,000 no/mL, MLSS < 5,000 mg/L, respectively. As a result, the increase of both water temperature and aeration strength decreased TMP of MBR system. The efficiency of MBR system achieved the high removal for organic and particulate with removal efficiencies of >92%, while it achieved a relative low removal for nutrients with removal efficiencies of <53%.
MBR공정에 있어서 수리학적 거동이 막여과에 미치는 영향
이형옥 ( Hyeong-ok Lee ),정훈섭 ( Hun-seob Jung ),현길수 ( Kil-soo Hyun ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.5
Stirred dead-cell filtration has been widely used for fundamental studies on membrane fouling caused by soluble and colloidal matter during membrane filtration. In this study, the performance of MBR using a dead-end stirrer cell was conducted to investigate the removal of dissolved organic matters from real mixed liquor in aeration tank and transmembrane pressure (TMP) with hydraulic behavior on the membrane surface. Applied stirring rate as a hydraulic behavior index ranged from 100 to 1000 rpm. Influent water qualities were in the range of MLSS < 10,000 mg/L, UV<sub>254</sub> < 0.3 cm<sup>-1</sup>, dissolved organic carbon (DOC) < 45 mg/L, and specific UV absorbance (SUVA) <2.5 L/mg.m, respectively. As a result, the membrane biofiltration achieved higher efficiencies of TOC and DOC except UV<sub>254</sub> having lower efficiency < 40% regardless of the hydraulic shear force. An increase in the hydraulic shear force resulted in a decline in TMP. This indicates that higher hydraulic shear force is needed to improve TMP in operating a long-term filtration of MBR having a suitable permeate flux to enhance dissolved organic matter removal efficiency.