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MBR 공정에서 수온에 따른 막오염 및 CEB 세정효율 특성 KCI 등재

Characterization of membrane fouling and CEB (Chemical enhanced backwashing) efficiency with temperature in SMBR Process

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상하수도학회지 (Journal of the Korean Society of Water and Wastewater)
대한상하수도학회 (Korean Society Of Water And Wastewater)
초록

In this paper, we investigate the characteristics of membrane fouling caused by water temperature in the Membrane bioreactor(MBR) process and try to derive the membrane fouling control by chemical enhanced backwashing(CEB). The extracellular polymeric substances(EPS) concentration was analyzed according to the water temperature in the MBR, and the membrane fouling characteristics were investigated according to the conditions, with sludge & without sludge, through a lab-scale reactor. As shown in the existing literature the fouling resistance rate was increased within sludge with the water temperature was lowered. However, in the lab-scale test using the synthetic wastewater, the fouling resistance increased with the water temperature. This is because that the protein of the EPS was more easily adsorbed on the membrane surface due to the increase of entropy due to the structural rearrangement of the protein inside the protein as the water temperature increases. In order to control membrane fouling, we tried to derive the cleaning characteristics of CEB by using sodium hypochlorite(NaOCl). We selected the condition with the chemicals and the retention time, and the higher the water temperature and the chemical concentration are the higher the efficiencies. It is considered that the increasing temperature accelerated the chemical reaction such as protein peptide binding and hydrolysis, so that the attached proteinaceous structure was dissolved and the frequency of the reaction collision with the protein with the chemical agent becomes higher. These results suggest that the MBRs operation focus on the fouling control of cake layer on membrane surface in low temperatures. On the other hand, the higher the water temperature is the more the operation strategies of fouling control by soluble EPS adsorption are needed.

저자
  • 박기태(성균관대학교 수자원전문대학원) | Kitae Park (Sungkyunkwan University Graduate School of Water Resources)
  • 박정훈(성균관대학교 수자원전문대학원) | Jeonghoon Park (Sungkyunkwan University Graduate School of Water Resources)
  • 최은혜(성균관대학교 수자원전문대학원) | ・Eunhye Choi (Sungkyunkwan University Graduate School of Water Resources)
  • ・김형수(성균관대학교 수자원전문대학원) | Hyungsoo Kim (Sungkyunkwan University Graduate School of Water Resources)
  • 김지훈(성균관대학교 수자원전문대학원) | Jihoon Kim (Sungkyunkwan University Graduate School of Water Resources) Corresponding author