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세라믹 분리막의 분산형 용수공급 시스템 적용을 위한 전처리 연계공정의 고플럭스 평가
강준석,박서경,이정은,강소연,이정준,쿠엔 보(Vo Thi Kim Quyen),김성수,김한승 한국수처리학회 2018 한국수처리학회지 Vol.26 No.6
In this study, applicability of the decentralized water supply system were investigated by the high flux evaluation using ceramic membrane with combined pretreatment process. A) filtration process increased the transmembrane pressure of 1.4 kPa and 89.5 kPa on 2 and 5 m3/m2․d of filtration flux, respectively, the physical backwashing recovery rate were less than 28.6%. The (B) Coag./Floc. - Sedi. combined process with 4 mg / L of A-PAC showed that the transmembrane pressure increased to within 6 kPa, the physical backwashing recovery rate was over 37.9 % higher than (A) Filtration process. (C) Coag./Floc. combined process showed an increase of transmembrane pressure compared with (B) Coag./Floc. - Sedi. combined process, physical backwashing recovery rate was over 84%. As a result of the membrane fouling analysis using the resistance in series model, the combined pretreatment process showed that the cake resistance (Rc) was more than 92% at membrane filtration flux of 2 m3/m2․d. In the (C) Coag./Floc. combined process, cake resistance(Rc) was over 86% on high flux conditions. The coagulation floc contained in influent was removed by the membrane, and the cake layer formed with the removed floc was identified as reversible fouling resistance which could be recovered by physical backwashing. The decentralized water supply system, which has the limitation of site area and installation space, is considered to could be operation of high flux of ceramic membrane by applying (C) Coag./Floc. combined process without sedimentation process.
막여과 정수처리공정에서 망간에 의한 막오염 특성 및 화학세정효율 평가
강준석,박서경,송지영,정아영,이정준,김한승 대한상하수도학회 2017 상하수도학회지 Vol.31 No.6
In water treatment process using microfiltration membranes, manganese is a substance that causes inorganic membrane fouling. As a result of analysis on the operation data taken from I WTP(Water Treatment Plant), it was confirmed that the increase of TMP was very severe during the period of manganese inflow. The membrane fouling fastened the increase of TMP and shortened the service time of filtration or the cleaning cycle. The TMP of the membrane increased to the maximum of 2.13 kgf/cm2, but it was recovered to the initial level (0.17 kgf/cm2) by the 1st acid cleaning step. It was obvious that the main membrane fouling contaminants are due to inorganic substances. As a result of the analysis on the chemical waste, the concentrations of aluminum(146-164 mg/L) and manganese(110-126 mg/L) were very high. It is considered that aluminum was due to the residual unreacted during coagulation step as a pretreatment process. And manganese is thought to be due to the adsorption on the membrane surface as an adsorbate in feed water component during filtration step. For the efficient maintenance of the membrane filtration facilities, optimization of chemical concentration and CIP conditions is very important when finding the abnormal level of influent including foulants such as manganese.
세라믹 분리막을 이용한 해수담수화 전처리 공정에서 조류 유입에 대한 유지세정 적용
강준석,박서경,이정준,김한승 대한상하수도학회 2018 상하수도학회지 Vol.32 No.2
In this study, the effect of chemically enhanced backwash(CEB) coping with algal(Heterosigma Akashiwo) inflow was evaluated in the seawater desalination pretreatment process using ceramic membrane. In order to confirm the possibility of long-term filtration operation, the recovery rate of transmembrane pressure(TMP) due to the CEB using NaOCl was examined. When the membrane flow rate was 83.3 LMH, the TMP was maintained within 200 kPa for 84 hours in seawater influent. As the algal counts of 30,000 cell/mL were injected into the influent of seawater, however, the TMP rapidly increased and exceed maximum value. Membrane fouling caused by the algae was very poorly recovered by usual physical backwash. CEB was performed for 30 min(3 min circulation / 27 min immersion) with 300 mg/L of NaOCl. As a result of the CEB application, it was possible to maintain a stable operating of filtration during 10 days and the average recovery rate of TMP by the CEB was 98.1%. It has been confirmed that the CEB using NaOCl is very effective in removal of membrane fouling by algae, resulted in stable membrane filtration for the long-term operation.
분산형 용수공급 시스템에서 고유속 세라믹 분리막 공정의 적용을 위한 막오염 해석 연구
강준석,이정은,강소연,안선아,쿠엔 보(Vo Thi Kim Quyen),김성수,김한승 한국수처리학회 2019 한국수처리학회지 Vol.27 No.5
In this study, applicability of the decentralized water supply system were investigated by the high flux evaluation using ceramic membrane. In the constant pressure filtration process, the resistance in series model was applied to confirm the membrane fouling mechanism according to the water qualities and operating pressure conditions. It was evaluated by adjusting the operating pressure to 100, 200, and 300 kPa under the respective water conditions in which turbidity (10, 25 NTU) and DOC (2.5, 8 mg/L) concentrations were adjusted. As a result, the flux was more decreased as the operating pressure, turbidity and DOC concentrations increased. In addition, the recovery rate of physical backwash was 12.1 ~ 67.9%, depending on the water qualities and operating pressure conditions. In high turbidity((B) condition), the physical recovery was verified to be less than about 23%, and the irreversible fouling (Rf) was 35-41%, the highest compared to (A) and (B) conditions. On the other hand, membrane fouling formed at high DOC ((C) water quality) showed reversible fouling (Rc) of more than 87%. For distributed water supply systems with limited site area and installation space, it is considered appropriate to apply ceramic membranes that can be operate at high flux. It is thought that more efficient facility operation will be possible through suitable physical backwashing cycle setting according to water quality and operating pressure conditions.
Cover Requirements for Corrugated HDPE and PVC Pipes Used for Cross-drains in Highway Construction
강준석,임정현,강영종,Kang, Junsuk,Davidson, James S.,Lim, Jeong-Hyeon,Kang, Young Jong Korean Society for Advanced Composite Structures 2013 복합신소재학회논문집 Vol.4 No.1
This project investigated the use of two types of thermoplastic pipes, High-Density Polyethylene (HDPE) and Poly-vinyl Chloride (PVC), as cross-drains under highways. Pipes ranging from 0.3 m (12 in.) to 1.5 m (60 in.) in diameter were evaluated under deep fills, minimum cover, and construction loads. In addition to a comprehensive literature review, an analytical study into the allowable fill heights for thermoplastic pipes and a field study to observe the installation and performance of the pipe in service conditions were conducted. Based on the study findings, recommendations regarding how and when thermoplastic pipe should be installed are provided.