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Analysis of Membrane Integrity and Removal Efficiency Considering Membrane Defect and Pore Size  

Hur, Hyun-chul (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government)
Rhee, Ok-jae (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government)
Lee, Kwang-jae (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government)
Kim, Kwang-ho (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government)
Choi, Young-june (Watertreatment section, Waterworks Research Institute, Seoul Metropolitan Government)
Lee, Joo-hee (Department of Civil, Environmental and Architectural Engineering, Korea University)
Hong, Seungkwan (Department of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Society on Water Environment / v.24, no.4, 2008 , pp. 423-429 More about this Journal
Abstract
Microfiltration (MF) and ultrafiltration (UF) processes for removal of particulate materials (i.e., turbidity, microorganisms and viruses) have been used to produce drinking water with higher quality. As membrane filtration technique has become widely applied for drinking water treatment, the importance of membrane integrity test (MIT) has also been increasingly emphasized. The results of pressure decay test (PDT) were presented in the paper to monitor membrane integrity. In this paper the PDT was carried out with deliberately-defected membrane fibers to evaluate the sensitivity of PDT on membrane fiber damage. Variation of pressure decay rate and removal rate were investigated to evaluate the impact of defection (defection ratio) and pore size of membrane. The membrane integrity could be successfully monitored by the PDT. The pressure decay rate varied from $0.002{\sim}0.189kg_f/cm^2hr$ with the initial pressure ranged from 0.2 to $1.0kg_f/cm^2hr$. Higher initial pressure which provided with higher pressure decay rate was preferred to evaluate the defection of membrane fiber. As for the particle removal rate, the Log Removal Rate (LRV) of kaolin solution decreased significantly from 3.78 to 2.31 when one fiber out of 3,200 fibers was cut. The membranes with different pore size were tested to evaluate virus removal efficiency. The virus removal rate of the MF membrane ($0.1{\mu}m$) was about 30% although the poliovirus was smaller than the pore size of the MF membrane, indicating that the removal rate was much lower than Korea Water Works Association (KWWA) certificate LRV of 1.5.
Keywords
Membrane integrity; Micro-filtration; Pressure decay test; Ultra-filtration; Virus removal;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Cote, P., Cadera, J., Adamss, N. and Best, G. (2002). Monitoring and maintaining the integrity of immersed ultrafiltration membrane used for pathogen protection. Water Science and Technology: Water Supply, 2(5.6), pp. 307-311   DOI
2 Farahbakhsh, K. and Smith, D. (2003). Estimating air diffusion contribution to pressure decay during membrane integrity tests. AWWA Membrane Technology Conference Proceedings, March 2-5, Atlanta, GA
3 Madaeni, S. S., Fane, A. G. and Grohmann, G. S. (1995). Virus removal from water by using membranes. Journal of Membrane Science, 102, pp. 65-75   DOI   ScienceOn
4 Killington, R. A., Stokes, A. and Hierholzer, J. C. (1996). Virus purification, Virology methods manual, B. W. J. Mahy and H. O. Kangro (eds.), Academic press, London, pp. 71-90
5 US EPA (2005). Membrane filtration guidance manual, EPA 815-R-06-009
6 Fout, G. S., Schaefer III, F. W., Messer, J. W., Dahling, D. R. and Stetler, R. E. (1996). Virus monitoring protocol for the ICR, ICR microbial laboratory manual. USEPA, pp. VIII-1 - VIII-67
7 Hong, S. K., Miller, F. A. and Taylor, J. S. (2001). Assessing pathogen removal efficiency of microfiltration by monitoring membrane integrity. Water Science and Technology: Water Supply, 1(4), pp. 43-48
8 Johnson, W. T. (1997). Predicting log removal performance of membrane systems using in-situ integrity testing. AWWA Annual Conference Proceedings, June 15-19, Atlanta, GA
9 Safferman, R. S. (1988). US EPA manual of methods for virology, US EPA