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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2017.27.3.248

Evaluation of Membrane Damage Sensitivity by Defect Types for Improving Reliability of Membrane Integrity Monitoring  

Lee, Yong-Soo (Department of Civil and Environmental Engineering, Hanyang University)
Kang, Ha-Young (Department of Civil and Environmental Engineering, Hanyang University)
Kim, Hyung-Soo (Department of Water Resources, Sungkyunkwan University)
Kim, Jong-Oh (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Membrane Journal / v.27, no.3, 2017 , pp. 248-254 More about this Journal
Abstract
In order to secure the reliability of pathogenic microorganisms such as Cryptosporidium and Giaridia, which are chlorophilic protozoans, membrane filtration systems have been widely used in water purification process. hese integrity tests are classified into direct and indirect methods. Based on the bubble point theory, the pressure-based test in the direct method is presented in the USEPA Guidance Manual with sensitivity to detect a minimum size of pathogenic microorganisms of $3{\mu}m$ or more. Indirect methods are widely used in that they are capable of continuous operation in on-line state, but there is a very low sensitivity of damage detection compared to the direct method, and there is a limit that can not specify the damage area, so it is necessary to improve this sensitivity. In this study, we compared the LRVDIT and UCL values according to the type of membrane defect, number of fiber breaks, and initial set pressure value through the Integrity Test by Pressure Decay Test (PDT).
Keywords
Membrane Integrity Test; Pressure Decay Test; Log Removal Value; Upper Control Limit; Defect Types;
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