Quantification of the defect size of ultrafiltration membrane system using mathematical model

Wang, Song Lin; Lü, Xin-You; Zhou, Ning; Xiong, Wen Cheng; Zhang, Qi; Zhi, Yang

doi:10.1016/j.desal.2015.04.007

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Therefore, the modified coefficient ω in Equation (4b) was assumed to be equivalent to 0. Wang et al [20] had come up with similar results and given a reasonable explanation. Therefore, in the simulation in this study, the effect of the membrane deformation properties on defect size was ignored.…”

Section: Membrane Damage Characterizationmentioning

confidence: 58%

“…It was found that the pressure value of the gas chamber did not obviously decline. For example, with the conditions of water depth 30 mm, gas chamber volume 365.59 mL, and original applied pressure 95.48 kPa, the pressure declined from 95.48 kPa to 94.60 kPa after 100 s. This pressure decay can be mainly attributed to gas diffusion through intact pores [20], proving that the experimental system was intact, airtight, and sealed hermetically. Figure 4 shows the time dependence of gas chamber pressure and PDR of different needle sizes (0.20 mm, 0.22 mm, 0.30 mm, and 0.35 mm).…”

Section: Effects Of Defect Size On Gas Chamber Pressure and Pdrmentioning

confidence: 92%

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A Novel Model of Pressure Decay in Pressure-Driven Membrane Integrity Tests Based on the Bubble Dynamic Process

Wang

Ding

et al. 2019

Applied Sciences

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The membrane integrity is estimated using a pressure decay test based on the bubble dynamic process of membrane defects. The present work builds a schematic diagram for a bubble formation model of a pressure decay test, proposes a simulation model of pressure decay rate (PDR) in the membrane gas chamber by means of numerical simulation using microdefect bubble dynamic behavior, and tries to establish the main factors influencing the back-calculated defect size resolution. Results obtained from the variations in the membrane gas chamber pressure and the PDR allowed for accurate determination of the membrane defect size, and the PDR was found to be relatively dependent on the gas chamber volume and the initial applied test pressure. The measured data about PDR using controlled experimental parameters was in good agreement with the trend found in the prediction model, proving that the pressure decay test process is in essence a bubble dynamic process. Furthermore, the back-calculated defect size resolution was found to decrease with the increase in gas chamber volume and PDR as well as with the decrease in applied pressure.

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Section: Membrane Damage Characterizationmentioning

confidence: 58%

Section: Effects Of Defect Size On Gas Chamber Pressure and Pdrmentioning

confidence: 92%

A Novel Model of Pressure Decay in Pressure-Driven Membrane Integrity Tests Based on the Bubble Dynamic Process

Wang

Ding

et al. 2019

Applied Sciences

Self Cite

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“…막여과 공정이 정수처리 시설에 도입되는 가장 큰 이유 중 하나는 크립토스포리디움(Cryptosporidium parvum)과 지아디아(giardia) 등의 병원성 미생물이나 탁도 에 대한 높은 제거율로 인한 안정적인 수질공급이 가능 하기 때문인데, 이는 막완결성이 확보되어야만 보장할 수 있다 [4]. 따라서 막여과 운전을 하는 동안 막 손상이 나 파단의 발생에 대하여 막여과 공정 시스템에서 정확 하게 판단할 수 있어야 한다 [5] 1차 측 압력손실시험을 수행할 때 △P는 압력계의 최 저감도한계값, α는 P max 까지 가압하는 모듈수를 말하 고, β는 손상된 막으로 시간에 따른 누출공기량(L/min) 과 T(min)의 압력손실시험 시간과의 관계로 질량을 나 타낼 수 있다 [10]. 위의 식…”

Section: 서 론 1)unclassified

Influencing Factors on Sensitivity of Pressure Decay Test for Membrane Damage Assessment

Kim¹,

Lee²,

Soo³

2017

membr. J.

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Pressurized membrane module systems, including hollow fiber type of Microfiltration (MF) and Ultrafiltration (UF) membranes are being increasingly used in drinking water treatment due to their high removal efficiency of pathogen. However, when fibers are damaged in pressurized membrane system, the pathogen will be able to penetrate the membrane. Therefore, it is essential to guarantee the regulatory requirements for water quality by an effective on-line or off-line condition integrity monitoring methods. Recently, pressure decay test (PDT) which is one of membrane integrity tests has been reflected to drinking water treatment plants using pressurized membrane module. In this paper, three different method were used to perform PDT and three different sensitivity values were analyzed through experiments. Three types of direct integrity test methods were applied to pressure feed side, filtrate side and bidirectional pressure decay test. The results of these experiments show that the sensitivity was increasing when the volume of pressurized gas was decreasing. The sensitivity is inversely proportional to the gas volume. Furthermore, it is desirable to increase pressure difference between feed side and permeate side in order to achieve higher sensitivity in the PDT by membrane damage.

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Role of inorganic foulants in the aging and deterioration of low-pressure membranes during the chemical cleaning process in surface water treatment: A review

Khan,

Kim

2023

Chemosphere

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Quantification of the defect size of ultrafiltration membrane system using mathematical model

Cited by 4 publications

References 26 publications

A Novel Model of Pressure Decay in Pressure-Driven Membrane Integrity Tests Based on the Bubble Dynamic Process

A Novel Model of Pressure Decay in Pressure-Driven Membrane Integrity Tests Based on the Bubble Dynamic Process

Influencing Factors on Sensitivity of Pressure Decay Test for Membrane Damage Assessment

Role of inorganic foulants in the aging and deterioration of low-pressure membranes during the chemical cleaning process in surface water treatment: A review

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