Predicting log removal performance of membrane systems using in-situ integrity testing

Johnson, Warren T.

doi:10.1016/s0015-1882(97)83111-4

Cited by 20 publications

(9 citation statements)

References 2 publications

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“…Because of its large active area combined with a small footprint, hollow fiber modules have great potential in commercial applications [33]. Although broken hollow fibers cannot be replaced, they can be detected by the liquid decay test (LDT) [38][39][40] and pinned to remove broken fibers from service. Good flow distribution on the shell side can be difficult to achieve, with subsequent high degrees of temperature polarization.…”

Section: Configurations Of MD Modulesmentioning

confidence: 99%

Advances in Membrane Distillation for Water Desalination and Purification Applications

Camacho

Dumée

Zhang

et al. 2013

Water

643

342

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Membrane distillation is a process that utilizes differences in vapor pressure to permeate water through a macro-porous membrane and reject other non-volatile constituents present in the influent water. This review considers the fundamental heat and mass transfer processes in membrane distillation, recent advances in membrane technology, module configurations, and the applications and economics of membrane distillation, and identifies areas that may lead to technological improvements in membrane distillation as well as the application characteristics required for commercial deployment. Keywordsa function of temperature, vapor pressure, and of the gas molecular mass K 0 membrane characteristic defined by Equation (9) Kn Knudsen number K(T) a function of temperature and molecular weight of the gas l mean free path of the molecules l m distance between parallel spacer fibres (m) LEP Limit Entry Pressure (kPa) M molecular mass (g/mol) M w molecular weights of water (g/mol) M a molecular weights of air (g/mol) n number of CNTs per unit cross section in bucky-paper P pressure in the air gap (kPa) half time to reach the maximum intensity-laser flash technique (s) t proportion of conductive heat (balance due to evaporative heat) loss through the membrane T mean temperature in the pores (K)

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Section: Configurations Of MD Modulesmentioning

confidence: 99%

Advances in Membrane Distillation for Water Desalination and Purification Applications

Camacho

Dumée

Zhang

et al. 2013

Water

643

342

View full text Add to dashboard Cite

show abstract

“…PDT is first used to detect any breaches in the module, and AST is then used to accurately pinpoint the location of the defect so the membrane can be isolated for replacement or repairs (Johnson, 1998). This technique entails the use of an accelerometer to detect the vibrations generated by air leaks in the membrane module.…”

Section: Acoustic Sound Testmentioning

confidence: 99%

Membrane ageing during water treatment

Tng

Antony

Wang

et al. 2015

Advances in Membrane Technologies for Water Treatment

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“…Indirect methods are surrogate measures of integrity that involve filtrate water quality monitoring such that a significant decline in filtrate quality may indicate an integrity problem. Both direct integrity testing and continuous indirect integrity monitoring are required for compliance with US EPA regulations (13)(14)(15)(16)(17).…”

Section: Chemical Cleaningmentioning

confidence: 99%

“…(12): Generally, in order to identify changes in productivity (as measured by flux) that are specifically attributable to membrane fouling, it is desirable to normalize the flux for pressure as well as temperature, as shown in Eq. (13). Note that the temperature-and pressurenormalized flux is often referred to as either the specific flux or permeability.…”

Section: Mf Uf and Mcf Processesmentioning

confidence: 99%

Membrane Systems Planning and Design

Shammas

Wang

2010

Membrane and Desalination Technologies

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The purpose of this chapter is to provide the basic information on the use of membrane filtration and application of the technology in the design of potable water facilities. The main issues involved in the planning and design of membrane systems are covered: pilot testing; the considerations that influence system design and operation including operational unit processes, system design considerations, and residuals treatment and disposal; and the initial start-up phase which must be completed prior to placing the system into service and actual water production. The initial start-up phase is a critical step in the successful installation of a full-scale membrane filtration system and thus is an essential consideration in the facility planning and design process. This phase includes such tasks as initial system flushing and disinfection, system diagnostic checks, membrane module installation, integrity testing new equipment, and operator training, all of which must be completed prior to placing the system into service.

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Predicting log removal performance of membrane systems using in-situ integrity testing

Cited by 20 publications

References 2 publications

Advances in Membrane Distillation for Water Desalination and Purification Applications

Advances in Membrane Distillation for Water Desalination and Purification Applications

Membrane ageing during water treatment

Membrane Systems Planning and Design

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