Applications of the MFI-UF to measure and predict particulate fouling in RO systems

Boerlage, Śiobhàn F.E.; Kennedy, Maria D.; Aniye, Meseret Petros; Schippers, Jan C.

doi:10.1016/s0376-7388(03)00222-9

Cited by 96 publications

(54 citation statements)

References 26 publications

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“…However, SDI can only be used as a method to measure and predict the particulate fouling potential of feed water [13], not the organic and biofouling potential. Therefore, the overall aims of this paper are to: firstly, understand AOC compounds in seawater and pretreated seawater samples for developing a suitable and an accurate detection and assessment method of biofouling; and secondly, develop a suitable biofouling index to represent the AOC.…”

Section: Introductionmentioning

confidence: 99%

Practical use of standard pore blocking index as an indicator of biofouling potential in seawater desalination

Jeong

Vigneswaran

2015

Desalination

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Section: Introductionmentioning

confidence: 99%

Practical use of standard pore blocking index as an indicator of biofouling potential in seawater desalination

Jeong

Vigneswaran

2015

Desalination

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“…SDI has its limitations, and a lack of reliability has been demonstrated in several studies [31][32][33]. SDI is a estatic measurement of resistance assuming lineal permeate flux decline.…”

Section: Silt Density Index (Sdi)mentioning

confidence: 99%

A Critical Review on Predicting Fouling in RO Desalination

Ruiz-García¹,

Melián-Martel²,

I³

2017

Preprint

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RO membrane fouling is one of the main challenges that membrane manufactures, the scientific community and industry professionals have to deal with. The consequences of this inevitable phenomenon have a negative effect on the performance of the desalination system. Predicting fouling in RO systems is key to evaluating the long-term operating conditions and costs. Much research has been done on fouling indices, methods, techniques and prediction models to estimate the influence of fouling on the performance of RO systems. This paper offers a critical review evaluating the state of industry knowledge in the development of fouling indices and models in membrane systems for desalination in terms of use and applicability. Despite major efforts in this field, there are gaps in terms of effective methods and models for the estimation of fouling in full-scale RO desalination plants. In existing models applied to full-scale RO desalination plants, neither the spacer geometry of membranes nor the efficiency and frequency of chemical cleaningswhich play an important role in the performance of this process -are considered.

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“…In addition, the membrane surface and pores have a negative charge and, when contacted with water, cause a polar medium which develops a double layer. Therefore, an increase of ionic strength may cause compression of the double layer around the particles and membrane surface which lead to an increase of specific cake resistance [7]. These considerations might be valid for hydrophobic particles which get their stability from the charge.…”

Section: Effect Of Salinity On Particlesmentioning

confidence: 99%

“…Boerlage et al [7] tested the effect of salinity on tap water in the range of 0 to 0.2 mol/L, and observed a peak value at 0.1 mol/L. Boerlage explained that ionic strength causes an initial increase in specific cake resistance due to a reduction in cake porosity which is caused by a decrease in the inter-particle distance between particles in cake filtration.…”

Section: Effect Of Salinity On Particlesmentioning

confidence: 99%

The Modified Fouling Index Ultrafiltration constant flux for assessing particulate/colloidal fouling of RO systems

et al. 2015

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A safe MFI value has been defined for RO feed water.• A new portable set-up can perform MFI-UF tests at constant flux filtration.• Low filtration flux and membrane pore size are important variables in the test.• The MFI-UF constant flux can assess pre-treatment of RO systems.• Measuring the deposition factor is important to estimate the rate of RO fouling. a b s t r a c tReliable methods for measuring and predicting the fouling potential of reverse osmosis (RO) feed water are important in preventing and diagnosing fouling at the design stage, and for monitoring pre-treatment performance during plant operation. The Modified Fouling Index Ultrafiltration (MFI-UF) constant flux is a significant development with respect to assessing the fouling potential of RO feed water. This research investigates (1) the variables influencing the MFI-UF test at constant flux filtration (membrane pore size, membrane material, flux rate); and (2) the application of MFI-UF into pre-treatment assessment and RO fouling estimation. The dependency of MFI on flux, means that to assess accurately particulate fouling in RO systems, the MFI should be measured at a flux similar to a RO system (close to 20 L/m 2 /h) or extrapolated from higher fluxes. The two studied membrane materials showed reproducible results; 10% for PES membranes and 6.3% for RC membranes. Deposition factors (amount of particles that remain on the surface of membrane) were measured in a full-scale plant ranging between 0.2 and 0.5. The concept of "safe MFI" is presented as a guideline for assessing pre-treatment for RO systems.

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Applications of the MFI-UF to measure and predict particulate fouling in RO systems

Cited by 96 publications

References 26 publications

Practical use of standard pore blocking index as an indicator of biofouling potential in seawater desalination

Practical use of standard pore blocking index as an indicator of biofouling potential in seawater desalination

A Critical Review on Predicting Fouling in RO Desalination

The Modified Fouling Index Ultrafiltration constant flux for assessing particulate/colloidal fouling of RO systems

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