Modes of Natural Organic Matter Fouling during Ultrafiltration

Taniguchi, Masahide; Kilduff, James E.; Belfort, Georges

doi:10.1021/es020555p

Cited by 141 publications

(73 citation statements)

References 32 publications

(56 reference statements)

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“…The factors influencing membrane fouling by NOM have been comprehensively reviewed 37 (Taniguchi et al, 2003;Zularisam et al, 2006). They include properties of the NOM (composition, 38 size, hydrophobicity, charge), the membrane (hydrophobicity, charge, surface roughness), the 39 solution (pH, ionic strength, hardness ion concentration) and the hydrodynamics of the membrane 40 system (solution flux, surface shear).…”

Section: Introduction 35 36mentioning

confidence: 99%

Effect of membrane character and solution chemistry on microfiltration performance

Gray

Ritchie²,

Tran

et al. 2008

Water Research

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14To help understand and predict the role of natural organic matter (NOM) in the fouling of low-15 pressure membranes, experiments were carried out with an apparatus that incorporates automatic 16 backwashing and long filtration runs. Three hollow fibre membranes of varying character were 17 included in the study, and the filtration of two different surface waters was compared. The 18 hydrophilic membrane had greater flux recovery after backwashing than the hydrophobic 19 membranes, but the efficiency of backwashing decreased at extended filtration times. NOM 20 concentration of these waters (7.9 and 9.1 mg/L) had little effect on the flux of the membranes at 21 extended filtration times, as backwashing of the membrane restored the flux to similar values 22 regardless of the NOM concentration. The solution pH also had little effect at extended filtration 23 times. The backwashing efficiency of the hydrophilic membrane was dramatically different for the 24 two waters, and the presence of colloid NOM alone could not explain these differences. It is 25proposed that colloidal NOM forms a filter cake on the surface of the membranes and that small 26 molecular weight organics that have an adsorption peak at 220 nm but not 254 nm were responsible 27 for "gluing" the colloids to the membrane surface. Alum coagulation improved membrane 28 performance in all instances, and this was suggested to be because coagulation reduced the 29 concentration of "glue" that holds the organic colloids to the membrane surface. 30 31

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Section: Introduction 35 36mentioning

confidence: 99%

Effect of membrane character and solution chemistry on microfiltration performance

Gray

Ritchie²,

Tran

et al. 2008

Water Research

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show abstract

“…Many factors affect membrane fouling by natural organic matter (NOM), including the nature of the NOM (size, hydrophobicity, charge), the membrane (hydrophobicity, charge, surface roughness), the solution (pH, ionic strength, hardness ion concentration) and the hydrodynamics of the membrane system (solution flux, surface shear) (Taniguchi et al 2003). In a study of hollow fibre microfiltration (MF) membranes treating two surface water sources (Gray et al 2007), we have explored varying solution conditions such as NOM concentration, the ionic strength and the pH level, as well as the improvement gained by prior alum treatment, a topic that has been reviewed recently (Farahbakhsh et al.…”

Section: Introduction 28mentioning

confidence: 99%

Effect of NOM characteristics and membrane type on microfiltration performance

Gray

Ritchie²,

Tran

et al. 2007

Water Research

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Efforts to understand and predict the role of different organic fractions in the fouling of low-pressure membranes are presented. Preliminary experiments with an experimental apparatus that incorporates automatic backwashing and filtration over several days has shown that microfiltration of the hydrophilic fractions leads to rapid flux decline and the formation of a cake or gel layer, while the hydrophobic fractions show a steady flux decline and no obvious formation of a gel or cake layer. The addition of calcium to the weakly hydrophobic acid (WHA) fraction led to the formation of a gel layer from associations between components of the WHA. The dominant foulants were found to be the neutral and charged hydrophilic compounds, with hydrophobic and small pore size membranes being the most readily fouled. The findings suggest that surface analyses such as FTIR will preferentially identify hydrophilic compounds as the main foulants, as these components form a gel layer on the surface while the hydrophobic compounds adsorb within the membrane pores.Furthermore, coagulation pre-treatment is also likely to reduce fouling by reducing pore constriction rather than the formation of a gel layer, as coagulants remove the hydrophobic compounds to a large extent and very little of the hydrophilic neutral components.

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“…R T is the hydraulic resistance of the membrane (m -1 ), J is the peat water flux (Lm -2 h -1 bar -1 ), ΔP is the transmembrane pressure (bar) and µ is the viscosity of solution (bar.h) [19]. The flux of the resulted polysulfone membranes was measured in our previous work [18] and was used to calculate the hydraulic resistance (R T ).…”

Section: Hydraulic Resistance Of Polysulfone Membrane During Peat Watmentioning

confidence: 99%

The Influence of PEG400 and Acetone on Polysulfone Membrane Morphology and Fouling Behaviour

Aryanti

Joscarita

Wardani

et al. 2016

J. Eng. Technol. Sci.

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Abstract. Modification of polysulfone ultrafiltration membrane was conducted by blending polysulfone with PEG400 and acetone as additives. The influence of each additive on the resulted membrane morphology and fouling characteristics were investigated. The experimental results showed that the hydrophilicity of the polysulfone membrane was improved by the increase of PEG400 in the polysulfone membrane. The water contact angle of the membrane was decreased from 76.1° to 38.31° when 35 %wt of PEG400 was added into the polysulfone solution, while the water content of the membrane was increased by around 38%. The high concentration of PEG400 in the polysulfone solution led to the formation of longer finger-like cavities in the membrane structure and resulted in a thicker membrane skin layer. The high concentration of PEG400 also contributed to the increase in hydraulic resistance of the membrane due to organic matter fouling. This problem could be minimized by the addition of acetone into the polysulfone solution, which resulted in a lower fouling resistance of organic matter during up to five hours of peat water filtration.

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Modes of Natural Organic Matter Fouling during Ultrafiltration

Cited by 141 publications

References 32 publications

Effect of membrane character and solution chemistry on microfiltration performance

Effect of membrane character and solution chemistry on microfiltration performance

Effect of NOM characteristics and membrane type on microfiltration performance

The Influence of PEG400 and Acetone on Polysulfone Membrane Morphology and Fouling Behaviour

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