Fouling effects of humic and alginic acids in nanofiltration and influence of solution composition

Zazouli, Mohammad Ali; Nasseri, Simin; Ulbricht, Mathias

doi:10.1016/j.desal.2009.05.021

Cited by 88 publications

(37 citation statements)

References 14 publications

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“…Firstly, the electric double layer around negatively charged alginate molecules was compressed at higher ionic strength, resulting in the decreased electrostatic repulsion between alginate molecules and membrane surface [6,11]. Secondly, alginate molecules became more coiled at higher ionic strength because of the reduced interchain electrostatic repulsion, reducing the size of the molecules in solution [12].…”

Section: In the Presence Of Iron/alum Salt With Ionic Strengthmentioning

confidence: 99%

“…At higher ionic strength, the electric double layer around the negatively charged alginate molecules was compressed [10]. As a result, alginate molecules become more coiled due to the reduced electrostatic repulsion [11,12]. Up to now, many studies have reported that alginate could accelerate membrane fouling at high ionic strength, owning to more chances of alginate molecules depositing onto the membrane surface even blocking the membrane pores [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of iron (III) and alum salt on ultrafiltration membrane fouling by alginate

Ma¹,

Yu²,

Liu³

et al. 2014

Desalination

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• Sodium ions exacerbate the fouling caused by alginate coagulated with iron/alum salt.• Calcium ions mitigate the fouling caused by alginate coagulated with iron/alum salt.• Flux decline is depended on the ratio of sodium ions to calcium ions in the system.• Alum salt behaves better than iron salt when membrane fouling is caused by alginate. G R A P H I C A L A B S T R A C Ta b s t r a c t a r t i c l e i n f o Compared with humic acids or proteins, polysaccharides usually cause more severe flux decline. Here, the ultrafiltration (UF) membrane fouling caused by alginate coagulated with iron (III)/alum salt was investigated in the absence/presence of ionic strength (NaCl), calcium ions and their combinations in the system. The results showed that flux decline was significantly reduced only in the presence of high dose of iron/alum salt. With increasing ionic strength, the membrane flux caused by alginate coagulated with high dose of iron/alum salt was decreased, while that was dramatically increased in the presence of calcium ions. When ionic strength and calcium ions were presented with high dose of iron/alum salt, flux decline was determined by the ratio of sodium ions to calcium ions. Alum salt behaved much better than iron salt on reducing membrane fouling with/without ionic strength, calcium ions and their combinations in the solution. Membrane flux was high at coagulation conditions that resulted in low concentration of alginate after filtration, which was in the presence of high dose of alum salt, especially in combination of calcium ions.

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Section: In the Presence Of Iron/alum Salt With Ionic Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of iron (III) and alum salt on ultrafiltration membrane fouling by alginate

Ma¹,

Yu²,

Liu³

et al. 2014

Desalination

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“…There are many different substances which co-exist in the complex natural water. Now more and more studies have focused on two or more contaminants in the solution, and some different pollution mechanisms have really been found compared to only one single pollutant in feed water (Jermann et al, 2007;Katsoufidou et al, 2010;Zazouli et al, 2010). Humic acid (HA) and bovine serum albumin (BSA) are used as model contaminants for their widely application in many studies (Tang and Leckie, 2007;Mo et al, 2008;Listiarini et al, 2009;She et al, 2009;Huber et al, 2011;Wang and Tang, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Liu

et al. 2014

Water Research

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Low dosageCritical dose Ultrafiltration Flux decline a b s t r a c t One of the critical issues for the widely application of ultrafiltration (UF) in water treatment is membrane fouling owning to the dissolved organic matter. The aim of the present study is to explore the effect of various particle sizes caused by low dosages of coagulant with dissolved organic matter on the UF membrane performance. Aluminum chloride was added to the synthetic water with the hydrophobic humic acid (HA), the hydrophilic bovine serum albumin (BSA) e a protein-and their 1:1 (mass ratio) mixture. The results showed that there was a critical dose of Al that could cause dramatic flux reduction by blocking the membrane pores after coagulating with HA/BSA. For HA or BSA, the critical dose of Al was relatively lower at pH 6.0 than that at pH 8.0. After coagulation, the flux decline caused by HA was slightly varied as a function of pH while that caused by BSA was greatly affected by pH. The flux decline caused by the 1:1 (mass ratio) HA/BSA mixture after coagulation was similar to that caused by HA after coagulation because BSA could be encapsulated by HA. In addition, the peak value of the molecular weight (MW) distribution of HA coagulated with Al was changed more drastically compared to that of BSA after filtration. ª

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“…Using model organic foulants to investigate the fouling behavior is a common method employed in microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) [4,5]. Humic acid (HA), bovine serum albumin (BSA) and sodium alginate (SA) are used as representative compounds of DOMs.…”

Section: Introductionmentioning

confidence: 99%

Identification of key factors affecting the organic fouling on low-pressure ultrafiltration membranes

Xiao

Zhang

et al. 2013

Journal of Membrane Science

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Fouling effects of humic and alginic acids in nanofiltration and influence of solution composition

Cited by 88 publications

References 14 publications

Comparison of iron (III) and alum salt on ultrafiltration membrane fouling by alginate

Comparison of iron (III) and alum salt on ultrafiltration membrane fouling by alginate

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Identification of key factors affecting the organic fouling on low-pressure ultrafiltration membranes

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