Effects of Natural Organic Matter and Ionic Species on Membrane Surface Charge

Membrane fouling by natural organic matter (NOM), namely by humic substances (HS), is a major problem in water treatment for drinking water production using membrane processes. Membrane fouling is dependent on membrane morphology like pore size and on water characteristics namely NOM nature. This work addresses the evaluation of the efficiency of ultrafiltration (UF) and Coagulation/Flocculation/UF performance in terms of permeation fluxes and HS removal, of the water from Tagus River (Valada). The operation of coagulation with chitosan was evaluated as a pretreatment for minimization of membrane fouling. UF experiments were carried out in flat cells of 13.2×10−4 m2 of membrane surface area and at transmembrane pressures from 1 to 4 bar. Five cellulose acetate membranes were laboratory made to cover a wide range of molecular weight cut-off (MWCO): 2,300, 11,000, 28,000, 60,000 and 75,000 Da. Severe fouling is observed for the membranes with the highest cut-off. In the permeation experiments of raw water, coagulation prior to membrane filtration led to a significant improvement of the permeation performance of the membranes with the highest MWCO due to the particles and colloidal matter removal.

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The role of membrane surface charge and solute physico-chemical properties in the rejection of organic acids by NF membranes

Journal of Membrane Science ◽

10.1016/j.memsci.2004.09.041 ◽

2005 ◽

Vol 249 (1-2) ◽

pp. 227-234 ◽

Cited By ~ 211

Author(s):

Christopher Bellona ◽

Jörg E. Drewes

Keyword(s):

Organic Acids ◽

Surface Charge ◽

Membrane Surface ◽

Chemical Properties ◽

Physico Chemical ◽

Membrane Surface Charge

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The role of membrane surface charge in the control of photosynthetic processes and the involvement of electrostatic screening

Biochimica et Biophysica Acta (BBA) - Bioenergetics ◽

10.1016/0005-2728(80)90116-4 ◽

1980 ◽

Vol 592 (1) ◽

pp. 87-102 ◽

Cited By ~ 38

Author(s):

B.T. Rubin ◽

J. Barber

Keyword(s):

Surface Charge ◽

Membrane Surface ◽

Membrane Surface Charge

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Impact of ion exchange membrane surface charge and hydrophobicity on electroconvection at underlimiting and overlimiting currents

Journal of Membrane Science ◽

10.1016/j.memsci.2016.09.038 ◽

2017 ◽

Vol 523 ◽

pp. 36-44 ◽

Cited By ~ 40

Author(s):

K.A. Nebavskaya ◽

V.V. Sarapulova ◽

K.G. Sabbatovskiy ◽

V.D. Sobolev ◽

N.D. Pismenskaya ◽

...

Keyword(s):

Ion Exchange ◽

Surface Charge ◽

Membrane Surface ◽

Ion Exchange Membrane ◽

Exchange Membrane ◽

Membrane Surface Charge

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Determination of cell membrane surface charge density by second harmonic light scattering

10.1021/scimeetings.1c00180 ◽

2021 ◽

Author(s):

Michael J. Wilhelm ◽

Hai-Lung Dai

Keyword(s):

Light Scattering ◽

Cell Membrane ◽

Charge Density ◽

Surface Charge ◽

Surface Charge Density ◽

Second Harmonic ◽

Membrane Surface ◽

Membrane Surface Charge ◽

Cell Membrane Surface

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Influential Mechanism of Natural Organic Matters with Calcium Ion on the Anion Exchange Membrane Fouling Behavior via xDLVO Theory

Membranes ◽

10.3390/membranes11120968 ◽

2021 ◽

Vol 11 (12) ◽

pp. 968

Author(s):

Zhun Ma ◽

Lu Zhang ◽

Ying Liu ◽

Xiaosheng Ji ◽

Yuting Xu ◽

...

Keyword(s):

Organic Matter ◽

Interaction Energy ◽

Anion Exchange ◽

Natural Organic Matter ◽

Calcium Ions ◽

Membrane Fouling ◽

Membrane Surface ◽

Anion Exchange Membrane ◽

Anion Exchange Membranes ◽

Exchange Membrane

The fouling mechanism of the anion exchange membrane (AEM) induced by natural organic matter (NOM) in the absence and presence of calcium ions was systematically investigated via the extended Derjaguin–Landau–Verwey–Overbeek (xDLVO) approach. Sodium alginate (SA), humic acid (HA), and bovine serum albumin (BSA) were utilized as model NOM fractions. The results indicated that the presence of calcium ions tremendously aggravated the NOM fouling on the anion exchange membrane because of Ca-NOM complex formation. Furthermore, analysis of the interaction energy between the membrane surface and foulants via xDLVO revealed that short-range acid–base (AB) interaction energy played a significant role in the compositions of interaction energy during the electrodialysis (ED) process. The influence of NOM fractions in the presence of calcium ions on membrane fouling followed the order: SA > BSA > HA. This study demonstrated that the interaction energy was a dominating indicator for evaluating the tendency of anion exchange membranes fouling by natural organic matter.

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Transport characterizations of natural organic matter in ion-exchange membrane for water treatment

Water Science & Technology Water Supply ◽

10.2166/ws.2002.0202 ◽

2002 ◽

Vol 2 (5-6) ◽

pp. 445-450 ◽

Cited By ~ 2

Author(s):

D.H. Kim ◽

S.-H. Moon ◽

J. Cho

Keyword(s):

Organic Matter ◽

Ionic Strength ◽

Ion Exchange ◽

Natural Organic Matter ◽

Membrane Surface ◽

Factors Affecting ◽

Organic Fouling ◽

Adsorbed Mass ◽

Pass Through ◽

Exchange Membrane

A series of adsorption experiments were performed to investigate the factors affecting the transport of natural organic matter (NOM) in an ion-exchange (IX) membrane. In this study, the structure of the NOM was hypothesized to be an important factor in terms of the organic fouling of IX membrane. It was found that the adsorbed mass of hydrophobic NOM constituent on the membrane surface was higher than that of either the hydrophilic or transphilic NOM constituent. NOM adsorption was seriously affected by the apparent charge of the NOM. As the apparent charge increased, NOM adsorption also significantly increased. Moreover, the molecular mass of the hydrophobic NOM acids was too high to enable them to pass through the IX membrane, and this caused an accumulated adsorption of solutes on the membrane surface, i.e. NOM fouling. In addition, both pH and ionic strength affected NOM adsorption on the surface of the IX membrane. Lower NOM adsorption resulted from a lower pH and a higher ionic strength.

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Investigation of membrane fouling by synthetic and natural particles

Water Science & Technology ◽

10.2166/wst.2004.0724 ◽

2004 ◽

Vol 50 (12) ◽

pp. 279-285 ◽

Cited By ~ 1

Author(s):

J.H. Kweon ◽

D.F. Lawler

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Membrane Fouling ◽

Membrane Surface ◽

Research Articles ◽

Clay Material ◽

Dramatic Effect ◽

Flux Decline ◽

Scanning Electron

The biggest impediment for applying membrane processes is fouling that comes from mass flux (such as particle and organic matter) to the membrane surface and its pores. Numerous research articles have indicated that either particles or natural organic matter (NOM) has been the most detrimental foulant. Therefore, the role of particles in membrane fouling was investigated with two synthetic waters (having either particles alone or particles with simple organic matter) and a natural water. Membrane fouling was evaluated with flux decline behavior and direct images from scanning electron microscopy. The results showed that the combined fouling by kaolin and dextran (a simple organic compound selected as a surrogate for NOM) showed no difference from the fouling with only the organic matter. The similarity might stem from the fact that dextran (i.e., polysaccharide) has no ability to be adsorbed on the clay material, so that the polysaccharide behaves the same with respect to the membrane with or without clay material being present. In contrast to kaolin, the natural particles showed a dramatic effect on membrane fouling.

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