Effect of calcium ion on the fouling of nanofilter by humic acid in drinking water production

Yoon, Seongwon; Lee, Chung‐Hak; Kim, Kyu-Jin; Fane, Anthony G.

doi:10.1016/s0043-1354(97)00416-8

Cited by 146 publications

(61 citation statements)

References 10 publications

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“…Hence formed a more compact fouling layer (shown in Fig. 6d) with higher resistance [32,41], which resulted in further permeate flux reduction. Fig.…”

Section: Membrane Fouling and Permeate Flux Performancementioning

confidence: 99%

Perfluorooctane sulfonate removal by nanofiltration membrane—the effect and interaction of magnesium ion / humic acid

Zhao

Tang

et al. 2016

Journal of Membrane Science

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a b s t r a c tAlthough the presence of perfluorooctane sulfonate (PFOS) in environmental systems has generated widespread interest, little information is available on PFOS removal from surface water by membrane technology. Herein, a novel nanofiltration membrane (NF270) was investigated so as to remove PFOS. More specifically, the interaction and effect of Mg 2 þ ion and/or humic acid (HA) in the feed solution on PFOS removal efficiency and total permeate flux were examined. Under 0.8 MPa, an improvement in PFOS rejection efficiency from 94.3% to 99.5% was observed when the concentration of Mg 2 þ ion was increased from 0-2 mM in the feed solution. This enhancement is attributed to enhanced size exclusion because PFOS molecules are linked together by Mg 2 þ ion, as shown by Density Functional Theory (DFT)calculation. The result shows that Mg 2 þ ion can more easily neutralize two PFOS anion than one PFOS anion on the basis of the Gibbs free energy changes. Conversely, the presence of HA had minimal improvement on PFOS rejection because HA had much weaker ability to bind with PFOS comparing to Mg 2 þ . Consequently, The further interaction between Mg 2 þ and the carboxylic groups of HA molecule, carboxylic group or amino group of NF270 membrane was also calculated via DFT theory. Corresponding DFT structures and calculation parameters of Mg 2 þ with different groups were obtained. These findings indicate that the size exclusion mechanism primarily governs PFOS removal by the NF270 membrane. Flux results showed that the co-presence of Mg 2 þ ion and HA in the feed solution resulted in the most flux reduction, by 70%, that was associated with the thickest fouled layer.

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“…Hence formed a more compact fouling layer (shown in Fig. 6d) with higher resistance [32,41], which resulted in further permeate flux reduction. Fig.…”

Section: Membrane Fouling and Permeate Flux Performancementioning

confidence: 99%

Perfluorooctane sulfonate removal by nanofiltration membrane—the effect and interaction of magnesium ion / humic acid

Zhao

Tang

et al. 2016

Journal of Membrane Science

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“…On the other hand, in addition to the oxidation process Photo catalytic oxidation, coagulation process is performed by Iron ions then increases the efficiency of the process. There are a function of calcium ion bridging between the dissolved organic carbon in solution and the DOC adsorbed on the surface of TiO2 (Yoon et al, 1998). , pH=3, Time=60min.…”

Section: Effect Of Iron Ionmentioning

confidence: 99%

The effect of Iron Ion on Removal Efficiency of Dissolved Organic Carbon (DOC) Using UV/TiO2

2016

Global NEST Journal

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Most of water sources throughout the world contain natural organic matter (NOM), which is the best description as a complex mixture of organic compounds. The effect of iron ion on removal efficiency of dissolved organic carbon (DOC) using UV/TiO2 photo catalytic oxidation (TiO2) was examined. In this quasiexperimental study, the different variables such as pH value, contact time, various concentrations of TiO2, FeCl2 on the removal efficiency of DOC by the UV/TiO2 on raw water of Zayandehroud in Isfahan were studied. The results were analyzed by using Pearson correlation coefficient test and SPSS software. Removal efficiency DOC improved as the amount of catalyst was increased. Maximum removal efficiency was achieved during acidic conditions (pH=3) within 60 minutes of contact time. The removal efficiency of DOC by the UV/TiO2 decreased with increase of contact time. The presence of iron ions increased the rate of DOC removal by the UV/TiO2. Removal efficiency of dissolved organic carbon increased when ionic strength and initial concentration of Ferric Chloride was increased. Also, by adding particles of Ferric Chloride, Removal of dissolved organic carbon increased to 98% in comparison with absence of iron ion (78%).

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“…Specifically, it has been suggested (Yoon et al, 1998) that, at high ionic concentrations, there may be a reduction in the electrostatic forces inside the membrane (i.e. reduced repulsion) which may cause a reduction of the actual size of the pores, leading to a reduced membrane permeability; consequently, a better rejection of pesticides accompanied by a reduced water flux could be observed.…”

Section: Influence Of the Ionic Environmentmentioning

confidence: 99%

Membrane Treatment of Potable Water for Pesticides Removal

Karabelas¹,

Plakas²

2011

Herbicides, Theory and Applications

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Effect of calcium ion on the fouling of nanofilter by humic acid in drinking water production

Cited by 146 publications

References 10 publications

Perfluorooctane sulfonate removal by nanofiltration membrane—the effect and interaction of magnesium ion / humic acid

Perfluorooctane sulfonate removal by nanofiltration membrane—the effect and interaction of magnesium ion / humic acid

The effect of Iron Ion on Removal Efficiency of Dissolved Organic Carbon (DOC) Using UV/TiO2

Membrane Treatment of Potable Water for Pesticides Removal

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