Role of backwash water composition in alleviating ultrafiltration membrane fouling by sodium alginate and the effectiveness of salt backwashing

Chang, Haiqing; Liang, Heng; Qu, Fangshu; Shao, Senlin; Yu, Hui; Liu, Bin; Gao, Wei

doi:10.1016/j.memsci.2015.10.062

Cited by 70 publications

(30 citation statements)

References 42 publications

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“…The results of the SEM characterization are shown in In this study, the profile of water permeability is predicted while using the mathematical models, as in Equations (29) and (30).…”

Section: Membrane Characteristicmentioning

confidence: 99%

“…In summary, the presence of Ca 2+ and Mg 2+ ions in the feeds accelerates membrane fouling. They decrease SA charge, and influence the adhesion force between the SA particles and the membrane surface, which turns to accelerate the membrane fouling [30]. The other reason is due to the nature of the Ca ion, which has a special property to the carboxylic group to form an aggregate with a larger molecular size [31].…”

Section: Filtration Of Sodium Alginate Solutionmentioning

confidence: 99%

“…decrease SA charge, and influence the adhesion force between the SA particles and the membrane 265 surface, which turns to accelerate the membrane fouling [30]. The other reason is due to the nature of…”

mentioning

confidence: 99%

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The Effect of Ca and Mg Ions on the Filtration Profile of Sodium Alginate Solution in a Polyethersulfone-2-(methacryloyloxy) Ethyl Phosphorylchloline Membrane

Arahman

Satria

Razi

et al. 2018

Water

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The efforts to improve the stability of membrane filtration in applications for wastewater treatment or the purification of drinking water still dominate the research in the field of membrane technology. Various factors that cause membrane fouling have been explored to find the solution for improving the stability of the filtration and prolong membrane lifetime. The present work explains the filtration performance of a hollow fiber membrane that is fabricated from polyethersulfone-2-(methacryloyloxy) ethyl phosphorylchloline while using a sodium alginate (SA) feed solution. The filtration process is designed in a pressure driven cross-flow module using a single piece hollow fiber membrane in a flow of outside-inside We investigate the effect of Ca and Mg ions in SA solution on the relative permeability, membrane resistance, cake resistance, and cake formation on the membrane surface. Furthermore, the performance of membrane filtration is predicted while using mathematical models that were developed based on Darcy’s law. Results show that the presence of Ca ions in SA solution has the most prominent effect on the formation of a cake layer. The formed cake layer has a significant effect in lowering relative permeability. The developed models have a good fit with the experimental data for pure water filtration with R2 values between 0.9200 and 0.9999. When treating SA solutions, the developed models fit well with experimental with the best model (Model I) shows R2 of 0.9998, 0.9999, and 0.9994 for SA, SA + Ca, and SA + Mg feeds, respectively.

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“…The results of the SEM characterization are shown in In this study, the profile of water permeability is predicted while using the mathematical models, as in Equations (29) and (30).…”

Section: Membrane Characteristicmentioning

confidence: 99%

Section: Filtration Of Sodium Alginate Solutionmentioning

confidence: 99%

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The Effect of Ca and Mg Ions on the Filtration Profile of Sodium Alginate Solution in a Polyethersulfone-2-(methacryloyloxy) Ethyl Phosphorylchloline Membrane

Arahman

Satria

Razi

et al. 2018

Water

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“…In the presence of 0.5 mmol/L calcium ions, the mass of the deposited PAC was dramatically increased by HA (3.33 g/m 2 , p = 7.71E-5 < 0.05) and SA (2.65 g/m 2 , p = 1.02E-4 < 0.05). The results could be due to the following reasons: (1) calcium ions prompted the adsorption of HA and SA on the PAC and membrane surface [10,30]; (2) the mass of the deposited HA and SA increased in the presence of calcium ions [28,31]; (3) the characteristics of the deposited HA and SA changed in the presence of calcium ions. Calcium ions have a strong affinity with the carboxylic moieties of HA, and is able to bridge HA molecules together [23].…”

Section: Deposition Of Pac On the Membrane In The Presence Of Differementioning

confidence: 99%

“…Similar to HA, SA can also form complexes with calcium ions, and resulting in an "egg-box" structure [35]. When the calcium-free water was used during the physical cleaning, the calcium ions were released from the cake layer, thus destroying the "cross-linked" structure or the "egg-box" structure [28,31]. As a result, the HA and SA in the cake layer could be removed by physical cleaning using calcium-free water, and thus the PAC could be readily detached.…”

Section: Chemical Compounds Of Physical Cleaning Watermentioning

confidence: 99%

Deposition of powdered activated carbon (PAC) on ultrafiltration (UF) membrane surface: influencing factors and mechanisms

Shao

Cai

et al. 2017

Journal of Membrane Science

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The deposition of powdered activated carbon (PAC) on an ultrafiltration (UF) membrane surface, a common phenomenon in the PAC/UF hybrid process, may have a pronounced influence on UF operation. In this study, the influencing factors and mechanisms of the deposition of PAC were systematically investigated. The influencing factors included the organic species, membrane material, PAC size, filtration volume, and cleaning water. The experimental results suggested that PAC itself was rarely deposited on the membrane surface, forming a monolayer. However, in the cases when organic matter was heavily deposited on the membrane surface (e.g., humic acid (HA) and sodium alginate (SA) in the presence of 0.5 mmol/L calcium ions), multilayers of PAC and the organic matter formed; thus, the mass of the deposited PAC significantly increased. The deposition of PAC was barely affected by the membrane material, and decreased as the PAC size increased. Physical cleaning with pure water could effectively detach the deposited PAC. The HA adsorbed by the PAC and the membrane hindered the deposition of PAC because this part of the HA decreased the attractive force between the PAC and the membrane. However, the HA rejected by the membrane promoted the deposition of PAC, as evidenced by the fact that the mass of the deposited PAC increased as the mass of the deposited HA increased. The PAC could be "trapped" in the layer of HA when it formed a cake layer with the HA rejected by the membrane.

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Polyethyleneimine‐grafted membranes for simultaneously adsorbing heavy metal ions and rejecting suspended particles in wastewater

Ruan

Liao

et al. 2017

AIChE Journal

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Heavy metal ions (HMIs) in wastewater can be removed by polyethyleneimine (PEI) adsorption, however, it is difficult to recycle PEI macromolecules from their mixture with suspended particles in wastewater. A novel HMIs adsorption technique with renewable PEI‐grafted porous membranes was developed. PEI molecules were dispersed with high specific area and structured morphology, which allowed HMIs and suspended particles to be retained separately at different locations of the membrane, with the former adsorbed in matrix and the latter rejected on surface. The membranes with the optimized PEI loading ratio of 30 k wt % behaved excellently with microsphere rejection and Co(II) adsorption reaching 98.5% and 51.0 mg/g, respectively. They successfully decreased Co(II) concentration from 3.0 mg/L to the allowable discharge standard (0.5 mg/L), even with an enhanced flux of 6200 L/m2/h at 0.12 MPa under the cyclic tests. Overall, PEI‐grafted membrane adsorption is highly efficient for removing HMIs and suspended particles simultaneously from wastewater. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4541–4548, 2017

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Role of backwash water composition in alleviating ultrafiltration membrane fouling by sodium alginate and the effectiveness of salt backwashing

Cited by 70 publications

References 42 publications

The Effect of Ca and Mg Ions on the Filtration Profile of Sodium Alginate Solution in a Polyethersulfone-2-(methacryloyloxy) Ethyl Phosphorylchloline Membrane

The Effect of Ca and Mg Ions on the Filtration Profile of Sodium Alginate Solution in a Polyethersulfone-2-(methacryloyloxy) Ethyl Phosphorylchloline Membrane

Deposition of powdered activated carbon (PAC) on ultrafiltration (UF) membrane surface: influencing factors and mechanisms

Polyethyleneimine‐grafted membranes for simultaneously adsorbing heavy metal ions and rejecting suspended particles in wastewater

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