Effect of aggregate characteristics under different coagulation mechanisms on microfiltration membrane fouling

Wang, Jin; Guan, Jing; Santiwong, S.R.; Waite, T. David

doi:10.1016/j.desal.2010.03.056

Cited by 30 publications

(10 citation statements)

References 28 publications

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“…Further fouling development is promoted or diminished depending on whether the foulant-foulant interactions are more attractive or more repulsive in character, respectively. The electrostatic blocking effect, first reported by Vincent et al [7] and later by Adamczyk et al [8], is an example of repulsive interactions, which are caused by double-layer electrostatic repulsion between particles. Once a particle is already adsorbed on the surface, repulsive particle-particle interactions prevent further deposition near a previously settled particle.…”

Section: Introductionmentioning

confidence: 97%

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Trzaskuś

Vos

Kemperman

et al. 2015

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 97%

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Trzaskuś

Vos

Kemperman

et al. 2015

Journal of Membrane Science

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“…Cake compression is important in EC/MF systems as well in the range 2-24 psig of transmembrane pressure and aluminum dosages of 2 -30 mg/L [16,38,39,79]. These data suggest that inelastic mechanisms such as floc breakage or cake collapse (at the extreme) dominate cake compression [72,80]. Figure 3 [68,79,85].…”

Section: Membrane Fouling Control By Electrochemical Pretreatmentmentioning

confidence: 98%

“…where α* and α 0 * denote the specific resistance at pressure ∆P and for an unstressed cake (∆P = 0) respectively [39,72,73]. It should be noted that the absolute water flux across the membrane increases with pressure according to Darcy's law and the resistance in series approach to modeling MF flux decline [74].…”

Section: Membrane Fouling Control By Electrochemical Pretreatmentmentioning

confidence: 99%

Aluminum electrocoagulation as pretreatment during microfiltration of surface water containing NOM: A review of fouling, NOM, DBP, and virus control

Chellam

Sari

2016

Journal of Hazardous Materials

118

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Electrocoagulation (EC) is the intentional corrosion of sacrificial anodes (typically aluminum or iron) by passing electricity to release metal-ion coagulant species and destabilize a wide range of suspended, dissolved, and macromolecular contaminants. It can be integrated ahead of microfiltration (MF) to effectively control turbidity, microorganisms, and disinfection by-products (DBPs) and simultaneously maintain a high MF specific flux. This manuscript summarizes the current knowledge on MF pretreatment by aluminum EC particularly focusing on mechanisms of (i) electrocoagulant dosing, (ii) (bio)colloid destabilization, (iii) fouling reductions, and (iv) enhanced removal of viruses, natural organic matter (NOM), and DBP precursors. Electrolysis efficiently removes hydrophobic NOM, viruses, and siliceous foulants. Aluminum effectively electrocoagulates viruses by physically encapsulating them in flocs, neutralizing their surface charge and reducing electrostatic repulsion, and increasing hydrophobic interactions between any sorbed NOM and free viruses. New results included herein demonstrate that EC achieves DBP control by removing NOM, reducing chlorine-reactivity of remaining NOM, and inducing a slight shift toward more brominated trihalomethanes and haloacetic acids. EC reduces MF fouling by forming large flocs that tend to deposit on the membrane surface, i.e. decrease pore penetration and forming more permeable cakes and by reducing foulant mass in case of significant floc-flotation.

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“…Other studies have indicated that the physico-chemistry and structure of the coagulated flocs, and thus the porosity of cake layer, were an important influence on filtration efficiency. [34][35][36][37] Precipitated amorphous metal hydroxide slowly transforms into a crystalline form as it ages. 38 During this process, large amounts of water in the freshly precipitated hydroxide are released, which induces lattice re-organization and the formation of microcrystals.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling

Liu

Zhang

et al. 2019

npj Clean Water

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Pre-coagulation could mitigate the membrane fouling, and thus we used different Al coagulants as a pre-treatment for ultrafiltration to explore their effects on the morphology of the membrane cake layer and fouling. Parallel bench-scale tests, using three different species of Al (AlCl 3 , PACl 15 , and PACl 25 ), with and without humic acid, were operated continuously for a long period to investigate the effects of floc aging (~13 days). Specifically, the presence of humic acid affects the cake layer by influencing the rate and extent of floc crystallization, as greater crystallization leads to greater fouling (bio-fouling was excluded in this study). The fouling rate (indicated by the trans-membrane pressure at constant flux) varied with Al species and was found to increase as follows: PACl 15 < PACl 25 < AlCl 3 . The presence of humic acid also intensify membrane flouling. The results showed that three species of Al induced different sizes of primary nanoparticles and fractal dimensions of flocs, and therefore produced cake layers with different thickness/ structure. Analysis of flocs with different ages indicated a crystallization process in the cake layer. Crystallization exacerbate membrane fouling by decreasing the porosity of the cake layer, and the situation became severe in the presence of humic acid.npj Clean Water (2019) 2:17 ; https://doi.

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Effect of aggregate characteristics under different coagulation mechanisms on microfiltration membrane fouling

Cited by 30 publications

References 28 publications

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Towards controlled fouling and rejection in dead-end microfiltration of nanoparticles – Role of electrostatic interactions

Aluminum electrocoagulation as pretreatment during microfiltration of surface water containing NOM: A review of fouling, NOM, DBP, and virus control

Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling

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