Ultrasonically Aided Cross-flow Membrane Filtration for Latex Wastewater

Ahmad, Abdul Latif; Lah, Nuur Fahanis Che; Ismail, Suzylawati

doi:10.21315/jps2018.29.s1.8

Cited by 3 publications

(6 citation statements)

References 26 publications

(30 reference statements)

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“…In previous studies, the application of ultrasound has increased permeate flux between 25% and 90% (Ahmad et al, 2018;Lamminen, 2004). A wide range of ultrasonic frequency and power levels have been investigated and, in most cases, lower frequencies have been more effective (Chai et al, 1999;Naddeo et al, 2015).…”

Section: Introductionmentioning

confidence: 95%

“…Cavitation bubbles result from the acoustic cavitation phenomenon that describes the growth and collapse of pre-existing microbubbles under influence of an ultrasonic field (Qasim et al, 2018). The formation of cavitation bubbles occurs when the pressure amplitude exceeds the tensile strength of the liquid during the rarefactions of sound waves (Ahmad et al, 2018). Figure 3-2 summarises the growth and collapse of cavitation bubbles.…”

Section: Mechanismmentioning

confidence: 99%

“…As a consequence, the use of higher frequencies is not as efficient in detaching particles from the cake layer. The difference between these two cases (lower and higher frequencies) can be explained by the attenuation of sound which is correlated to US frequency as shown in Equation ( 4) (Ahmad et al, 2018).…”

Section: Ultrasonic Frequencymentioning

confidence: 99%

“…The effectiveness of ultrasonic-assisted fouling control has also been tested using different feed solutions (e.g., peptone and milk aqueous solution, latex paint wastewater, and municipal wastewater). It has been observed that its properties play a major role in the overall performance (Ahmad et al, 2018;Borea et al, 2018;Kobayashi et al, 2003a).…”

Section: Introductionmentioning

confidence: 99%

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In-situ ultrasound-assisted control of polymeric membrane fouling

2020

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Section: Introductionmentioning

confidence: 95%

Section: Mechanismmentioning

confidence: 99%

Section: Ultrasonic Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In-situ ultrasound-assisted control of polymeric membrane fouling

2020

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“…While the difficulty of microfluidic solid‐liquid separations has been noted, there are numerous applications in this environment that could benefit from cross‐flow filtration . It has been successfully used for bacterial and yeast cell harvesting, as plasmapheresis for separating plasma from whole blood, for isolating macroscopic quantities of blood components for therapeutic purposes, and for nonbiological applications such as waste water recycling and latex separation . All of these lead to a filter cake comparable in size to the dimensions of the feed channel.…”

Section: Introductionmentioning

confidence: 99%

Modeling of fouling in cross‐flow microfiltration of suspensions

et al. 2018

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Cross-flow filtration of fine suspensions through microsieves occurs in microprocessing. The interaction of particles with surfaces in microenvironments has been extensively studied, but predominantly in monolayers and not with an eye to microfiltration. Here, we introduce a microfiltration model that pertains to particles that might be seen as fine in a macroscopic environment, but are large enough to intrude significantly into the shear layer of a microchannel. Thus, particle accumulation upon the sieve couples the steady-state filtrate flux and the suspension flow through the microchannel that feeds the sieve. We envision and create a stable, stationary multilayer of particles whose thickness is shear-limited and we identify and verify the structure and parameters that limit steady filtration in this environment. At first, a packed bed of particles forms, growing into and regulated by the micro channel's shear flow. A critical shear stress is shown to determine the thickness of the bed, seen as a stationary and stable multilayer of particles through which filtration may occur. As the bed thickens, at the expense of channel area for suspension flow, surface shear stress increases until no further particle adherence is possible. We built a simple example using hard noninteracting polymer microspheres and conducted cross-flow filtration experiments over Aquamarijn™ microsieves (uniform pore size of 0.8 μm). We observed a steady cake-layer thickness and because of the simple geometry afforded by uniform spheres, we could approximate the force balance, cake resistance, and filtration rate from first principles. The good fit of our data to the proposed mechanism lays a firm basis for the semiquantitative analysis of the behavior of more complex suspensions.Critical shear stress at each filtration rate (Q f ) was plotted to demonstrate a monotonically increasing trend, aligned with our theoretical prediction.

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In-Situ Ultrasound-Assisted Control of Polymeric Membrane Fouling

Heloisa¹

2021

Preprint

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Membrane separation processes have been more widely applied to industrial activities, especially in water and wastewater treatment. However, there are still challenges associated to the use of membranes. Concentration polarization and fouling can cause significant permeate flux decay during the filtration process, hindering its efficiency and increasing cost. Among many strategies, the combination of membrane filtration with ultrasound (US) application has shown promising results in reducing membrane fouling. The main goal of this research was to identify the effect of US frequency, US power intensity and feed solution concentration on permeate flux during ultrafiltration of simulated latex paint effluent. Maximum increase in permeate flux of 19.7% was obtained by applying 20 kHz and 0.29 W.cm-2 to feed solution with 0.075 wt.% of solid concentration. The effect of feed flow rate was analyzed showing that an increase in feed flowrate is not beneficial to the fouling minimization process. Overall, the application of US improves permeate flux by reducing fouling of ultrafiltration polymeric membrane.

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Ultrasonically Aided Cross-flow Membrane Filtration for Latex Wastewater

Abstract: An ultrasonically-aided membrane filtration system that offers clean

Cited by 3 publications

References 26 publications

In-situ ultrasound-assisted control of polymeric membrane fouling

In-situ ultrasound-assisted control of polymeric membrane fouling

Modeling of fouling in cross‐flow microfiltration of suspensions

In-Situ Ultrasound-Assisted Control of Polymeric Membrane Fouling

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