The critical pressure for microfiltration of oil-in-water emulsions using slotted-pore membranes

Darvishzadeh, Tohid; Bhattarai, Bishal; Priezjev, Nikolai V.

doi:10.1016/j.memsci.2018.06.020

Cited by 18 publications

(12 citation statements)

References 34 publications

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“…Darvishzadeh and Priezjec, conducted a computation Fluid dynamic (CFD) simulation study to validated the critical pressure in equation ( 7), fortunately, the simulation model in absence of crossflow predicted the matching values given by the critical pressure model in equation ( 7) [42]. However, the study also illustrated by the plot in figure 2.5 above, that under subcritical pressure conditions, the pressure increase is directly proportional to crossflow velocity up to a certain predetermined critical pressure value which results in oil droplet breakthrough [42]. Furthermore, the oil droplet deformation and permeation by critical pressure effect was reported to be a function of shear rate for the oil droplet radius ranging from (1.5 -2.5 μm) at constant membrane pore radius of 0.5μm [42].…”

Section: Model Interpretation and Discussionmentioning

confidence: 97%

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Membrane Backwash Performance Improvement-A Review

Mopeli¹,

Sob²,

Alugongo³

et al. 2022

IJETAE

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To date, different models and parameters have been used to design membrane backwash system for different applications and in most cases this has led to improved performance of membrane system. However, some of these developed backwashing system are inefficient, due to poor modelling of relevant physical parameters and variables that affect backwash system. An efficient cleaning design of a membrane backwash system has proven to be a promising approach or technique in improving membrane performance for different applications. As such, it is important to study all the relevant models and parameters that can be used in designing a membrane backwash system to improve the overall performance of the membrane system for oil-water separation application. In this review study, a series of models are identified and their potential application to establish critical operating process during backwash. This report has three section, namely: Identification of critical backwash operating conditions that could potentially optimize backwash system, flux recovery models and lastly, fouling-based models. The purpose of this review is to identify relevant parameters and relevant models during backwash process. More consideration is based on demonstrating the effectiveness of high intensity of critical operating condition during backwash, which canforce the oil droplet blockage to be dislodged out of the membrane pores with ease. As result, reduction in backwash duration and improve the overall performance. This study concludes as follows; the identification of critical parameter, majority of the models are based on conservation principle which is a (collective of conservation mass, momentum and energy) governed by Navier-Stokes laws. Also, modelling the oil droplet dislodging phenomenon, much consideration should be based on the driving back-pressure and interfacial tension forces, to deform and push the oil droplet blockage out of the pores. Furthermore, developed critical pressure models on filtration phase do not directly consider the different fouling formation between oil and solid particles.

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Section: Model Interpretation and Discussionmentioning

confidence: 97%

“…The critical pressure oil droplet deformation effect across an interface of two immiscible fluids was initially modelled by Young-Laplace equation [41]. According to the equation, the critical pressure is product of the interface tension and the mean curvature coefficient as follows [41,42]:…”

Section: Model (Ii)mentioning

confidence: 99%

Membrane Backwash Performance Improvement-A Review

Mopeli¹,

Sob²,

Alugongo³

et al. 2022

IJETAE

View full text Add to dashboard Cite

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“…Fouling for polymeric membranes [119] can be interpreted through interactions between compounds in the oily feed emulsion and membrane surface [89] and its pores as illustrated in Figure 2a,b for a typically suggested mechanism for testing membrane cell based on cell design dead-end or cross-flow and related to physicochemical properties. [120,121] Figure 2c illustrated permeate flux change during the treatment of OWW using a membrane. In the 1st part of the plot between t 0 and t 1 using pure water as the feed, J 0 depends on membrane pore size, porosity, and applied pressure for separation.…”

Section: Flux Decline By Fouling By Oil-water Emulsionmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

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“…A comprehensive list of various MF membranes utilized for oil-inwater emulsion separation is reported in many literatures [48][49][50][51][52][53][54][55][56][57]. Moreover, UF membranes utilized in this application are also actively researched and readers are recommend to infer for detail analysis of the respective membrane information such as, employed method to prepare the membrane, efficiency, fouling compromise, potential of oil/ water separation and others [44,45,[58][59][60][61][62][63][64][65]66].…”

Section: Ultrafiltration (Uf)mentioning

confidence: 99%

Review on Membranes for the Filtration of Aqueous Based Solution: Oil in Water Emulsion

Gebreslase¹,

Bousquet²,

Bouyer

2018

J Membr Sci Technol

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This review provides insight into the application of membrane technology in the filtration of aqueous solution generated from different industries. Due to the ever-evolving and demanding strict attention to rules and regulation for discharging of oily waste water, researchers have investigated membrane technology as a best and suitable method for separation of oil in oil-water emulsion. Membrane-based separation processes are becoming a novel material to treat oily wastewater due its facile operation process and effective in removal of oil from oil/water emulsion. This review summarizes or highlights the recent development of advanced membrane technology employed to separate oil in water emulsion using polymer and ceramic-based membranes and modified membranes via blending, coating, grafting and other techniques. Moreover, integrated membranes system to achieve high separation efficiency over single membrane process is also discussed. Perspective and conclusions concerning the future development of filtration membranes for treatment of oil in water mixture are also provided. A review of membrane technology for oil/water emulsion treatment could have a substantial contribution in developing novel membranes and modification of the existed membranes.

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The critical pressure for microfiltration of oil-in-water emulsions using slotted-pore membranes

Cited by 18 publications

References 34 publications

Membrane Backwash Performance Improvement-A Review

Membrane Backwash Performance Improvement-A Review

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Review on Membranes for the Filtration of Aqueous Based Solution: Oil in Water Emulsion

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