Aerosol filtration using hollow-fiber membranes: Effect of permeate velocity and dust amount on separation of submicron TiO2 particles

Bulejko, Pavel; Svěrák, Tomáš; Dohnal, Mirko; Pospíšil, Jiří

doi:10.1016/j.powtec.2018.09.040

Cited by 11 publications

(6 citation statements)

References 54 publications

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“…There are two main methods to prepare hollow structured fibers by coaxial electrospinning: a) Selective dissolution; b) Thermal decomposition . Until now, a variety of hollow nanofibers with polymer matrix have been fabricated by electrospinning technology, such as poly(ether sulfone), polyvinylidene fluoride (PVDF), polypropylene (PP), polytetrafluoroethylene (PTFE), poly(ether imide) (PEI) . Compared with the core–shell structure, hollow structure fiber is more suitable for air filtration because of its higher porosity and lower weight, which greatly improves the filtration efficiency of ultrafine particles.…”

Section: Membranes Composed Of Multistructured Electrospun Nanofibersmentioning

confidence: 99%

Multistructured Electrospun Nanofibers for Air Filtration: A Review

Lü

Cui

et al. 2021

ACS Appl. Mater. Interfaces

287

178

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Air filtration materials (AFMs) have gradually become a research hotspot on account of the increasing attention paid to the global air quality problem. However, most AFMs cannot balance the contradiction between high filtration efficiency and low pressure drop. Electrospinning nanofibers have a large surface area to volume ratio, an adjustable porous structure, and a simple preparation process that make them an appropriate candidate for filtration materials. Therefore, electrospun nanofibers have attracted increased attention in air filtration applications. In this paper, first, the preparation methods of high-performance electrospun air filtration membranes (EAFMs) and the typical surface structures and filtration principles of electrospun fibers for air filtration are reviewed. Second, the research progress of EAFMs with multistructures, including nanoprotrusion, wrinkled, porous, branched, hollow, core–shell, ribbon, beaded, nets structure, and the application of these nanofibers in air filtration are summarized. Finally, challenges with the fabrication of EAFMs, limitations of their use, and trends for future developments are presented.

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Section: Membranes Composed Of Multistructured Electrospun Nanofibersmentioning

confidence: 99%

Multistructured Electrospun Nanofibers for Air Filtration: A Review

Lü

Cui

et al. 2021

ACS Appl. Mater. Interfaces

287

178

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“…Filtration experiments were done in a transparent chamber (1) connected to a fan (7) using a suction pipe (11), to which a hollow-fiber membrane bundle (2) was linked. Dust feeding was done via an opening (3) in the wall of the chamber using a pressure air nozzle (3 in red frame in Figure 2 ) as described elsewhere [ 10 ]. The suction pipe (11) was provided with an EE660 air velocity probe (E+E Elektronik Ges.m.b.H., Engerwitzdorf, Austria) (5) and an Omega PX277-05D5V differential pressure transducer (OMEGA Engineering Inc., Norwalk, CT, USA) (4) to measure pressure drop of the hollow-fiber membrane during dust loading.…”

Section: Methodsmentioning

confidence: 99%

“…However, despite the increasing amount of publications on the use of hollow-fiber membranes in air filtration, the particle loading behavior and especially dust-holding capacity, was practically not studied. Only two works were found to mention and measure dust-holding capacity [ 10 , 11 ]. However, this problem was addressed rather marginally.…”

Section: Introductionmentioning

confidence: 99%

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Bulejko

Krištof²,

Dohnal³

2021

Membranes

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In this work, we tried to analyze dust loading behavior of polypropylene hollow fiber membranes using average pressure drop models. Hollow fiber membranes varying in fiber diameter were loaded with a standardized test dust to simulate particle-polluted air. We measured pressure drop development of the membranes at different flowrates and dust concentrations, and, after each experiment, the dust deposited on the membrane fibers was weighed to obtain dust holding capacity (DHC). The obtained experimental data was analyzed using various average pressure drop models and compared with average pressure drop obtained from pressure drop/dust load dependence using a curve fit. Exponential and polynomial fitting was used and compared. Pressure drop in relation to the dust load followed different trends depending on the experimental conditions and inner fiber diameter. At higher flowrate, the dependence was polynomial no matter what the fiber diameter. However, with higher fiber diameter at lower permeate velocities, the dependence was close to exponential curve and followed similar trends as observed in planar filter media. Dust-holding capacity of the membranes depended on the experimental conditions and was up to 21.4 g. However, higher dust holding capacity was impossible to reach no matter the experiment duration due to self-cleaning ability of the tested membranes.

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“…The possibility of using renewable energy sources, such as waste heat, solar energy, or geothermal energy, may allow the integration of membrane distillation with other processes, making it more favorable energy-wise and therefore promising on an industrial scale [ 4 , 5 ]. Another possible use of the polymeric hollow fiber membrane is for aerosol or gas filtration [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Fully Polymeric Distillation Unit Based on Polypropylene Hollow Fibers

et al. 2021

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Access to pure water is a very topical issue today. Desalination represents a promising way of obtaining drinking water in areas of shortage. Currently, efforts are being made to replace the metal components of existing desalination units due to the high corrosivity of sea water. Another requirement is easy transportation and assembly. The presented solution combines two types of polymeric hollow fibers that are used to create the distillation unit. Porous polypropylene hollow fiber membranes have been used as an active surface for mass transfer in the distillation unit, while non-porous thermal polypropylene hollow fibers have been employed in the condenser. The large active area to volume ratio of the hollow fiber module improves the efficiency of both units. Hot water is pumped inside the membranes in the distillation unit. Evaporation is first observed at a temperature gradient of 10 °C. The water vapor flows through the tunnel to the condenser where cold water runs inside the fibers. The temperature gradient causes condensation of the vapor, and the condensate is collected. The article presents data for hot water at temperatures of 55, 60, and 65 °C. Optimization of the membrane module is evaluated and presented.

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Aerosol filtration using hollow-fiber membranes: Effect of permeate velocity and dust amount on separation of submicron TiO2 particles

Cited by 11 publications

References 54 publications

Multistructured Electrospun Nanofibers for Air Filtration: A Review

Multistructured Electrospun Nanofibers for Air Filtration: A Review

An Assessment on Average Pressure Drop and Dust-Holding Capacity of Hollow-Fiber Membranes in Air Filtration

Fully Polymeric Distillation Unit Based on Polypropylene Hollow Fibers

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