Application of Colloidal Filtration Theory on Textile Fibrous Media: Effect of Fiber Orientation on Bacterial Removal Efficiency and Attachment

Roy, Sukumar; Ghosh, Shalini; Bhowmick, Niranjan

doi:10.1007/s40034-018-0120-9

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…Th ey claimed that the higher positive charge of the media at an acidic pH will result in higher metal removal effi ciency. In the desalination process based on textile nanofi bers membranes, most membranes are characterised by a negative surface Figure 4: Eff ect of fi bre orientation on single collector contact effi ciency and approach velocity [42] To quantitatively compare removal effi ciency with diff erent fi bre orientations under identical solution conditions, the value of collision (attachment) efficiency (α) is calculated using equation no. 12, which is used in colloidal fi ltration theory.…”

Section: Fibre Surface Chargementioning

confidence: 99%

“…Roy et al [42] investigated the attachment of bacteria to fibrous material as a function of fibre orientation to the direction of the liquid flow. Removal trends were explained on the basis of colloidal filtration theory.…”

Section: Eff Ect Of Fi Bre Orientation On Bacteria Fi Ltrationmentioning

confidence: 99%

“…Removal trends were explained on the basis of colloidal filtration theory. They reported that by changing fibre orientation from 0° to 90°, bacteria removal efficiency increased from 30% to 54.54%, suggesting that the attachment of bacteria on the media surface depends on fibre orientation ( Figure 3) Figure 3: Removal effi ciency as a function of the fi bre orientation angle [42] It is evident from Figure 4 that single collector efficiency increases from 1.33×10 -2 to 1.39×10 -2 by changing fi bre orientation from 0° to 90°. Th is is due to a decrement in the approach velocity of the fi ltration system from 3.09×10 -3 to 2.01×10 -3 m/s.…”

Section: Eff Ect Of Fi Bre Orientation On Bacteria Fi Ltrationmentioning

confidence: 99%

“…Collision effi ciency as a function of the orientation angle[42] Removal effi ciency as a function of media mass[43] Collision effi ciency as a function of media mass[43] Tekstilec, 2019, 62(2), 101-109Mechanism of Colloidal Attachment on Textile Fibrous Media…”

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confidence: 99%

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Mechanism of Colloidal Attachment on Textile Fibrous Media

Roy¹,

Ghosh²,

Bhowmick³

2019

TEK

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Colloids are fi nely divided particles distributed in a dispersion medium. Th e diameter of particles ranges from around 10 nm to 10μm [1]. Many of these colloids (viruses, bacteria and protozoan parasites) in surface water pose a risk to public health [2]. Numerous processes are available for the removal of these colloids, which is achieved using an attachment mechanism. Filtration through porous media

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Section: Fibre Surface Chargementioning

confidence: 99%

Section: Eff Ect Of Fi Bre Orientation On Bacteria Fi Ltrationmentioning

confidence: 99%

Section: Eff Ect Of Fi Bre Orientation On Bacteria Fi Ltrationmentioning

confidence: 99%

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confidence: 99%

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Mechanism of Colloidal Attachment on Textile Fibrous Media

Roy¹,

Ghosh²,

Bhowmick³

2019

TEK

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“…Most reports on the filtration of bacteria with textile materials are based on the use of a fabric as a substrate. In the only available study using textile fibres, the authors showed the importance of PA fibres’ orientation on such a filter performance due to the change in the contact and collision (attachment) efficiency of the fibres [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Cationised Fibre-Based Cellulose Multi-Layer Membranes for Sterile and High-Flow Bacteria Retention and Inactivation

et al. 2023

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Low-cost, readily available, or even disposable membranes in water purification or downstream biopharma processes are becoming attractive alternatives to expensive polymeric columns or filters. In this article, the potential of microfiltration membranes prepared from differently orientated viscose fibre slivers, infused with ultrafine quaternised (qCNF) and amino-hydrophobised (aCNF) cellulose nanofibrils, were investigated for capturing and deactivating the bacteria from water during vacuum filtration. The morphology and capturing mechanism of the single- and multi-layer structured membranes were evaluated using microscopic imaging and colloidal particles. They were assessed for antibacterial efficacy and the retention of selected bacterial species (Escherichia coli, Staphylococcus aureus, Micrococcus luteus), differing in the cell envelope structure, hydrodynamic biovolume (shape and size) and their clustering. The aCNF increased biocidal efficacy significantly when compared to qCNF-integrated membrane, although the latter retained bacteria equally effectively by a thicker multi-layer structured membrane. The retention of bacterial cells occurred through electrostatic and hydrophobic interactions, as well as via interfibrous pore diffusion, depending on their physicochemical properties. For all bacterial strains, the highest retention (up to 100% or log 6 reduction) at >50 L/h∗bar∗m2 flow rate was achieved with a 4-layer gradient-structured membrane containing different aCNF content, thereby matching the performance of industrial polymeric filters used for removing bacteria.

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