The effect of fibre morphology on packing phenomena and bed properties in coalescers Technical paper

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Milica Hadnađev Kostić
Dunja Sokolović
Srđan Sokolović
Thomas Laminger
Arpad Kiralj


In this study, fibre morphology of waste materials and its effect on packing phenomena and bed properties were investigated. Nine waste materials were used in bed coalescers. By scanning electron microscopy, it was determined that surfaces of all fibres were smooth, while cross-section differed from circular, rectangular to irregular. The fibres with circular cross-sections had diameters in the range of 12±0.8 to 40±4 µm, while the fibres of polypropylene bags and sponges appeared as strips with the widths of 452±11 and 1001±14 µm, respectively. It was also noticed that polyurethane fibres were connected forming a sponge-like structure, while polyethylene terephthalate fibres were interconnected at some points. In this work, experimental dependence of bed porosity on bed permeability was established for all investigated materials, which allows forming a fibre bed with desired permeability. The exception was the bed formed of fibres of polypropylene bags, which had the largest dimensions and yielded a different porosity-permeability dependence.


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Hadnađev Kostić, M., Sokolović, D., Sokolović, S. ., Laminger, T., & Kiralj, A. (2022). The effect of fibre morphology on packing phenomena and bed properties in coalescers: Technical paper. HEMIJSKA INDUSTRIJA (Chemical Industry), 76(4), 197–208.
Chemical Engineering - General

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[[1] Spielman LA. Separation of Finely Dispersed Liquid-Liquid Suspensions by Flow through Fibrous Media. Doctoral thesis, University of California, Berkeley, United States; 1968.

Spielman LA, Goren SL. Theory of Coalescence by Flow through Porous Media. Ind Eng Chem Fundam. 1972; 11 (1): 66-72.,

Spielman LA, Goren SL. Experiments in Coalescence by Flow through Fibrous Mats. Ind Eng Chem Fundam. 1972; 11 (1): 73-83.,

Amrei MM, Venkateshan DG, D’Souza N, Atulasimha J, Tafreshi HV. Novel Approach to Measuring the Droplet Detachment Force from Fibers. Langmuir. 2016; 32 (50): 13333-13339.

Bhattad P, Willson CS, Thompson KE. Effect of network structure on characterization and flow modeling using X-ray micro-tomography images of granular and fibrous porous media. Transp. Porous Media. 2011; 90 (2): 363-391.

Bradford SA, Torkzaban S. Colloid interaction energies for physically and chemically heterogeneous porous media. Langmuir. 2013; 29 (11): 3668-3676.

Dawar S, Chase GG. Correlations for transverse motion of liquid drops on fibers. Sep Purif Technol. 2010; 72 (3): 282-287.

Elimelech M, Chen JY, Kuznar ZA. Particle Deposition onto Solid Surfaces with Micropatterned Charge Heterogeneity: The “Hydrodynamic Bump” Effect. Langmuir. 2003; 19 (17): 6594-6597.

Sokolović D, Govedarica D, Šećerov-Sokolović RM. Review: Influence of fluid properties and solid surface energy on efficiency of bed coalescence. Chem Ind Chem Eng Q. 2018; 24 (3): 210-230.

Shou D, Fan J, Zhang H, Qian X, Ye L. Filtration Efficiency of Non-Uniform Fibrous Filters. Aerosol Sci Technol. 2015; 49 (10): 912-919.

Zhu P, Kong T, Tian Y, Tang X, Tian X, Wang L. Superwettability with antithetic states: Fluid repellency in immiscible liquids. Mater Horiz. 2018; 5 (6): 1156-1165. DOI: 10.1039/c8mh00964c

Herminghaus S. Roughness-induced non-wetting. Europhys Lett. 2000; 52 (2): 165-170.

Miwa M, Nakajima A, Fujishima A, Hashimoto K, Watanabe T. Effects of the surface roughness on sliding angles of water droplets on superhydrophobic surfaces. Langmuir 2000; 16 (13): 5754-5760.

Xia F, Jiang L. Bio-inspired, smart, multiscale interfacial materials. Adv Mater. 2008; 20 (15): 2842-2858.

Zhang P, Wang S, Wang S, Jiang L. Superwetting surfaces under different media: Effects of surface topography on wettability. Small. 2015; 11 (16): 1939-1946. https://doi: 10.1002/smll.201401869

Yohe ST, Freedman JD, Falde EJ, Colson YL, Grinstaff MW. A Mechanistic Study of Wetting Superhydrophobic Porous 3D Meshes. Adv Funct Mater. 2013; 23 (29): 3628-3637.

Viswanadam G, Chase GG. Contact angles of drops on curved superhydrophobic surfaces. J Colloid Interface Sci. 2012; 367: 472-477.

Davoudi M, Fang J, Chase GG. Barrel shaped droplet movement at junctions of perpendicular fibers with different orientations to the air flow direction. Sep Purif Technol. 2016; 162: 1-5.

Šecerov Sokolović RM, Vulić TJ, Sokolović SM, Marinković-Nedučin RP. Effect of fibrous bed permeability on steady-state coalescence. Ind. Eng. Chem. Res. 2003; 42 (13): 3098-3102.

Šećerov Sokolović R, Stanimirović O, Sokolović S. The influence of fibrous bed bulk density on the bed properties. Hem Ind. 2003; 57 (7-8): 335-340. (in Serbian)

Agarwal S, von Arnim V, Stegmaier T, Planck H, Agarwal A. Role of surface wettability and roughness in emulsion separation. Sep Purif Technol. 2013; 107: 19-25.

Agarwal S, von Arnim V, Stegmaier T, Planck H, Agarwal A. Effect of Fibrous Coalescer geometry and operating conditions on emulsion separation. Ind Eng Chem Res. 2013; 52 (36): 13164-13170.

Fahim M, Othman F. Coalescence of secondary dispersions in composite packed beds. J Dispersion Sci Technol. 1987; 8 (5-6): 507-523.

Das D, Ishtiaque SM, Das S. Influence of fibre cross-sectional shape on air permeability of nonwovens. Fiber Polym. 2015. 16 (1) 79-85.

Šećerov Sokolović RM, Govedarica DD, Sokolović DS. Selection of filter media for steady-state bed coalescers. Ind Eng Chem Res. 2014; 53 (6): 2484-2490.

Kiralj A, Vulić T, Sokolović D, Šećerov Sokolović R, Dugić P. Separation of oil drops from water using stainless steel fiber bed. Chem Ind Chem Eng Q. 2017; 23 (2): 269-277.

Govedarica DD, Šećerov-Sokolović RM, Kiralj AI, Govedarica OM, Sokolović DS, Hadnađev-Kostić MS. Separation of mineral oil droplets using polypropylene fibre bed coalescence, Hem ind. 2015; 69 (4): 339-346.

Srđan S. Sokolović, Arpad I. Kiralj, Dunja S. Sokolović, Aleksandar I. Jokić, Application of waste polypropylene bags as filter media in coalescers for oily water treatment, Hem. Ind. 2019; 73 (3) 147-154

Das, D., Ishtiaque, S.M., Das, S. Influence of fibre cross-sectional shape on air permeability of nonwovens. Fiber Polym. 2015. 16, 79-85.

Cerepi A., Burlot R., Galaup S., Barde J. –P., Loisy C., Humbert L., Effects of porous solid structures on the electrical behaviour: prediction key of transport properties in sedimentary reservoir rock, Stud. Surf. Sci. Cat., 2002 (144), 483-490.