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Singh CJ, Mukhopadhyay S, Rengasamy RS. Oil separation from oil in water emulsion by coalescence filtration using kapok fibre. Environ Technol 2023; 44:381-393. [PMID: 34420490 DOI: 10.1080/09593330.2021.1972168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 08/15/2021] [Indexed: 06/13/2023]
Abstract
In this study, the stable emulsion of engine oil in water of concentration 10% was prepared using a non-ionic surfactant. Kapok fibres were used as filter beds to separate oil from the oil-water emulsion. The surface morphology of fibres was investigated using Scanning Electron Microscope (SEM) analysis and chemical bond analysis of fibres done using Fourier transform infrared (FTIR). Kapok filter beds were prepared with three different bed heights 10, 20 and 30 mm each with four different porosities 0.90, 0.92, 0.95 and 0.98 for preparing the coalescence filter. The oil-water emulsion (influent) was pumped into the filtration column and the coalesced oil droplets, water, as well as un-coalesced oil droplets, especially the finer oil droplets, were collected as effluent. Oil separation efficiency was evaluated in terms of change in droplet size (D50) and oil concentration from influent to effluent. With increasing porosity and bed height, apart from porosity of 0.92, the separation efficiency increases. Increasing the bed heights at lower porosities does not improve the efficiency of the process. A combination of 0.98 porosity and a bed height of 30 mm provided the highest filtration performance in terms of oil separation efficiency and D50 droplet ratio. At 0.98 porosity, increasing the bed height from 10 mm to 30 mm resulted in a D50 droplet ratio of 0.25-0.14, representing a significant decrease in droplet size in the effluent and therefore an increase in oil separation efficiency from 91.3% to 99.63%.
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Affiliation(s)
- Chandra Jeet Singh
- Department of Textile and Fibre Engineering, Indian Institute of Technology, Delhi, India
| | - Samrat Mukhopadhyay
- Department of Textile and Fibre Engineering, Indian Institute of Technology, Delhi, India
| | - R S Rengasamy
- Department of Textile and Fibre Engineering, Indian Institute of Technology, Delhi, India
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Liu Z, Xu Z, Liu C, Zhao Y, Xia Q, Fang M, Min X, Huang Z, Liu Y, Wu X. Polydopamine Nanocluster Embedded Nanofibrous Membrane via Blow Spinning for Separation of Oil/Water Emulsions. Molecules 2021; 26:3258. [PMID: 34071526 PMCID: PMC8199142 DOI: 10.3390/molecules26113258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/21/2021] [Accepted: 05/25/2021] [Indexed: 11/17/2022] Open
Abstract
Developing a porous separation membrane that can efficiently separate oil-water emulsions still represents a challenge. In this study, nanofiber membranes with polydopamine clusters polymerized and embedded on the surface were successfully constructed using a solution blow-spinning process. The hierarchical surface structure enhanced the selective wettability, superhydrophilicity in air (≈0°), and underwater oleophobicity (≈160.2°) of the membrane. This membrane can effectively separate oil-water emulsions, achieving an excellent permeation flux (1552 Lm-2 h-1) and high separation efficiency (~99.86%) while operating only under the force of gravity. When the external driving pressure was increased to 20 kPa, the separation efficiency hardly changed (99.81%). However, the permeation flux significantly increased to 5894 Lm-2 h-1. These results show that the as-prepared polydopamine nanocluster-embedded nanofiber membrane has an excellent potential for oily wastewater treatment applications.
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Affiliation(s)
- Zhenglian Liu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Ziling Xu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Chaoqi Liu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Yajing Zhao
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Qingyin Xia
- School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
| | - Minghao Fang
- School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
| | - Xin Min
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Zhaohui Huang
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Yan’gai Liu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
| | - Xiaowen Wu
- Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; (Z.L.); (Z.X.); (C.L.); (Y.Z.); (Z.H.); (Y.L.); (X.W.)
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