Preparation of PVDF-based ultrafiltration membranes and its wastewater separation properties of cutting fluid

LIU Yaowei; HUANG Kun; ZHANG Bojun; FU Weigui; DU Runhong; ZHAO Yiping

doi:10.11868/j.issn.1001-4381.2022.001079

Cailiao gongcheng (Feb 2024)

Preparation of PVDF-based ultrafiltration membranes and its wastewater separation properties of cutting fluid

LIU Yaowei,
HUANG Kun,
ZHANG Bojun,
FU Weigui,
DU Runhong,
ZHAO Yiping

Affiliations

LIU Yaowei: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
HUANG Kun: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
ZHANG Bojun: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
FU Weigui: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
DU Runhong: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
ZHAO Yiping: State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2022.001079
Journal volume & issue: Vol. 52, no. 2
pp. 227 – 234

Abstract

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Cutting fluid wastewater contains a large amount of emulsified oil. If it is discharged directly without treatment, it will cause environmental pollution and water ecosystem destruction. In order to efficiently separate oil-in-water emulsion wastewater and reduce membrane fouling, polyvinylidene fluoride (PVDF) hollow fiber membrane with good membrane-forming property, stable mechanical properties and good chemical resistance was used as the support, the amino group of cysteamine was introduced to the membrane surface, and then amidated with the carboxyl group of methacrylic acid, and followed by forming a cyclic polymer functional layer through a free radical polymerization reaction, thus PVDF-based composite membrane with good hydrophilicity, large flux and high oil-water separation rate was obtained. The physical and chemical properties of the modified films were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM) and water contact angle. The separation effect of n-hexane-in-water emulsion and cutting fluid wastewater was tested by self-made cross-flow filtration device. The results show that the water contact angle (WCA) of the original membrane (M0) is 91.95°, while the WCA of the modified membrane M1, M2 and M3 decrease to 65.78°, 51.08° and 71.70°, respectively, indicating that the hydrophilicity of the modified membrane is improved. The permeation fluxes of M0, M1, M2 and M3 for n-hexane-in-water emulsion are 37.34, 58.40, 81.57, 44.55 L·m-2·h-1, respectively. The water fluxes for cutting fluid and wastewater separation are 7.41, 11.96, 24.36, 10.80 L·m-2·h-1, respectively. The fluxes of the original membrane and the modified membrane in separating high concentration cutting fluid wastewater decrease, but the permeation flux of the modified membrane is obviously higher than that of the original membrane, and the permeation flux of M2 modified membrane is the best, which indicates that the modified membrane has the best hydrophilicity and anti-pollution ability, and is expected to be used in the treatment of industrial oily wastewater.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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