Ceramic membrane fouling during ultrafiltration of oil/water emulsions: roles played by stabilization surfactants of oil droplets

Environmental Science & Technology
Dongwei LuJun Ma

Abstract

Oil/water (O/W) emulsion stabilized by surfactants is the part of oily wastewater that is most difficult to handle. Ceramic membrane ultrafiltration presently is an ideal process to treat O/W emulsions. However, little is known about the fouling mechanism of the ceramic membrane during O/W emulsion treatment. This paper investigated how stabilization surfactants of O/W emulsions influence the irreversible fouling of ceramic membranes during ultrafiltration. An unexpected phenomenon observed was that irreversible fouling was much less when the charge of the stabilization surfactant of O/W emulsions is opposite to the membrane. The less ceramic membrane fouling in this case was proposed to be due to a synergetic steric effect and demulsification effect which prevented the penetration of oil droplets into membrane pores and led to less pore blockage. This proposed mechanism was supported by cross section images of fouled and virgin ceramic membranes taken with scanning electron microscopy, regression results of classical fouling models, and analysis of organic components rejected by the membrane. Furthermore, this mechanism was also verified by the existence of a steric effect and demulsification effect. Our finding suggests that ...Continue Reading

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Citations

Sep 24, 2016·Environmental Pollution·Lorenzo RossiXingmao Ma
Sep 9, 2019·Environmental Science and Pollution Research International·Lixiu ShiXue Li
May 7, 2021·Journal of Hazardous Materials·Şeyma KücükVolodymyr V Tarabara
May 23, 2021·Macromolecular Rapid Communications·Pabitra SahaAndrij Pich
May 14, 2020·Environmental Science & Technology·Mingming ZhangChuyang Y Tang

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