A critical review on thermodynamic mechanisms of membrane fouling in membrane-based water treatment process

Abstract

● Fundamentals of membrane fouling are comprehensively reviewed.

● Contribution of thermodynamics on revealing membrane fouling mechanism is summarized.

● Quantitative approaches toward thermodynamic fouling mechanisms are deeply analyzed.

● Inspirations of thermodynamics for membrane fouling mitigation are briefly discussed.

● Research prospects on thermodynamics and membrane fouling are forecasted.

Membrane technology is widely regarded as one of the most promising technologies for wastewater treatment and reclamation in the 21st century. However, membrane fouling significantly limits its applicability and productivity. In recent decades, research on the membrane fouling has been one of the hottest spots in the field of membrane technology. In particular, recent advances in thermodynamics have substantially widened people’s perspectives on the intrinsic mechanisms of membrane fouling. Formulation of fouling mitigation strategies and fabrication of anti-fouling membranes have both benefited substantially from those studies. In the present review, a summary of the recent results on the thermodynamic mechanisms associated with the critical adhesion and filtration processes during membrane fouling is provided. Firstly, the importance of thermodynamics in membrane fouling is comprehensively assessed. Secondly, the quantitative methods and general factors involved in thermodynamic fouling mechanisms are critically reviewed. Based on the aforementioned information, a brief discussion is presented on the potential applications of thermodynamic fouling mechanisms for membrane fouling control. Finally, prospects for further research on thermodynamic mechanisms underlying membrane fouling are presented. Overall, the present review offers comprehensive and in-depth information on the thermodynamic mechanisms associated with complex fouling behaviors, which will further facilitate research and development in membrane technology.

Graphical abstract

Keywords

Membrane fouling / Thermodynamic mechanism / XDLVO theory / Flory-Huggins theory / Fouling migration

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