Research progress on the cleaning and regeneration of PM2.5 filter media--颗粒学报PARTICUOLOGY

Wu, S., Cai, R., & Zhang, L. (2021). Research progress on the cleaning and regeneration of PM2.5 filter media. Particuology, 57, 28-44. https://doi.org/10.1016/j.partic.2020.11.006

Research progress on the cleaning and regeneration of PM_2.5 filter media

Shunjie Wu ^a, Rongrong Cai ^a*, Lizhi Zhang ^{a b}

a Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
b State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

10.1016/j.partic.2020.11.006

Volume 57, August 2021, Pages 28-44

Received 30 September 2020, Revised 10 November 2020, Accepted 17 November 2020, Available online 13 January 2021, Version of Record 13 March 2021.

E-mail: cerrcai@scut.edu.cn

Highlights

• Principles and applicability of dry- and wet-cleaning techniques are analyzed.

• Wet-cleaning characteristics of several novel PM_2.5 filters are summarized and evaluated.

• Mechanical strength and chemical resistance key to cleaning and regeneration performance are discussed.

• Research challenges and development trends of cleanable filter media are discussed.

Abstract

Reusable PM_2.5 filter media and their regeneration techniques have attracted widespread attention and shown significant prospect for application in air purification. In this study, we reviewed the recent research progress on the cleaning and regeneration of indoor PM_2.5 filters considering two methods, namely, dry and wet cleaning. The principles, application status, and limitations of air back-blow and air pulse-jet dry-cleaning techniques were analyzed. The wet-cleaning characteristics and regeneration performance of novel washable PM_2.5 filters, including superhydrophobic, electrostatically enhanced, metal–organic framework composite, and microchannel monolith filters, were evaluated and summarized. Maintaining the structural stability and chemical resistance of the filter media during the cleaning process was determined to be key to filter regeneration. Therefore, cleaning and regeneration characteristics should be integrated into the design of high-efficiency and low-resistance filter materials to develop more practical reusable PM_2.5 filter media.

Graphical abstract

Keywords

Aerosol filtration; Reusable filter media; Cleaning technique; Regeneration

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