Performance factors for filtration of air using cellulosic fiber-based media: A review

Abstract

The filtration of air has attracted increasing attention during recent waves of viral infection. This review considers published literature regarding the usage of cellulose-based materials in air filtration devices, including face masks. Theoretical aspects are reviewed, leading to models that can be used to predict the relationship between structural features of air filter media and the collection efficiency for different particle size classes of airborne particulates. Collection of particles can be understood in terms of an interception mechanism, which is especially important for particles smaller than about 300 nm, and a set of deterministic mechanisms, which become important for larger particles. The effective usage of cellulosic material in air filtration requires the application of technologies including pulp refining and chemical treatments with such additives as wet-strength agents and hydrophobic sizing agents. By utilization of high levels of refining, in combination with freeze drying and related approaches, there are opportunities to achieve high levels of interception of fine particles. A bulky layer incorporating nanofibrillated cellulose can be used in combination with a coarser ply to achieve needed strength in a filter medium. Results of recent research show a wide range of development opportunities for diverse air filter devices containing cellulose.

Experimental study of materials for the filtration of the intake air of the internal combustion engine of a motor vehicle

“…Cellulose-based fiber filter media are widely used in the air filtration systems of modern vehicle and machine drive engines and for indoor air filtration [25,35]. Cellulose filter media, whose structure is formed by fibers with diameters of 10-20 µm, are characterized by high durability compared to some other filter materials.…”

Digital Twin Based on Historical Data and Simulation Results: Fault Detection and Estimation of the Remaining Useful Life of a Cyclone Bag Filter

“…Furthermore, it allows estimating an expected range of values for the measured data, making it possible to generate immediate alarms if the deviation from the estimates is higher than a limit value. Thanks to continuous data acquisition, it is possible to monitor the trends in the measured values, correlating them to the possible failures potentially affecting the plant [2,55,56]. In particular, the filter condition is estimated based on the difference in the values measured at consecutive measurement periods (see Table 8).…”

Hybrid Cellulose‐Based Systems for Triboelectrification in Aerosol Filtration, Ammonia Abatement and Respiration Monitoring

“…[7] Importantly, masks designed for mechanical filtration (inertial collision, interception, sieving, and diffusion) should be replaced every 2-4 h given their diminished efficacy to filter particulate matter (PM) and volatile organic compounds (VOCs). [8][9][10] Meanwhile, conventional PPE utilized to monitor the status of the user is compromised by a poor portability, low specificity, lack of real-time detection, and often require external power. [11][12][13][14][15] Therefore, developing portable and self-driven PPE with high filtration efficiency and respiration monitoring capabilities is an area of active research.…”