Ultralow-Resistance High-Voltage Loaded Woven Air Filter for Fine Particle/Bacteria Removal.

Area of Science:

• Materials Science
• Environmental Engineering
• Electrostatics

Background:

• Conventional air filters use dense nonwoven materials, leading to high energy use, poor performance, and disposal issues.
• There is a need for advanced filtration systems that are efficient, low-resistance, and environmentally friendly.

Purpose of the Study:

• To develop and evaluate a novel high-voltage-loaded woven structure filtration (VLWF) system.
• To assess the filtration performance, pressure drop, cleanability, and environmental impact of the VLWF system.

Main Methods:

• Fabricating ultraloose woven structures with a dopamine binding layer for Ag conductivity.
• Constructing the VLWF system with negative-ion, high-voltage, and grounded zones.
• Evaluating morphological, chemical, electrical, and filtration properties, including PM2.5 and E. coli removal.

Main Results:

• Achieved 67.4% PM2.5 and 97.0% E. coli filtration efficiency with a low pressure drop of 6.2 Pa.
• Maintained over 58.4% efficiency after three ultrasonic cleaning cycles without increased air resistance.
• Demonstrated a high quality factor of 0.1810 Pa⁻¹ with no ozone release.

Conclusions:

• The VLWF system effectively balances high filtration efficiency and low air resistance using an ultraloose woven structure and high-voltage assistance.
• This cleanable filter model significantly reduces pollution from disposable filters and offers cost savings.
• Filtration mechanisms may involve blocking, electrostatic attraction, induced repulsion, and biostructure inactivation.