'X-ray' device traps airborne pathogens to protect lungs

Researchers led by an Indian origin scientist have developed a new air-cleaning device that could protect human lungs from allergens, airborne viruses and ultra-fine particles in the air.
The device, known as the SXC ESP has been found to prevent respiratory and viral infections and inhalation-induced allergic reactions more efficiently than existing filter-based systems.
"Because many people in developed countries spend the majority of time indoors, properly maintaining indoor air quality is an absolute necessity to protect public health," Pratim Biswas, professor and head energy, environmental and chemical engineering at the Washington University said.
The new device incorporates soft X-ray irradiation as a component of the electrostatic precipitation process currently used to remove large particles from airflows.

By incorporating the soft X-ray enhanced electrostatic precipitation technology, the researchers were able to ensure very efficient charging of the particles over a broad range of sizes and their capture in the device.
They exposed mice with compromised immune systems to the downstream air stream passing through the unit that contacted infectious viruses, allergens, anthrax, smallpox and other particles in the air.

The sensitive mice survived, indicating that the SXC ESP was very effective in removing these biological agents from the air.
"Traditional air cleaners can trap viruses or other toxic particles in the filter, where they linger and grow. This device finds the virus or toxic particle or bioterror agent and inactivates it in one application," Biswas said.

Ultimately, this technology could be incorporated into stand-alone air cleaners or scaled for use in aircraft cabins, offices and residential HVAC systems. It also could be used to clean up a diesel engine or power plant exhaust.