Technology neutralisation principles
The first step consists of a thermal reactor. Most bacteria and viruses that are pathogenic to humans can be killed within minutes by heating them to 74 ˚C (165ºF) or higher . In the case of our technology, a volume of air is instantaneously heated to a temperature of between 250 ˚C and 350 ˚C to neutralise pathogens.
The second step involves UV light. It is well known that UV light kills pathogens [ref]. This step is relatively simple. It involves flowing the outlet of the thermal zone step into a cell, a stainless-steel tube for example, which contains the UV light. As the gas circulates through this chamber, the UV light neutralises pathogens.
Plasma DBD sterilisation
The third step is the most aggressive one. It involves the use of a Plasma DBD (Dielectric Barrier Discharge) zone. DBD is known to kill pathogens. This reactor uses a unique licensed technology developed by ASDevices. Inside this plasma reactor: i. Ozone is generated from air oxygen, ii. OH hydroxy ions are generated, iii. various UV rays having higher energy levels are generated, i.e. shorter wavelengths than the previous UV stage, high velocity electrons bombardment, heavy ion collision, a very high-intensity electric field that deforms organic molecules and can even break them, depending on the intensity of the field. An AC signal is used to create an oscillating collisional process.
Additionally, a secondary emission by the live copper electrodes exposed to the flowing air inside the reactor results in an increase in the electron population.
The DBD step is part of the final step whereby an air DBD generates ozone (O3). Ozone gas has been proven to kill the SARS coronavirus and since the structure of the new 2019-nCoV coronavirus is almost identical to that of the SARS coronavirus, ozone will have the same effect. In our technology, the O3 generated by the DBD is accumulated into the buffer tank. The buffer tank is the reservoir that is used after the final purification stage to accumulate the purified air at an elevated pressure. The accumulated ozone in that reservoir reacts with pathogens and neutralises them. This final step is used to make sure all pathogens are killed.
Exhaled Breath Sterilisation
Healthcare workers can also be a source of contamination. Standard N95 masks do not filter exhaled air. Our technology addresses this problem by filtering the exhaust air using a second plasma reactor. The principle is the same as the first plasma reactor. However, in this case, the reaction is done at ambient pressure.
The purification system also integrates multiple miniature check valves. This is another key point of this design as it prevents air from flowing back into the device.