The Korea Institute of Machinery & Materials (KIMM) announced on April 28 that it developed a wet air purification technique for indoor use that removes super-fine dust by means of micro carbon fiber discharge electrodes 5 to 10 micrometers in size.
The discharge electrodes ensure that discharging efficiency can be maintained even at a low voltage so that harmful substances such as ozone can be reduced to less than a few ppb. Also, the technique employs a water film-type collecting plate where a high-intensity electric field is formed so that dust can be removed without any filter.
The dust that is collected by the water film-type collecting plate, which is designed to allow water to flow down, becomes charged and is moved to the water tank below along with the water film. Thus, the collecting plate can be maintained. Accordingly, the plate allows natural humidification as well as air purification.
The technique is semi-permanent and economically advantageous since no filter is used as described above. In addition, repair and maintenance can be facilitated as only the water in the water tank needs to be replaced. It is free from secondary pollutants attributable to poor filter management, and is eco-friendly since it entails no filter wastes.
Moreover, it operates at a low voltage to cause no risk of ozone generation, while it is capable of saving energy with little pressure loss. When the technique is applied to an air cleaner, at least 95 percent of super-fine dust with a size of 0.3 micrometers can be removed, and the ozone generation can be kept at a level of 1 ppb to 2 ppb.