Removal of Indoor Air Contaminant by Atmospheric Microplasma

Microplasma has advantages of reducing the power and downsizing the entire plasma system. Decomposition of formaldehyde (HCHO) by a microplasma reactor was demonstrated for improving Indoor air Quality (IAQ). One experimental investigation was one pass treatment (5 L/min) and the other one way with a large volume treatment (500 L/min). Removal ratio of HCHO (initial concentration: 0.8 ppm) in one pass treatment was 96 % at a discharge voltage of 1.3 kV using a high voltage amplifier and a Marx Generator with MOSFET switches as pulsed power supplies. In the case of using the Marx Generator there was any NOx generation. Removal ratio of HCHO (initial concentration: 0.5 ppm) in large volume treatment after 60 minutes was 51% at 1.2 kV when using HV amplifier and considering 41 % natural decay ratio of HCHO. Removal ratio was 54 % at 1.2 kV with Marx Generator and 44% natural decay ratio after 60 minutes of treatment.