Basic study on indoor air quality improvement by atmospheric plasma

Indoor air control of particulate matter (PM) consisted of house dust, bacteria and so on was carried out to improve indoor air quality (IAQ) using atmospheric pressure plasma [1]. Two types of corona electrodes were placed inside a reactor and energized in order to generate non thermal plasma: disc type electrode and needle type electrode. Plasma can also decompose harmful substances by various active species such as reactive radicals (N*, O*, OH*, etc), ions and strong electric field [2-4]. Particles collection rate depended on the discharge voltage, number of mesh filters, flow rate and reactor characteristics. The disc type electrode could collect dust, and its rate reached to 95%. The needle electrode could collect dust, and its rate was reached to 98%. Also formaldehyde removal was carried out to confirm the improving performance of non thermal plasma and reduced below the regulated value of 0.08 ppm.