Study on formaldehyde degradation using strong ionization discharge

Effects of formaldehyde degradation using strong ionization discharge were studied. A majority of gas molecules in the air such as O2 and H2O were ionized and maken into OH ·of high concentration using strong ionization discharge method to carry out formaldehyde removal experiment without catalyst and absorbent. Some factors such as exerted voltage, initial concentration, fume flow, which affect the formaldehyde removal efficiency were studied. The orthogonal test design method was applied to optimize the process conditions and the GC-MS method was used to analyse the organic components in the fume. The results indicated that as the exerted voltage increased the degradation efficiency (η) increased. The fume flow played a most important role on the increasing of η. With the fume flow decreased, probabilities of collision and reaction between formaldehyde and active molecules increased. The influence to degradation efficiency decreased in the order: fume flow > voltage > density. Under the optimized conditions, the initial density, exerted voltage and fume flow were 200mg/m3, 3.2kV and 0.2m3/h, respectively, η reached 93.2%. During the process of formaldehyde degradation, there´s no other organic gas produced, and η could be higher than 90%.