Treatment of exhaust gas from spray paint process with plasma-photocatalytic method

Plasma-photocatalytic technique was applied to decompose the volatile organic compounds (VOCs) from the painting process of the wooden doors manufacturing. The synergetic effect of the plasma-catalysis and its industrial feasibility were investigated, moreover, the operating conditions and the combination of exhaust gas treating process were optimized. A plasma-catalytic configuration capable of dealing with VOCs exhaust at a rate of 5 000 m³/h was developed on the basis of laboratory test and industrial pilot. The degradation ratio of total VOCs and xylene can go beyond 70% and 60%, respectively. The results also showed that the operating cost of the process is in a relatively low range. Thus, with this method, a high degradation rate that meets the national emission standards can be achieved at a relatively low cost. This process provides a new highly effective alternative to the conventional methods for the removal of VOCs from the painting process of the wooden doors manufacturing.