Decomposition of gas phase 1,3-butadiene by ultraviolet/ozone process.
A pilot-scale plug-flow reactor was built to investigate its performance in treating airborne 1,3-butadiene (BD) via ozonation (O3) and ultraviolet (UV)/O3 technologies. Governing factors, such as the initial molar ratio of ozone to BD, UV volumetric electric input power, and moisture content in the influent airstream, were investigated. Experiments were conducted at an influent BD concentration of approximately 50 ppm, an ambient temperature of 26 degrees C, and a gas retention time of 85 sec. Results show that an initial molar ratio of ozone to BD of 3.5 and 2 sufficed to obtain BD decompositions of >90% for ozonation and UV/O3, respectively. The UV irradiance did not directly promote the decomposition of BD, rather, it played a role in promoting the production of secondary oxidants, such as hydroxyl radicals. Kinetic analyses indicate that both types of BD decomposition are peudo-first-order with respect to BD concentrations. Moisture content (relative humidity = 40-99%) and UV volumetric electric input power (0.147 and 0.294 W/L) are both factors that weakly affect the rate of BD decomposition. Economic evaluation factors, including both energy of ozone production and UV electric input power, were also estimated.
Chou
Ming-Shean
MS
Institute of Environmental Engineering, National Sun Yat-Sen University, Taiwan, Republic of China. ms.chou@msa.hinet.net
Huang
Bo-Jen
BJ
Chang
Hsiao-Yu
HY
D000397:Air Pollution / Q000517:prevention & control*; D002070:Butadienes / Q000032:analysis* / Q000737:chemistry; D002273:Carcinogens / Q000032:analysis* / Q000737:chemistry; D010083:Oxidants, Photochemical / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D014466:Ultraviolet Rays
D002070:Butadienes; D002273:Carcinogens; D010083:Oxidants, Photochemical; D010126:Ozone; C031763:1,3-butadiene