Characteristics of dielectric barrier discharges driven ozonation of acetaldehyde in aqueous solution
ozone has been widely used for the treatment of organic wastewaters,howeve wastewater treatment processes using ozone still have a high operation cost and disadvantage of harmful by-product formations(such as formaldehyde and acetaldehyde).This study investigated the properties of the ozonafion of acetaldehyde in solution.Ozone was generated using dielectric barrier discharge plasmas from pure oxygen.Ozonation of acetaldehyde was camed out after passing ozone into the water of acetaldehyde.It was found acetaldehyde was oxidized to CO and CO2.The selectivity of CO2 was in range of 66％～80％.The ozonation reaction of acetaldehyde is a first-order reaction of ozone concentration and acetaldehyde concentration.The energy efficiency decreased with increasing energy density.The maximum energy efficiency was 7.5 mol-CH3CHO/kWh under condifions of O2 flow rate 100 mL/min,discharge voltage 3.5 kV,initial acetaldehyde concentration 0.62 g/L,and initial pH value 5.0.It was suggested that the recycle of unreacted ozone contributes to reducing the cost for waste water treatment using ozone.
acetaldehyde oxidation ozonation dielectric barrier discharge plasma
Bin LU Mengmeng WANG Liuming PAN Min JI
Aschool of Environmental Science and Engineering,Tianjin University,Tianjin City 300072,China
国际会议
西安
英文
463-469
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）