Modeling perchloroethylene degradation under ultrasonic irradiation and photochemical oxidation in aqueous solution

Journal of Environmental Health Science Engineering

Bagher Pahlevanzadeh⁵  Shahrokh Nazmara⁴  Mahmood Alimohammadi⁴  Amir Hossein Mahvi³  Alireza Mesdaghinia⁴  Simin Nasseri¹  Kazem Naddafi²  Ramin Nabizadeh⁴  Mahdi Kargar⁴ 

[1] Center for Water Quality Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran;Center for Air Pollution Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran;Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran;Department of Environmental Health Engineering, School of public Health, Tehran University of Medical Sciences, Tehran, Iran;Department of Epidemiology and Biostatistics, School of public Health, Tehran University of Medical Sciences, Tehran, Iran

关键词: Kinetics models;    Photochemical oxidation;    Ultrasound;    Perchloroethylene;   

Others  :  821353
DOI  :  10.1186/1735-2746-9-32

 received in 2012-07-31, accepted in 2012-12-22,  发布年份 2012

【 摘 要 】

Sonolysis and photochemical degradation of different compounds such as chlorinated aliphatic hydrocarbons are among the recent advanced oxidation processes. Perchloroethylene is one of these compounds that has been mainly used as a solvent and degreaser. In this work, elimination of perchloroethylene in aqueous solution by ultrasonic irradiation, andphotochemical oxidation by ultra violet ray and hydrogen peroxide were investigated. Three different initial concentrations of perchloroethylene at different pH values, detention periods, and concentrations of hydrogen peroxide were investigated. Head space gas chromatography with FID detector was used for analyses of perchloroethylene. This research was performed in 9 months from April through December 2011.

Results showed that perchloroethylene could be effectively and rapidly degraded by ultrasonic irradiation, photochemical oxidation by ultra violet ray, hydrogen peroxide and a combination of these methods. Kinetics of perchloroethylene was strongly influenced by time, initial concentration and pH value. Degradation of Perchloroethylene increased with decrease in the initial concentration of perchloroethylene from 0.3 to 10 mg/L at all initial pH. The results showed an optimum degradation condition achieved at pH = 5 but did not affect significantly the perchloroethylene destruction in the various pH values. Kinetic modeling applied for the obtained results showed that the degradation of perchloroethylene by ultrasound and photo-oxidation followed first order and second order model. The percentage of removal in the hybrids reactor was higher than each of the reactors alone, the reason being the role of hydroxyl radical induced by ultrasound and photochemical reaction.

【 授权许可】

   
2012 Kargar et al.; licensee BioMed Central Ltd.

【 图 表 】

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