Author/Authors :
Kargar، Mahdi نويسنده , , Nabizadeh، Ramin نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Naddafi، Kazam نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Nasseri، Simin نويسنده 1Department of Environmental Health Engineering, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran , , Mesdaghinia، Alireza نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2National Institute of Health Research, Ministry of Health, Tehran, Iran , , Mahvi، Amirhossein نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,2National Institute of Health Research, Ministry of Health, Tehran, Iran , , Alimohammadi، Mahmood نويسنده Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Nazmara، Shahrokh نويسنده 1Center for Environmental Research and Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran , , Pahlevanzadeh، Bagher نويسنده Department of Epidemiology and Biostatistics, School of public Health, Tehran University of Medical Sciences, Tehran, Iran ,
Abstract :
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.
