Kargar M, Nabizadeh R, Naddafi K, Nasseri S, Mesdaghinia A, Mahvi AH, Alimohammadi M, Nazmara S, Pahlevanzadeh B. Modeling perchloroethylene degradation under ultrasonic irradiation and photochemical oxidation in aqueous solution.
IRANIAN JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2012;
9:32. [PMID:
23369271 PMCID:
PMC3698528 DOI:
10.1186/1735-2746-9-32]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 12/22/2012] [Indexed: 12/07/2022]
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.
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