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Ozonation of p-chlorophenol in aqueous solution
1Fac. di Ingegneria, Dip. di Ingegneria Chimica, Univ. degli Studi di Napoli "Federico II", p.le V. Tecchio, 80-80125, Napoli, Italy. andreo@hp3.irc.na.cnr.it
Journal of Hazardous Materials
|October 28, 1999
Summary
Ozonation of p-chlorophenol (CHP) is pH-dependent, with limited chlorine release even after substrate degradation. The process occurs in a quasi-diffusional regime, modeled mathematically.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Oxidation Processes
Background:
- p-chlorophenol (CHP) is a persistent organic pollutant in wastewater.
- Ozonation is a potential advanced oxidation process for degrading CHP.
- Understanding CHP ozonation kinetics and mechanisms is crucial for effective treatment.
Purpose of the Study:
- To investigate the ozonation of p-chlorophenol (CHP) in aqueous solutions.
- To determine the influence of pH on CHP ozonation reactivity and chlorine release.
- To model the ozonation process under varying conditions.
Main Methods:
- Experimental ozonation of CHP in aqueous solution across a pH range of 2.0-8.0.
- Inclusion of tert-butyl alcohol to suppress radical oxidation pathways.
- Development and application of a mathematical model to simulate the system.
Main Results:
- pH significantly impacts the reactivity of the ozonation system.
- Partial chlorine release was observed even after complete CHP disappearance.
- The oxidation process operates under a quasi-diffusional regime with reaction.
Conclusions:
- Ozonation of CHP is a pH-sensitive process.
- Complete dechlorination is not achieved solely through ozonation under studied conditions.
- The developed mathematical model accurately simulates the observed ozonation behavior.