Iranian Association of Environmental Health (IAEH)
Abstract
In present study, degradation of p-chlorophenol using several oxidation
systems involving advanced oxidation processes such as
ultraviolet/H2O2, microwave/H2O2 and both in the absence of hydrogen
peroxide in batch mode by photolytic pilot plant and modified domestic
microwave oven was evaluated. The oxidation rate was influenced by many
factors, such as the pH value, the amount of hydrogen peroxide,
irradiation time and microwave power. The optimum conditions obtained
for the best degradation rate were pH=7 and H2O2 concentration of 0.05
mol/L for ultraviolet/H2O2 system and pH=10.5, H2O2 concentration of
about 0.1 mol/L and microwave irradiation power of about 600W for
microwave/H2O2 system at constant p-chlorophenol concentration. The
degradation of p-chlorophenol by different types of oxidation processes
followed first order rate decay kinetics. The rate constants were
0.137, 0.012, 0.02 and 0.004/min1 for ultraviolet/H2O2, microwave/H2O2,
ultraviolet and microwave irradiation alone. Finally a comparison of
the specific energy consumption showed that ultraviolet/H2O2 process
reduced the energy consumption by at least 67% compared with the
microwave/H2O2 process
