Abstract
The removal of petroleum-based pollutants from water by ozone is studied. The results indicate that the oxidation effect of ozone on the petroleum-based pollutants is associated with water temperature, pH, dosage of ozone and reaction time. The removal efficiency of petroleum-based pollutants increases with the rise of temperature, pH, amount of ozone and reaction time, and reaches 83% under the conditions that the ratio of ozone to petroleum-based pollutants is 1:1 and the reaction time is 10 min. GC/MS analysis reveals that the amount of petroleum-based pollutants in water is reduced 39% from the previous 61 organics to 37 organics, the total peak area is reduced 36% after ozone oxidation treatment. Therefore, ozone has an excellent effect on the removal of petroleum-based pollutants and can be applied in the treatment of petroleum wastewaters.
Highlights
The results indicate that the petroleum removal and oxidation efficiency increase with the rise of ozone dosage
It is because the increase of ozone dosage results in the rise of ozone concentration in water and oxidation ability, in turn leads to an increased petroleum removal efficiency
High molecular organics can be turned into low molecular organics by oxidation of ozone, and parts of them are directly decomposed into CO2 and H2O
Summary
2.1 Effects of ozone oxidation on the removal of petroleum-based pollutants from water. Ozone oxidation includes direct reaction and indirect reaction. Its reaction rate is associated with the concentrations of pollutants, ozone and ·OH, as well as the direct reaction constant of ozone and indirect reaction constant of ·OH. There are many factors that have effects on the ozone oxidation. This paper mainly discusses the effects of ozone dosage, reaction time, reaction temperature and pH on the oxidation of petroleum-based pollutants
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