Concentrations of N03- range from 5 to 8 mg/L are typical of biologically well-treated effluents discharged from domestic wastewater treatment plants. Oxidation process using UV is increasingly being used to oxidize complex organic subtances in those treated effluents for water reuse. However, nitrate ion, N03-, is a well-known strong absorber of UV light (UV) in case of its wavelengths generally below 250nm. The major objective of this study is to delineate the effect of nitrate ion on UV oxidation of toluene by conducting a bench-scale operation at various reaction times, and initial concentrations of H202 and N03-. In this study, it has found that toluene could not be completely removed by UV oxidation under the operating conditions described above. The removal of toluene could be expected to be about 11, 20, 27%, respectively, by the photolysis of H2O2 where the reactor was operated at a reaction time of 2 minutes with initial H2O2 concentrations were 0, 50, 200 mg/L in the reactor. The higher concentration of H2O2 is, the better removal of toluene is expected. When the initial N03- concentration is higher, the removal ratio seems to be lower. As a result, in case N03- concenration is too high in water, that can act a role of scavengers.
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