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DOI : 10.17640/KSWST.2022.30.5.47 , Vol.30, No.5, 47 ~ 57, 2022
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| Title |
| Comparison of Microcystin-LR Elimination between UV/chlorine and UV/H2O2 |
| 남숙현 Sookhyun Nam , 이주원 Joowun Lee , 김은주 Eunju Kim , 구재욱 Jaewuk Koo , 황태문 Tae-mun Hwang |
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| Abstract |
| Microcystin-LR (MC-LR), the most widely known toxin produced in cyanobacteria, is problematic because of its toxicity. This study was carried out to evaluate the capability of ultraviolet photolysis of chlorine(UV/Cl2) and ultraviolet photolysis of hydrogen peroxide(UV/H2O2). Results showed that direct photolysis with 254 nm UV irradiation achieved substantial toxin removal. In particular, in UV/Cl2 oxidation treatment, the removal rate of MC-LR was improved through various radical reactions that were similar to UV/H2O2. In the UV/chlorine process at the pH of 7.0, UV irradiation amount of100 mJ/cm2 and chlorine concentration of 0.3 mg/L, the MC-LR removal rate was 52.0%, indicating that the removal rate was increased by 24% compared to the UV only treatment. In the UV/chlorine and UV/H2O2 process at pH 7.0, the first-order degradation rate constants of MC-LR were 3.1×10-3~3.6×10-3 s-1 and 2.9×10-3~3.7×10-3 s-1, respectively. It was shown that the degradation rate constant of MC-LR was lowered by 19.4% at pH 9.0 compared to that of pH 7.0, where the analysis found that the change in pH affected oxidation ability. UV/H2O2 was not affected by pH. This result affects the energy consumption needed to meet the required 90% elimination of MC-LR. |
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| Key Words |
| Advanced oxidation process, Microcystin-LR, UV/chlorine, UV/hydrogen peroxide, 고도산화공정, 마이크로시스틴, 자외선/염소, 자외선/과산화수소 |
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