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자외선/염소 및 자외선/과산화수소 기술에 의한 Microcystin-LR 처리 특성 비교
남숙현 ( Sookhyun Nam ),이주원 ( Joowun Lee ),김은주 ( Eunju Kim ),구재욱 ( Jaewuk Koo ),황태문 ( Tae-mun Hwang ) 한국수처리학회 2022 한국수처리학회지 Vol.30 No.5
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/Cl<sub>2</sub>) and ultraviolet photolysis of hydrogen peroxide(UV/H<sub>2</sub>O<sub>2</sub>). Results showed that direct photolysis with 254 nm UV irradiation achieved substantial toxin removal. In particular, in UV/Cl<sub>2</sub> oxidation treatment, the removal rate of MC-LR was improved through various radical reactions that were similar to UV/H<sub>2</sub>O<sub>2</sub>. In the UV/chlorine process at the pH of 7.0, UV irradiation amount of100 mJ/cm<sup>2</sup> 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/H<sub>2</sub>O<sub>2</sub> process at pH 7.0, the first-order degradation rate constants of MC-LR were 3.1×10<sup>-3</sup>~3.6×10<sup>-3</sup> s<sup>-1</sup> and 2.9×10<sup>-3</sup>~3.7×10<sup>-3</sup> s<sup>-1</sup>, 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/H<sub>2</sub>O<sub>2</sub> 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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먹는물의 미생물 실시간 감시를 위한 온라인 ATP 측정법의 적용
남숙현 ( Sookhyun Nam ),황태문 ( Tae-mun Hwang ),김은주 ( Eunju Kim ),안주석 ( Jooseok An ),구재욱 ( Jae-wuk Koo ),이주원 ( Joowun Lee ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.5
The evaluation of microbial contamination in drinking water is a major concern worldwide. Adenosine triphosphate (ATP) monitoring can serve as a complement to the HPC method currently used for water quality tests because it offers rapid measurement, ease of use, and activity against microorganisms. In this study, we proposed an alternative to in situ rapid microbial monitoring methods. The ATP levels in tap water and surface-treated water were monitored using an online ATP analyzer. The ATP level of the surface-treated water was three times higher than that of the tap water. Furthermore, the correlation between E. coli and ATP confirmed that if the number of microorganisms in water is small, the ATP data must be obtained according to the target water characteristics to enable the monitoring for microbial viability in drinking water. For effective E. coli monitoring, online ATP data was stored in its own server database and an internet-of-things (IoT)-based microbial monitoring system was established and successfully applied. Recent advances in the ATP technology and IoT technology have enabled the quick and accurate online monitoring of the ATP level in water. This helps in maintaining the microbial stability of drinking water by detecting the signs of its microbial contamination early and to process it as quickly as possible.
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