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물리·화학적 처리공정을 이용한 Artemia sp. 불활성화 예측을 위한 소독 모델
정창 ( Chang Zheng ),김동석 ( Dong-seog Kim ),박영식 ( Young-seek Park ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.4
In this study, we examined the suitability of ten disinfection models for predicting the inactivation of Artemia sp. via single or combined physical and chemical treatments. The effect of Hydraulic Retention Time (HRT) on the inactivation of Artemia sp. was examined experimentally. Disinfection models were fitted to the experimental data by using the GInaFiT plug-in for Microsoft Excel. The inactivation model were evaluated on the basis of RMSE (Root Mean Square Error), SSE (mean Sum Square Error) and r<sup>2</sup>. An inactivation model with the lowest RMSE, SSE and r<sup>2</sup> close to 1 was considered the best. The Weibull+Tail model was found to be the most appropriate for predicting the inactivation of Artemia sp. via electrolytic treatment and electrolytic-ultrasonic combined treatment. The Log-linear+Tail model was the most appropriate for modeling inactivation via homogenization and combined electrolytic-homogenization treatment. The double Weibull disinfection model was the most suitable for the predicting inactivation via ultrasonic treatment.
메시형 알루미늄 전극을 이용한 전기응집/부상 공정에서 Kaoline의 탁도 제거
정창 ( Chang Zheng ),김동석 ( Dong-seog Kim ),박영식 ( Young-seek Park ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.5
The Electrocoagulation-Flotation (ECF) process has great potential in wastewater treatment. ECF technology is effective in the removal of colloidal particles, oil-water emulsion, organic pollutants such as microalgae, and heavy metals. Numerous studies have been conducted on ECF; however, many of them used a conventional plate-type aluminum anode. In this study, we determined the effect of changing operational parameters such as power supply time, applied current, NaCl concentration, and pH on the turbidity removal efficiency of kaoline. We also determined the effects of different electrolyte types (NaCl, MgSO<sub>4</sub>, CaCl<sub>2</sub>, Na<sub>2</sub>SO<sub>4</sub>, and tap water), as well as the differences caused by using a plate-type and mesh-type aluminum anode, on the turbidity removal efficiency. The results showed that the optimal values of ECF time, applied current, NaCl concentration, and pH were 5 min, 0.35 A, 0.4 g/L NaCl in distilled water, and pH 7, respectively. The results also revealed that the turbidity removal efficiency of kaoline in different electrolytes decreased in the following sequence, given the same conductivity: tap water > CaCl<sub>2</sub> > MgSO<sub>4</sub> > NaCl > Na<sub>2</sub>SO<sub>4</sub>. The turbidity removal efficiency of the mesh-type aluminum anode was significantly greater than the plate-type aluminum anode.
전기 화학적 공정에서 수질(PO43-, NH4+, COD, SS)이 E. coli 불활성화에 미치는 영향에 관한 연구
백상은 ( Sang Eun Back ),신원섭 ( Won Sup Shin ),정창 ( Chang Zheng ),장경원 ( Kyung Won Jang ),박영식 ( Young Seek Park ),김동석 ( Dong Seog Kim ) 대구가톨릭대학교 자연과학연구소 2010 자연과학연구논문집 Vol.8 No.1
A study was conducted to investigate the effect of water qualities (PO43-, NH4+, COD, SS) on the inactivation of Escherichia coli in electrochemical process. In order to investigate the production of OH radical, N-dimethyl-4-nitrosoaniline (RNO) was used as an indirect index for OH radical. The degradation rate of RNO increased as the increase of the initial RNO concentration and current amount. The effect of NH4+ and COD on the RNO removal was not significant. The RNO removal decreased as the increase of the initial T-P concentration.