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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.
백상은 ( Sang Eun Back ),김동석 ( Dong Seog Kim ),박영식 ( Young Seek Park ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.6
The application of disinfection models on the plasma process was investigated. Nine empirical models were used to find an optimum model. The variation of parameters in model according to the operating conditions (first voltage, second voltage, air flow rate, pH) were investigated in order to explain the disinfection model. In this experiment, the DBD (dielectric barrier discharge) plasma reactor was used to inactivate Ralstonia Solanacearum which cause wilt in tomato plantation. Optimum disinfection models were chosen among the nine models by the application of statistical SSE (sum of squared error), RMSE (root mean sum of squared error), r2 values on the experimental data using the GInaFiT software in Microsoft Excel. The optimum model was shown as Weibull+talil model followed by Log-linear+ Shoulder+Tail model. Two models were applied to the experimental data according to the variation of the operating conditions. In Weibull+talil model, Log10 (No), Log10 (Nres), δ and p values were examined. And in Log-linear+Shoulder+Tail model, the Log10 (No), Log10 (Nres), kmax, Sl values were calculated and examined.
수중 Plasma 공정을 이용한 Ralstonia Solanacearum 불활성화
백상은 ( Sang Eun Back ),김동석 ( Dong Seog Kim ),박영식 ( Young Seek Park ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.7
A dielectric barrier discharge (DBD) plasma reactor was investigated for the inactivation of Ralstonia Solanacearum which causes bacterial wilt in aquiculture. The DBD plasma reactor of this study was divided into power supply unit, gas supply unit and plasma reactor. The plasma reactor consisted of a quartz dielectric tube, discharge electrode (inner) and ground electrode (outer). The experimental results showed that the optimum 1st voltage, 2nd voltage, air flow rate and pH were for 100 V (1st voltage), 15 kV (2nd voltage), 4 L/min, and pH 3, respectively. At a low 1st voltage, shoulder and tailing off phenomena was observed. The shoulder phenomenon was decreased as the increase of 1st voltage. R. Solanacearum disinfection in the lower air flow rate was showed shoulder and tailing off phenomenon because the active species generated less. Under optimum condition, shoulder and tailing off phenomenon was reduced. When the 2nd voltage was less than 7.5 kV, tailing off phenomenon was observed and this was not vanishes even though the increase of the disinfection time. The inactivation efficiency increased as the increase of air flow rate, however, the efficiency decreased when the air flow rate was above 4 L/min. R. Solanacearum disinfection at pH 3 showed somewhat higher than in pH 11. The pH effect of R. Solanacearum deactivation is less than the impact on other factor.
플라즈마 공정을 이용한 Fusarium oxysporum과 Phytophthora capsici의 불활성화에 관한 연구
박영식 ( Young Seek Park ),이종휘 ( Jong Hwi Lee ),김호진 ( Ho Jin Kim ),백상은 ( Sang Eun Back ),박지민 ( Ji Min Park ),문휘 ( Whee Moon ),김동석 ( Dong Seog Kim ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1
The purpose of this study is to figure out the inactivation of Fusarium oxysporum and phyophthora capsici using plasma process in conditions(primary voltage, secondary voltage, amount of air, concentration of NaCl, and pH). When both primary voltage and secondary voltage was increased, the inactivation of F. oxysporum was increased. Also, When both amount of air supply and the concentration of NaCl was increased, the inactivation of F. oxysporum was increased. However, when pH was decreased, the inactivation of F. oxysporum was increased. And, by adding P. capsici to this study, We can compare P. capsici with F. oxysporum.