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정팔진,이은주,김민정,Chung, Paul-Gene,Lee, Eun-Ju,Kim, Min-Jeong 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
This paper was studied about the characteristics of treatment by ionized gas for livestock wastewater, aiming at the effects of ionized gas on organic matter, hydrophobic and hydrophilic organic matter in livestock wastewater when the new process of advanced oxidation process was applied for meeting the improved the quality of effluent. The organic matter within treated livestock wastewater by ionized gas was partially mineralized according to the time increasement. The $TCOD_{Mn}$ in the livestock wastewater was decreased from 840mg/L to 340mg/L when treated by ionized gas by the enhancement of time. We occupied the equations of $TCOD_{Cr}$, $SCOD_{Cr}$, $TCOD_{Mn}$ and $SCOD_{Mn}$ as to ionized gas treated time. As $TCOD_{Mn}$ increasing ionized gas treated time, the concentration did not meet the water quality, $COD_{Mn}$ 4Omg/L. So, for removing of the remaining organic matter in the efflent after ionized gas, following process is necessary. After treating the livestock wastewater by ionized gas, coagulation was considerable for organic matter removal up to regulation water quality. From UV scans of the treated livestock wastewater by ionized gas, the wastewater has low aromaticity and good colour.
고정상 및 유동상 생물여과를 이용한 상수의 전처리 (2)
정팔진,이영동,곽동희 ( Paul Gene Chung,Young Dong Lee,Dong Heui Kwak ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
The biological treatment method for slightly polluted raw water was studied by using both a fixed-bed biofilter packed with filamentous media and a fluidized-bed biofilter packed with spongy media. The characteristic of this biofilter was able to be expressed as Se= So· e^( 0.0863◎), which was proposed as a kinetic model for thrickling filter by Eckenfelder. With the object to overcome a problem, the decrease of nitrification efficiency in the conventional biological treatment at low water temperature, a small-scale reactor with nitrifying bacteria immobilized in synthetic PEG beads was applied. The efficiency of the reactor for the nitrification of NH₃-N was found to be worse at wormer water temperature(2l℃, 24℃), but better at low water temperature(6℃, 12℃) than that of the conventional biofilter. In addition, it was confirmed that the process used in this study can be safe from intestinal pathogenic microorganisms and others, if all operation conditions for the conventional processes are satisfied.
정팔진,이은주,김민정,조선영,Chung, Paul-Gene,Lee, Eun-Ju,Kim, Min-Jeong,Cho, Sun-Young 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
Laboratory studies were carried out to find out the characteristics of humic acid treatment by activated carbon and ionized gas, In order to increase oxidation power of ionized gas for treating organic matter, we used granular activated carbon. By using $UV_{254}$, easy analysis method, we calculated humic acid concentration and $SCOD_{cr}$ concentration. For an initial concentration of humic acid, 10, 50 and 100ppm, the reaction rate constant by $UV_{254}$ was $8.98{\times}10^{-3}$/min, $5.62{\times}10^{-3}$/min and $4.8{\times}10^{-3}$/min respectively due to the same flow rate of ionized gas. When we added activated carbon to the ionized gas for humic acid treatment, the reaction rate constant increased in 4.13, 3.65 and 3.15 times. So, by using activated carbon in treating humic acid by ionized gas, oxidation power of organic matter by ionized gas was increased. The hydrophobic fraction constitutes 98% of organic matter for humic acid at the beginning. After the treatment using ionized gas for humic acid, the hydrophobic fraction decreased by 63~65% and the hydrophilic one increased by 35~37%. So, it was proved that the treatment increased the hydrophilic fraction in organic matter.
Bone Charcoal 에 의한 폐수중의 중금속 흡착특성
정팔진(Paul Gene Chung),곽동희(Dong Heul Kwak),이재욱(Jae Wook Lee) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
The study was conducted to evaluate the adsorption equilibrium of heavy metals on bone charcoal made of livestock bone which was sintered at 550-600℃. Analysis of bone charcoal by XRD and FT-IR showed that crystal structure was similar to that of synthetic hydroxyapatite. Adsorprption equilibrium capacity of single component (Pb, Cd, and Zn) on bone charcoal could be expressed as Langmuir, Freundlich, and Sips equations. Sips isotherm was best among the three isotherms. The values predicted by IAST (ideal adsorbed solution theory) showed good relationship to the experimental data in multicomponent adsorption equilibrium. Adsorption affinity was in order of Pb. Cd, and Zn. The order was same in case of activated carbon or synthetic hydroxyapatite. Through the study results, it would be expected that bone charcoal made of livestock could be used in field of wastewater treatment plants as adsorbent to remove heavy metal.
정팔진 ( Paul Gene Chung ),김민정 ( Min Jeong Kim ),박정훈 ( Jeong Hun Park ),안문호 ( Wen Hao An ) 전북대학교 공학연구원 (구 전북대학교 공업기술연구소) 2005 工學硏究 Vol.36 No.-
In this study, water quality characteristics in rainwater samples was analyzed to examine the microbial risk of rainwater for utilization. Unlike the quality of ground water and surface water, only a few total colonies have found in the precipitation samples. Many colony which inhabits in rainwater(rain-off) was found. It was examine water quality of rainwater. The study covers six months monitoring period. pH varied from 3.2 to 7.6 and color ranged from 20 to 60 CU. Turbidity was below 50NTU. The coliforms number ranged from 1000 to 41,111 number/ml. In the present study, a feasibility of an advanced oxidation using Plasma, Ozone, UV process for rainwater reclamation was investigated. Plasma, Ozone, UV process were introduced as a disinfection method to increase the killing effect for microorganisms. Contact time was changed from 3min to 20min to determine the optimum operation condition for the system. Increasing contact time, The coliforms number and the total colonies number was rapidly decreased. It is interesting to note that a 100% reduction in total coliforms and total colonies were achieved. Total coliforms and total colonies were successfully inactivated to the level of satisfying. Besides disinfection of the coliforms, approximately a 50% removal in DOC was pronounced at a contact time of 10min. More than 90% removal in turbidity, ss and color was also observed at a contact time of 10min with plasma. The application of plasma appeared to be one of options to reuse rainwater.