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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.
상수원수중의 THM 전구물질과 상수중의 THM 제거에 관한 연구
정팔진,임봉수,김영철,김영규 ( Paul Gene Chung,Bong Su Lim,Young Chul Kim,Young Kyu Kim ) 한국물환경학회 1992 한국물환경학회지 Vol.8 No.1
It has been confirmed that some Trihalomethanes(THMs) suspected as carcinogens, can be formed during chlorination for water supply through the reaction of chlorine and humic substances in water. A lot of researches have showed that the amount of THMs formed during chlorination can be reduced by the removal of humic substances in water, which are THM precursors. In this study, the removal efficiencies of THM precursors by 10 sets of water treatment processes were examined for artificial water samples prepared by dissolving humic acids in tap water aerated for 48 hours. The removal efficiencies were estimated by measuring the concentrations of THMs formed when sample was mixed with chlorine. The estimated removal efficiencies were ranged from 30% of simple ozonation to 96% of ozonation followed by flocculation and sand filtration. The best process selected in this study was extended to the treatment of water collected from Chonju water supply sources. The result also showed the removal efficiency of THM formation potential is higher than 95%.
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.
정팔진,곽동희 ( Paul Gene Chung,Dong Heui Kwak ) 한국물환경학회 1994 한국물환경학회지 Vol.10 No.1
In this study, the degree of polluted raw water treatment of microbes has been measured by dissolved organic matters, NH₃-N, ABS, phenol, and THM_(FP) etc., which not removed conventional water treatment plant effectively. The objective of this study is to investigate the removal characteristics and efficiency of the bio-filter processes. The estimated values for kinetic coefficients were K,=31.89㎎/ℓ, k=1.55day^(-1), μ_m=0.88day ^(-1), Y=0.57gVSS/gBOD_(removed) and k_d=0.08day^(-1). In the low loading rate of low substrate(0.02 -1.5㎏ COD/㎥·day), fixed-bed reactor could be operated at steady-state, but fluidized-bed reactor was hard to operate at steady-state for decrease of pellet growth rate and increase of specific pellet density. The removal efficiency was more sensitive to NH₃-N loading rate than KMnO₄ loading rate. It was possible to linearize the relationship between the water temperature and removal efficiency as well as the relationship between loading rate of substrates and removal efficiency.
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.
Burkholderia cepacia를 이용한 축산폐수의 처리
정팔진 ( Paul Gene Chung ),조선영 ( Seon Yeong Jo ),현미희 ( Mi Hee Hyun ),김민정 ( Min Jeong Kim ),이은주 ( Eun Ju Lee ),전민식 ( Min Sik Jeon ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.6
We found that the Bacterium Burkholderia cepacia in livestock wastewater treatment plant was predominant species. We investigated the growth rate of this and treatment characteristics for organic matter and nitrogen removal in livestock wastewater using this microorganism. First, we cultured B. cepacia. And then, to conducted treatment for livestock wastewater by using B. cepacia., we changed C/N from 0.2~4.4. When we operated A and B process, changing F/M ratio from 1.2 to 4.4. In experiment of C/N variations, when C/N was 1.8, we found that the optimal condition for organic matter and nutrient removal effect was higher and the removal efficiency of SCOD_(cr), SBOD_5, NH₄-N was 78.4%, 95% and 74.8%. So, It is possible to treat the wastewater having the lower C/N contents such as livestock wastewater using this microorganism. In experiment of A and B process for livestock wastewater, we found that the removal efficiency of organic matter and nitrogen in operating mode of A process was higher than that of B process. Also, the optimal F/M operating A process was 0.013 and the removal efficiency of SBOD_5, SCOD_(cr), TN and TP were 97%, 60%, 95% and 91%.