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정수장 float 를 형성하는 미세기포의 실채와 영향인자
곽동희,김영철,이성우,정팔진 ( Dong Heui Kwak,Youngchul Kim,Sung Woo Lee,Paul Gene Chung ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.2
General type of processes treating a water for its public use in Korea, are chemically aided sedimentation tanks followed by rapid sand filters. Settled sludge from a coagulation/flocculation and sedimentation process is easily drained into the sludge treatment train from the bottom of tanks but sludge floated along with numerous micro-bubbles on the surface of coagulation/flocculation tanks and head-part of sedimentation tanks, initially built and operated without a skimmer and barrier against moving floats, has caused serious aesthetic and operational problems. In this study, sources of the micro-bubbles combining with floc particles and causing floating sludge, and factors affecting formation of those bubbles were investigated. There are several factors which can produce gas bubbles in the water treatment plant. Pumps and conduits highly pressurized during water intake and transport to the water treatment plant might be one of the possibilities which can produce micro-bubbles due to the pressure differences. The amounts of nitrogen and carbon dioxide gases evolved during prechlorination and coagulation processes were calculated by using actual plant operational data. Changes of interfacial properties of coagulated water were examined as a possibility of enhancing micro-bubbles production. Among these three factors, it was found that changes of surface characteristics had a significant and direct effect on the formation of micro-bubbles at this plant.
곽동희,전훈,정팔진 ( Dong Heui Kwak,Hoon Jeon,Paul Gene Chung ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.2
Many water bodies used for water supply may contain solid particles with a lower density. These solids are hardly removed in the sedimentation unit due to the own tendency of floating. In order to treat this type of water, the dissolved air flotation (DAF) unit is known to be an effective method. A series of laboratory experiments has been performed to investigate the characteristics of solid separation followed by simplification of DAF models in water treatment processes. Results of DAF treatment studies show that total solids removal efficiency depended on the amount of solids attached to bubble on the water surface and residual floating solids in the water. For the enhancement of solid removal efficiency, It is to be desired that surface loading should be operated less than rising velocity of residual floating particles as well as air volume concentration enough.
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,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.