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박중현,권대영 대한상하수도학회 1994 상하수도학회지 Vol.8 No.1
It is well known that the adsorption character of activated carbon is dependent on the specific surface area and pore volume, but the relationship between the surface-chemical structure and the adsorption character has not been studied very often. The purpose of this study is to investigate the effect of the acidic surface functional groups of activated carbon and the adsorption characteristics of low concentration phenol. So three types of activated carbons and four different treatments were introduced to this isotherm experiment. These treatments were nontreatment, 1N HNO_3 treatment, 6N HNO_3 treatment, H_2O_2 treatment. The conclusions of this study are as followings. If the initial concentration of phenol is high as 5㎎/ℓ, the adsorption is dependent on the specific surface area. If the initial concentration of phenol is low as 100㎍/ℓ, the adsorption is dependent on the average pore volume. The acidic surface functional groups prevent the adsorption of phenol molecules to activated carbon. And the adsorbed amount decreases more for HNO_3 treatment than for H_2O_2 treatment and more for concentrated HNO_3 treatment than for dilute HNO_3 treatment.
광촉매 산화 반응을 이용한 클로로페놀 분해에 관한 연구
박중현,이상협,박주석 대한상하수도학회 1995 상하수도학회지 Vol.9 No.4
The Electron/Hole Pair is generated when the activation energy produced by ultraviolet ray illuminates to the semiconductor and OH-ion produced by water photo-cleavage reacts with positive Hole. As a results, OH radical acting as strong oxidant is generated and then Photocatalytic oxidation reaction occurs. The photocatalytic oxidation can oxidate the non-degradable and hazardous organic substances such as pesticides and aromatic materials easier, safer and shorter than conventional water treatment process. So in this study, many factors influencing the oxidation of chlorophenols, such as inorganic electrolytes addition, change of oxygen and nitrogen atmosphere, temperature, pH, oxygen concentration, chlorophenol concentration, were throughly examined. According to the experiments observations, it is founded that the rate of chlorophenol oxidation follows a first-order reaction and the modified Langmuir-Hinshelwood relationship. And the photocatalytic oxidation occurs only when activation energy acting as Electron/Hole generation, oxygen acting as electron acceptor to prevent Electron/Hole recombination. TiO_2 powder acting as photocatalyst are present. The effects of variation of dissolved oxygen concentration, temperature and inorganic electrolytes concentration on 2-chlorophenol oxidation are negligible. And the lower the organic concentration, the higher the oxidation efficiency becomes. Therefore, the photocatalytic oxidation is much effective to oxidation of hazardous substances at very low concentration. The oxidation is effective in the range of 0.1g/L-10g/L of TiO_2. Finally when the ultra-violet ray is illuminated to TiO_2, the surface characteristics of TiO_2 change and Adsorption/Desorption reaction on TiO_2 surface occurs
활성탄 흡착에 의한 취기유발물질(臭氣誘發物質)제거에 관한 연구 : GEOSMIN , 2-MIB 를 중심으로
박중현,권봉기,김한승 대한상하수도학회 1994 상하수도학회지 Vol.8 No.2
The occurrence of objectionable tastes and odors in drinking water is a common and widespread program. The most troublesome odors are usually those described as muddy or earthy-musty. Two organic compounds which have been implicated as the cause of earthy-musty odor problems in water are geosmin and 2-Methylisoborncol. These earthy-musty organics have been shown to be metabolites of actinomycetes and blue green algae. The purpose of this paper is to describe adsorbability in removing these two odor causing compounds(geosmin and 2-MIB) upon various condition like pH variation, adding humic acid and different activated carbon. The conclusion of this study are as followings. In batch test, carbon dosage is 10㎎/100㎖ for geosmin and 15㎎/100㎖ for 2-MIB. Both were in equilibrium stage after 60 hours. In model simulation, F-P model described experiment data and modelling data appropriately in geosmin but F-S model not. In case of 2-MIB, models didn’t describe relation between experiment and modeling data well. Two causative agents of earthy-musty odor compounds, geosmin and 2-MIB, are strongly adsorbed by activated carbon either coconut or brown. There appears to be no effect of pH(5, 7, 9) on adsorption of these two organics. Activated carbon proved to be more effective for removing geosmin than for removing 2-MIB. When activated carbon is used in removing these two organics, the removal of these appeared to be adversely affected by back ground organic compounds, such at humic substances, due to competitive adsorption.
박중현,류성호 대한상하수도학회 1997 상하수도학회지 Vol.11 No.2
Activated carbon is widely used for the treatment of water, wastewater and other liquid wastes. Biological activated carbon (BAC) process is water and wastewater treatment process developed in the 1970’s. In addition to activated carbon adsorption, biodegradation organic pollutants occurs in the BAC bed where a large amount of aerobic biomass grows. This results in a long operation time of the carbon before having to be regenerated and thus a low treatment cost. Although the BAC process has been widely used, its mechanisms have not been well understood, especially the relationship between biodegradation and carbon adsorption, whether these two reactions can promote each other or whether they just simultaneously exist in the BAC bed. Also, the phenomenon of bioregeneration has been confused that previously occupied adsorption sites appear to be made available through the actions of microorganisms. And that, because biological process is influenced by low temperature, the mechanism of the BAC process is also effected by temperature variation in our country of winter temperature near the freezing point. Therefore, the objective of this study examines closely the mechanism of the BAC process by temperature variation using phenol as substrate. From this study, biological activated carbon is good substrate removal better than non adsorbing materials (charcoal, sand) as temperature variation, especially low temperature(near 5℃).