• 한국물환경학회지
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• 제26권4호
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• pp.580-584
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• 2010

As water becomes more scarce around the world the reuse of treated wastewater is being recenlty considered as indispensible trend we need to follow. Especially, industrial area consuming large amount of water has been encouraged to reuse the treated wastewater to secure sufficient water for the production of merchandise. In this study, a study of advanced oxidation process for treatment of industrial wastewater. The treatment performance of UV and ozoznation and five types advanced oxidation processes such as UV/AC, UV/Catalyst, $O_3$/Catalyst, UV/$O_3$/Catalyst was experimentally investigated for reuse of industrial wastewater. The removal efficiency of $COD_{Cr}$, color were relatively evaluated in each treatment unit simulated outflow water of wastewater treatment area. UV/$O_3$/Catalyst process showed the highest $COD_{Cr}$ remaval and color remaval among proposed oxidation process.

• 공업화학
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• 제22권6호
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• pp.617-622
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• 2011

축산폐수 혐기소화 유출수 중의 생물학적 난분해성 유기물의 분해를 위하여 오존 기반의 고도산화 기술을 적용하였다. 배출수의 COD 및 색도는 각각 9200~9500 mg/L 및 0.384 (400 nm)이고 1/10 희석하여 실험에 사용하였다. 공급 오존은 버블의 크기가 $13{\mu}m$인 마이크로버블 오존과 $105{\mu}m$인 일반 오존버블과의 차이를 고찰하였다. 마이크로버블 오존을 사용함으로써 오존의 용해도와 라디칼 생성량이 증가되었고 일반 오존버블에 비하여 COD 및 색도의 제거효율이 각각 85% 및 26% 향상되었다. 마이크로버블을 포함한 $O_3/UV$, $O_3/H_2O_2$, $O_3/UV/H_2O_2$의 조합을 비교한 결과 오존 단독 처리에 비하여 색도 제거율이 5~10% 정도 증가되었으며, 오존에 비하여 UV나 $H_2O_2$의 색도제거에 대한 기여가 크지 않음을 알 수 있었다. 반면 COD에 대해서는 $O_3/UV/H_2O_2$ 적용시 오존 단독에 비하여 2배 이상 제거율이 증가하였으며 UV보다는 $H_2O_2$의 기여도가 더 컸다. 한편 마이크로 오존의 사용시 증가된 용존오존 및 라디칼 활성으로 인하여 오존 공급을 중단한 후에도 UV 또는 $H_2O_2$를 적용함으로써 추가적인 COD 분해 효과를 지속적으로 유지할 수 있었다.

• 한국환경보건학회지
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• 제26권3호
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• pp.61-68
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• 2000

The use of photo-catalytic processes in pollution abatement and resource has a significant economic importance. Therefore, the applications of photochemical oxidation of secondary effluent driven by UV, TiO2, TiO2/UV, H2O2/UV and TiO2/H2O2/UV, have been investigated in order to treat the secondary effluent from municipal sewage. Various experimental parameters such as BOD, CODcr, Nurbidity, total P, and SPC were examined in each photo-catalytic reaction system. The results showed that the application of single oxidant such as UV, TiO2 only has a minor effect on parameters reduction (CODcr, BOD, etc) to treat the secondary effluent, whereas the combinations of oxidants increase the removal efficiency. The best removal efficiency in every parameters was achieved by the combination of TiO2, H2O2 and UV. It was also found that the optimum amount of TiO2 for the treatment was 1g/ι to achieve water reuse standard. From the results, the photocatalytic reaction system can be an alternative as a post-treatment to treat the secondary effluent from municipal sewage.

• 환경위생공학
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• 제17권1호
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• pp.69-74
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• 2002

This study explored for treatment processes by investigating the treatment efficiency and reaction mechanism through oxidation reaction using UV and $O_3$ as oxidant in compensate the wastewater containing nitrobenzene that is non biodegradable organic. Also by modeling these reactions, we try to step explanation of optimum reaction rate and reaction mechanism as the development of the computer program predictable the reaction rate by modeling the reaction. By using this model, after kinetic constant for each reaction from an experimental data is made an optimization and for hardly contribute to reaction rate in reaction kinetic equation is made an ignorance and suppose the simplified reaction mechanism, examined the propriety of computer simulation model and simplified reaction mechanism by comparing and inspecting the reaction kinetic constant and masstransfer coefficient. An investigation results for destructional treatment of nitrobenzene in the wastewater as non-biddegradable organic using UV, $O_3{\;}O_2{\;}H_2O_2-UV$ as oxidant.

• 상하수도학회지
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• 제10권4호
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• pp.64-72
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• 1996

The effect of $O_3$, $O_3/pH$, and $O_3/H_2O_2$, $O_3/UV$, and $H_2O_2/UV$ advanced oxidation process(AOP) were investigated for the treatment of tetrachloroethylen(PCE) at various condition. The removal efficiency of 10, 20, and 30ppm PCE by ozonation were almost same, only about 60%. And pseudo first-order rate constants, ko for overall oxidation was about 0.097($min^{-1}$). In the $O_3/pH$ AOP experiment for the 20ppm PCE, the removal rate of PCE increased with the increase of pH. However, mineralization rate of PCE at pH 7 was higher than at pH 10. In the $O_3/H_2O_2$ AOP, the removal rate of PCE was the highest at peroxide-to-ozone dosage ratio of about 0.9, which PCE was removed over 99.95%. Despite 42% of PCE was directly photolyzed by the UV irradiation, the removal efficiency of PCE by $O_3/UV$ AOP was only about 70%. In $H_2O_2/UV$ AOP, the removal efficiency of PCE increased to about 98% in proportion to the $H_2O_2$ injection concentration at constant UV intensity of 5W/l.

• 한국지하수토양환경학회지:지하수토양환경
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• 제12권5호
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• pp.105-114
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• 2007

Advanced oxidation processes(AOPs)는 강력한 산화제인 hydroxyl radical(${\cdot}OH$)를 생성하여 오염물질을 산화시키는 기법이다. 본 연구에서는 DNAPL인 trichloroethylene(TCE)과 tetrachloroethylene(PCE)의 수리학적 특성을 고려하여 우수한 고도산화처리기법($UV/Fe^{3+}$-chelating agent/$H_2O_2$기법, $UV/H_2O_2$기법)의 적용성 평가를 실시하였다. TCE, PCE 처리에 있어 가장 높은 분해효율을 보인 기법은 $UV/H_2O_2$기법으로 pH 6의 중성조건에서 TCE의 경우 150분 만에 99.92%의 TCE 분해를 나타내었고($[H_2O_2]$ = 147 mM, UV dose = 17.4 kwh/L), PCE의 경우 반응 2시간에 99.99%가 분해되었다($[H_2O_2]$ = 29.4 mM, UV dose = 52.2 kwh/L). 또한, $UV/Fe^{3+}$-chelating agent/$H_2O_2$기법을 적용하였을 경우, TCE는 90분 만에 99.9% (UV dose = 34.8 kwh/L, $[Fe^{3+}]$ = 0.1 mM, [Oxalate] = 0.6 mM, $[H_2O_2]$ = 147 mM) PCE는 반응시간 6시간 만에 99.81% (UV dose = 17.4 kwh/L, $[Fe^{3+}]$ = 0.1 mM, [Oxalate] = 0.6 mM, $[H_2O_2]$ = 29.4 mM)의 빠른 분해경향을 보였다. 이러한 결과는 기존의 고도산화처리기법 중 modified Fenton 반응에 UV를 적용함으로서 반응 중 $H_2O_2$의 재생산을 증가시킬 수 있음을 보여주고 있다. 또한, Fe(III) 이온의 Fe(II) 이온으로의 환원을 용이하게 하여 기존 Fenton 반응에 비해 처리시간의 단축 및 분해효율의 향상을 기대할 수 있을 것이다. 그리고, oxalate나 acetate같은 저분자 유기산 착제의 적용으로 pH의 안정성과 분해효율의 향상이 가능하고, 철이온 및 oxalate나 acetate와 같은 물질이 자연상에 존재함에 따라 보다 경제적이고 친환경적인 실용적 처리기법 도출이 가능할 것이다.

• 한국환경과학회지
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• 제15권7호
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• pp.677-688
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• 2006

Currently, the application of $TiO_2$ photocatalyst has been focused on purification and treatment of wastewater. However, the use of conventional $TiO_2$ slurry photocatalyst results in disadvantage of stirring during the reaction and of separation after the reaction. And the usage of artificial UV lamp has made the cost of photocatalyst treatment system high. Consequently, we studied that solar light/$TiO_2$ film system was designed and developed in order to examine disinfection characteristics of sewage wastewater treatment. The optimum conditions for disinfection such as solar light intensity, characteristic of sewage wastewater, amounts of $TiO_2$ and comparison of solar ligth/$TiO_2$ systems with UV light/$TiO_2$ system was examined. The results are as follows: (1) photocatalytic disinfection process with solar light in the presence of $TiO_2$ film more effectively killed total coliform (TC) than solar light or $TiO_2$ film absorption only. (2) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with remain resistant material. (3) The survival ratio of TC and residual ratio of organic material (BOD, CODcr) decreased with the increase of amounts of $TiO_2$. (4) TC survival ratio decreased linearly with increasing UV light intensity. (5) The disinfection effect of solar light/$TiO_2$ slurry system decreased more than UV light/$TiO_2$ film systems. (6) The disinfection reaction followed first-order kinetics. We suggest that solar light instead of using artificial UV light was conducted to investigate the applicability of alternative energy source in the disinfection of TC and the degradation of organic material.

• 대한토목학회논문집
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• 제14권3호
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• pp.645-654
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• 1994

광촉매 산화반응의 기본 운영조건-재순환을 속도 275 mL/min, 산소 공급량 2LPM, $UV+TiO_2+H_2O_2$(500 mg/l)을 새로운 광촉매 산화반응에 의한 유기물질 분해 수처리 공정으로 적용하였다. 탁도와 부유물질의 농도가 증가함에 따라 탁도 10 NTU-부유물질 농도 29 mg/l까지는 페놀분해가 감소하지 않고 약간 증가하는 추세를 보였고, 탁도 50 NTU-부유물질 농도 170 mg/l까지는 어느정도 페놀분해가 감소하고 있으나 탁도와 부유물질이 없는 경우와 비슷한 정도로 페놀 분해가 이루어졌다. 페놀 분해율은 유입페놀 농도가 증가할수록 감소하였다. 본 연구에서 이용한 $UV+TiO_2+H_2O_2$ 광촉매 산화반응은 정수처리공정의 고도산화법, 생물학적 폐-하수 처리의 후처리 공정으로 이용 가능할 것으로 판단된다.

• 환경위생공학
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• 제15권4호
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• pp.26-34
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• 2000

In order to treat the dyeing wastewater, the $UV/TiO_2/H_2O_2$ system was investigated, and proper pretreatment methods were examined to reduce the load on the system considering economical and technical efficiency. The results of this study were as follows: 1. $UV/TiO_2/H_2O_2$ system with pretreatment process was adopted, the result of Chemical coagulation and pH control units was $pH{\;}11{\;}{\rightarrow}{\;}coagulation{\;}{\rightarrow}{\;}pH{\;}4$ and the optimum dosage of $FeCl_3$ was $600mg/{\ell}$. 2. Proper dosage of $TiO_2$ in the $UV/TiO_2/H_2O_2$ system with pretreatment process was $2g/{\ell}$ and $H_2O_2$ was $1000mg/{\ell}$, UV contact time was 20min to get $200mg/{\ell}$ of $COD_{Cr}$.

• 한국환경과학회지
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• 제26권3호
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• pp.303-309
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• 2017

Aeration with low energy micro-bubble generation and $UV/H_2O_2$ processes was introduced to verify the possibility of oxidation treatment for acid mine drainage. During 10 hours of aeration with micro-bubbles, Fe and As concentrations were decreased to 18.1 and 61.8%, respectively, while Cu, Cd, Al were kept at influent concentrations. Other heavy metals such as Mn, Cr, Pb, Zn, and Ni concentrations fluctuated due to the repetition of oxidation and release. Twenty days of aeration indicated the oxidation possibility for Cu, Cd, and Al. With the employment of $UV/H_2O_2$ processes, more than 77% of Cu and Fe removed, whereas slightly more than 30% of Cd and Al removed.