• Proceedings of the Korean Nuclear Society Conference
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• 1997.10a
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• pp.375-380
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• 1997

모의 방사성 세탁폐액을 제조하여 오존에 의한 세제 파괴를 확인하고 활성탄 및 이온교환수지를 이용하여 세제 및 Co, Cs 제거율을 조사하였으며 모의 방사성 세탁폐액을 오존으로 부분적으로 산화ㆍ파괴시킨후 활성탄 및 이온교환수지에 의한 흡착 및 이온교환 실험을 수행하여 오존의 세제 파괴가 방사성 물질 제거에 미치는 영향을 조사하였다. 오존에 의해 세제는 75% 정도 제거될 수 있었고 활성탄으로 방사성 모의세탁폐액을 처리할 때 세제농도가 증가하면 방사성 핵종 제거율이 감소하였다. 이온교환수지로 세제를 제거할 때 성취가능 제거율은 Co의 경우 99% 이상이었으며, 세제 존재시 방사성 Co 및 Cs 제거율은 감소하며, 방사성 모의세탁폐액을 오존으로 조사후 활성탄과 이온교환수지로 방사성 핵종을 제거할 때 그 제거율은 거의 변화가 없었다. 이상과 같은 실험 결과로부터 오존으로 부분적으로 산화시켜 활성탄의 세제 제거효율을 최대화하고, 역삼투막에 의한 방사성 핵종을 제거하며 이온교환수지로 잔류 방사성 핵종을 완전히 처리할 수 있는 복합 공정을 도출하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2008.11a
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• pp.350-354
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• 2008

전기/UV 공정에 사용하기 위해 일반적인 살균 램프인 UV-C 램프와 오존도 같이 발생하는 오존 등의 RhB 분해능을 고찰한 결과 오존 램프의 RhB 제거율이 UV-C램프보다 높은 것으로 나타났다. 전해질을 첨가하지 않은 전기/UV 공정에서 최적 전류는 1 A로 나타났다. 전기/UV 공정에서 RhB 제거의 경우 전기분해 공정과 UV 공정의 단일 공정의 RhB 농도감소와 전기/UV 복합 공정의 RhB 제거는 같아 공정의 시너지 효과는 관찰되지 않았다. 그러나 COD의 경우 전기분해 공정과 오존 램프에 의한 단일 공정의 COD 제거보다는 전기/UV 공정의 COD 제거농도가 높아 시너지 효과가 나타나는 것으로 사료되었다.

• Journal of the Korea Organic Resources Recycling Association
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• v.25 no.3
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• pp.5-12
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• 2017

Effects of operating parameters such as activated carbon dose, gaseous $O_3$ concentration and pH on the properties of methylene blue(MB) degradation in a catalytic ozonation were investigated through a series of batch experiments. Activated carbon catalyzed the self-decomposition of ozone, generating $OH{\cdot}$, thus promoting MB degradation. Thus the increase of activated carbon dose enhanced the MB and TOC removal. The higher gaseous ozone concentration injected, the promoted MB and TOC removal obtained through the enhanced mass transfer. The MB removal was not significantly affected by the variation of aqueous pH. Catalytic ozonation can be considered as an efficient alternative in treating refractory pollutants in textile wastewater with faster and higher dye and TOC removal compared with ozonation and adsorption.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.10
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• pp.1099-1107
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• 2005

The purpose of this study was to find the transformation of organic matter as well as chlorine by product formation potential with ozone dosage. The removal percents of $UV_{254}$ and DOC were $23%{\sim}65%$ and $2%{\sim}15%$ and THMFP and HAAFP were $17%{\sim}52%$ and $9%{\sim}29%$ respectively at $0.5{\sim}3\;mgO_3/mgDOC$ ozone dosage. The hydrophobic and transphobic organic matter were reduced to $37%{\sim}68%$ and $35%{\sim}64%$, on the other hand the hydrophilir organic matter was increased to $40%{\sim}49%$ at $0.5{\sim}3\;mgO_3/mgDOC$ ozone dosage. The produced THMFP and HAAFP from the hydrophobic and transphilic organic matter were decreased greatly with increasing ozone dosage but these by products were increased in the hydrophilic matter. The produced THMFP and HAAFP per unit DOC were decreased and reactivity was reduced greatly with increasing crone dosage. The removal rate of THMFP per unit DOC was much higher than HAAFP by ozone treatment. The Br-THMFP per unit DOC was much more removed than chloroformFP per unit DOC with increasing ozone dosage. and The removal rate of TCAAFP per unit DOC was increased with increasing ozone dosage but TCAAFP was not affected by ozone treatment. Br-HAAFP was decreased at $1\;mgO_3/mgDOC$ ozone dosage but was not more removed above $1\;mgO_3/mgDOC$ ozone dosage. Br-HAAFP had lower removal effect than Br-THMFP by ozone treatment. The optimal ozone dosage can be determined about $1\;mgO_3/mgDOC$ by considering both disinfection by product formation and economical efficiency.

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1762-1764
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• 2001

대기환경오염물질인 NO가스의 제거를 위하여 방전관을 채용한 3전극-2갭 방식의 새로운 형태의 오존발생기를 설계 제작하였다. 본 논문에서는 원료가스의 유량, 방전전력 및 오존발생기의 사용 개수 변화에 따른 방전특성과 오존생성특성을 연구검토하였으며, 오존발생기로부터 생성된 오존을 NO가스에 접촉시켰을 때 NO 제거특성이 우수하여 방전관형 오존발생기가 대기환경개선 설비로 적용가능함을 확인하였다.

• Journal of Korean Society of Environmental Engineers
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• v.28 no.2
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• pp.137-143
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• 2006

Three candidate processes(ozone alone, UV alone and ozone/UV combined processes) were evaluated for the removal of diethyl phthalate(DEP). Of the candidates, the ozone/UV process showed the highest removal efficiency of DEP. To elucidate a major oxidant for DEP oxidation in the ozone/UV process, the effects of pH and hydroxyl radical($OH^{\circ}$) scavenger were investigated. As a result, it was found that $OH^{\circ}$ plays a important role for DEP elimination. Meanwhile, the direct reaction between ozone and DEP was negligible. Observing the pseudo first-order rate of DEP removal in ozone alone and ozone/UV processes, the different pattern was obtained from two processes. The ozone/UV process was well plotted following the pseudo first-order. but in the ozone alone process the rate was divided into fast and slow phases. DEP degradation characteristics in ozone alone and ozone/UV was also investigated by observing the HPLC spectrum. We detected unknown compounds that were guessed to DEP byproducts and observed the formation and disappearance of the unknown compounds according to reaction time. Observing of high removal of TOC in ozone/UV combined process, it was found that DEP and DEP byproducts are completely oxidized by ozone/UV combined process.

• Journal of Korean Society of Environmental Engineers
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• v.34 no.2
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• pp.73-78
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• 2012

In this study, three different synthetic musk compounds (SMCs) in the Nakdong river water (raw water) and rapid sand filtered water were treated by $O_3$ process. The experimental results showed that the removal efficiency of musk ketone (MK) was lower than removal efficiency of AHTN (7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-tetrahydronaphthalene) and HHCB (1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[c]-2-benzopyran) for both the raw water and the rapid sand filtered water. And in general, the removal efficiencies of three SMCs in the raw water were lower than that in the sand filtered water. Under the $O_3$ dose of 0.5~10.0 mg/L, the removal rate constants (k) of three SMCs for the raw and sand filtered waters increased rapidly with the increased $O_3$ dose. In the case of drinking water treatment plants (DWTPs) which were selected pre- and post-$O_3$ processes (located in the downstream of Nakdong River), operation conditions of pre- and post-$O_3$ process were $0.5{\sim}2.0mg{\cdot}O_3/L$ (2~4 min) and $0.5{\sim}2.5mg{\cdot}O_3/L$ (6~8 min). Therefore, $O_3$ doses and contact times of same conditions with above were very difficult to remove SMCs in DWTPs.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.381-382
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• 2003

오존은 여러 가지 산업적 응용분야를 가지고 있으며 특히, 광범위한 환경공학적 응용분야를 가지고 있다. 오존생성을 위해 개발된 무성방전 공정이 비교적 최근부터 악취 및 VOC를 포함한 대기오염 물질의 제거를 위해 활용되어오고 있으며 이러한 공정내에서 오존의 발생은 공정내의 오염물질 제거에 중요한 역할을 하게 된다. 따라서, 본 연구에서는 무성방전 공정에서 유입기체의 조성이 오존발생에 미치는 영향에 관해 알아보고자 하였다 (중략)

• Journal of Korean Society of Environmental Engineers
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• v.28 no.12
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• pp.1323-1330
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• 2006

In this study, five different odor causing compounds in the Nakdong river and rapid sand filtered waters were treated by oxidation from $O_3/H_2O_2$ process. In addition, the change in BDOC formation by the $O_3/H_2O_2$ process was also investigated for considering this advanced oxidation Process as a pre-treatment to the BAC treatment process. The experimental result showed that the removal efficiency of geosmin was higher with the use of 5 mg/L of $O_3$ and 0.2 mg/L of $H_2O_2$ than with the use of 20 mg/L of $O_3$ alone for the sand filtered water. And in general, the removal efficiency of geosmin in raw water was $12{\sim}27%$ lower than the one in sand filtered water. In sand filtered water. the removal efficiencies of geosmin and IPMP decreased when $H_2O_2/O_3$ ratio increases above the optimum ratio. The optimum ratio of $H_2O_2/O_3$ dose was $0.5{\sim}1.0$ for geosmin and $0.2{\sim}1.0$ for IPMP. However, the optimum ratio of $H_2O_2/O_3$ in raw water remove geosmin appealed to $1.0{\sim}3.0$. According to the experimental results for the removal of 5 different odor causing compounds under varied $O_3$ doses, the removal efficiency of IPMP was the highest with 60% and, in overall, $O_3/H_2O_2$ process showed higher removal efficiency than $O_3$ alone process. The BDOC formation by the $O_3/H_2O_2$ process increased from $0.1{\sim}0.25$ to $0.19{\sim}0.34$ comparing to $O_3$ process alone. Therefore, it is concluded that the advanced oxidation process with $O_3/H_2O_2$ can be used as a pretreatment to the BAC treatment process.

• Proceedings of the Korean Sanitation Conference
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• 2004.11a
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• pp.8-27
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• 2004

In this study, the sanitization effects of ozone and UV against pathogens and ticks were studied. The results indicate that in environments mimicking that of households, the number of pathogens was reduced by $99.0\%$ and $99.0\%$ by ozone and UV light, respectively. In addition, virus counts were also reduced by $100\%$. Optimization of experimental parameters showed that, under appropriate application, ticks are also eradicated by ozone and UV light. The ticks were divided into two groups, with the first group being treated with ozone only and the latter with ozone and UV light. The results from these experiments showed that, although ozone alone reduces the vitality of the ticks, the survival rate of the ticks was significantly more reduced when the ticks were exposed simultaneously to ozone and UV.