• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2015년도 학술발표회
• /
• pp.283-283
• /
• 2015

1,4-dioxane은 페인트, 광택제 및 코팅제의 제조시에 첨가되는 화학물질로 인간에 대한 발암 가능성과 수중에서의 지속성으로 인해 EPA priority pollutant로 지정되어 있다. 이에 최근 고도산화법을 이용한 처리가 계속적으로 연구되고 있으며, UV/$H_2O_2$ 공법을 통하여 수계에서 발견되는 난분해성 유기 오염물의 제거가 효과적인 것으로 밝혀졌다. 하지만 고도산화공정(AOP)은 다량의 에너지 소모와 산화제 투여로 인한 높은 운전비용이 현실적인 적용에 장애가 되고 있다. 한편 상대적으로 저렴한 비용으로 1,4-dioxane을 처리할 수 있다는 장점으로 인하여 생물학적 분해에 대한 많은 연구가 진행되어 왔다. 하지만, 1,4-dioxane에 대한 많은 연구들이 주로 분해미생물의 분리동정 및 회분식 분해특성에 대한 연구들 위주로 보다 실질적인 연속적 처리반응조의 운전결과들은 거의보고 되지 않고 있다. 본 연구는 Lab scale 연속처리반응조의 장기운전 후 pilot plant 현장적용에 앞서 인공폐수와 합성폐수에서의 분해효율 비교 회분식 실험을 통해 합성폐수내 생물학적 분해에 영향을 미치는 inhibitor의 영향을 확인하였으며, 미생물의 배양 조건에 따른 분해효율 비교 회분식 실험과 modeling을 통하여 현장운영 효율을 예측하였다. 이를 반영하여 추후 진행예정인 pilot plant의 현장 적용성 검토 및 최적 설계인자 도출, 장기운전에서의 효율성 증대를 목적으로 한다.

• 한국환경보건학회:학술대회논문집
• /
• 한국환경보건학회 2005년도 국제학술대회
• /
• pp.351-354
• /
• 2005

The removal of 1,4-dioxane and the biodegradability enhancement of dioxane contaminated water was investigated using $O_3-H_2O_2$ based advanced oxidation process. Experiments were conducted using a bubble column reactor under different dioxane and peroxide concentrations as well as PH. The $O_3-H_2O_2$ process effectively converted dioxane to more biodegradable intermediates and increased the biodegradability and average oxidation state of dioxane in the solution.

• 청정기술
• /
• 제22권4호
• /
• pp.281-285
• /
• 2016

난분해성 1,4-다이옥산을 분해시키기 위하여 촉매습식과산화반응에 활성적인 Cu wire촉매를 사용하였다. Cu wire 촉매를 사용함으로써 1,4-다이옥산의 완전한 분해가 가능하였으나, 분해된 1,4-다이옥산은 완전 무기화($CO_2$와 $H_2O$로 전환)되지 못하고 중간생성물인 ethylene glycol diformate, oxalic acid, formic acid, formaldehyde, acetaldehyde 등으로 전환되었다. 1,4-다이옥산이 분해되어 없어짐에 따라 formaldehyde와 oxalic acid가 점진적으로 나타나기 시작하여 증가하다가 최고농도를 보인 후 다시 감소하였다. 이들 두 중간체의 최고농도 도달시점에 acetaldehyde의 농도가 급격히 증가하여 최고농도를 보인 후 다시 감소하였다. 이들 세가지 중간물질의 감소와 함께 ethylene glycol diformate, formic acid가 생성되기 시작하여 그 농도가 점진적으로 증가하였다. 이들은 연속적인 과정을 통해 생성되었다. Cu wire 촉매는 반응이 진행되는 동안 활성이 떨어지지 않고 매우 안정적이었다.

• Bulletin of the Korean Chemical Society
• /
• 제26권8호
• /
• pp.1229-1234
• /
• 2005

The conformational, configurtational behavior and the structure of N-2-(1,4-Dioxane)-N'-(4-methylbenzenesulfonyl)-O-(4-methylphenoxy) isourea 1 has been studied using DFT method. Calculations predict the imidoyl amino group of the dioxane ring prefers axial conformation and that the tosyl and tolyl groups about the C=N bond retain E configuration. The anomeric effect controls the population of dioxane ring conformers, and anomers. Intramolecular hydrogen bonds contribute to the stability of E isomers. The computational analysis of 1 complements the X-ray findings.

• 한국물환경학회지
• /
• 제29권6호
• /
• pp.842-846
• /
• 2013

In 2012, the Korean Ministry of Environment (MOE) added 3 new water quality standards for the protection of human health; specifically, regarding 1,4-dioxane, formaldehyde, and hexachlorobenzene. In this study, we assimilated the water quality standards of these 3 substances from other countries, with respect to surface water quality standards for human health protection and drinking water standards. We subsequently investigated how these standard values were derived. 1,4-Dioxane is managed as an environmental standard for human health in Japan, and as a drinking water quality standard in WHO, New Zealand, and Japan with respect to both carcinogenic and non-carcinogenic effects. In New York, the oncogenic effects of formaldehyde in drinking water intake is considered, whereas WHO, Australia, New Zealand, and Japan also assess the non-carcinogenic effects of formaldehyde when setting their standards. USEPA and New York have a water quality standard for human health protection with respect to hexachlorobenzene based on carcinogenic effects. This study focuses on deriving water quality standards for the 3 new substances, or obtaining baseline information to revise the values of existing substances in the future.

• 한국환경과학회지
• /
• 제20권7호
• /
• pp.811-818
• /
• 2011

Daphnia Magna Stratus has been widely accepted as useful species for estimating the toxicity of chemicals to aquatic invertebrate and recommended as species for the testing chemicals from the international guideline as well as Korean guideline. The study was performed for the acute toxicity test by using water flea(D. Magna) for effluents from several wastewater treatment plants and drainage canals in GyeongBuk area. Five heavy metals, 1,4-Dioxane and Perchlorate were tested. Most Toxicity Units(TU) of Industrial wastewater effluents were less than 1 which means effluent was not toxic to D. Magna. However, effluents containing 1,4-Dioxane and Perchlorate were significantly toxic to D. Magna. Therefore, facilities should reduce the 1,4-dioxane since new regulations will force them after the year of 2011.

• 한국환경보건학회:학술대회논문집
• /
• 한국환경보건학회 2005년도 가을학술대회
• /
• pp.143-146
• /
• 2005

O_$3/H_2O_2$를 이용하여 1,4-dioxane의 산화처리에 미치는 $H_2O_2$ 농도의 영향에 대하여 고찰하였다. 또한 1,4-dioxane의 생물학적 분해가능성도 파악하였다. 실험은 bubble column reactor를 이용하여 수행되었으며, 여러 pH 및 $H_2O_2$ 조건에서 수행되었다. $H_2O_2$ 농도가 40 - 120 mg/L 범위에서, 초기 $H_2O_2$ 농도가 높을수록 1,4-dioxane의 제거율 및 생물분해성도 증가하였다.

• 한국환경과학회지
• /
• 제17권3호
• /
• pp.343-350
• /
• 2008

The fate of two cyclic ethers, THF(Tetrahydrofuran) and 1,4-Dioxane, in conventional biological wastewater treatment plants was investigated using sequential activated sludge process. Removal efficiency of THF were about 86% in average, which was greater than that of 1,4-Dioxane, 30%. However, it was not clear whether the removal of cyclic ethers in biological system was caused by microbial activity or not. Thus treatability tests were conducted by batch experiments. The effects of mixing, aeration and the addition of activated sludge on the removal of cyclic ethers were investigated in batch experiments. THF was totally removed by mixing and aeration in 24 hours while removal ratio of 1,4-Dioxane was at most 30% for the same period. This results could be ascribed to the differences in Henry's law constants between the two chemicals. In addition, biological degradation including biosorption was not obviously observed in these batch tests.

• 대한화학회지
• /
• 제10권2호
• /
• pp.62-66
• /
• 1966

Chloral hydrate와 置換 benzene類의 縮合에 依한 殺蟲劑로는 1,1,1-trichloro-2,2-bis(p-chloro phenyl) ethane, 1,1,1-trichloro-2,2-bis(p-methoxy phenyl) ethane, 1,1-di chloro-2,2-bis(p-chloro phenyl) ethane 等 主로 bis compounds가 實用化되고 있다. 그러나 置換 phenol類에 있어서는 chloral hydrate의 mol 比를 높이면 dioxane型의 化合物이 生成되고 上記한 bis compounds처럼 殺蟲能을 가졌으리라고 豫測되므로 2,4,5-trichloro phenol과 chloral hydrate를 縮合하여 生成物의 構造를 檢討하였던바 5,6,8-trichloro-2,4-di-trichloro methyl-benzo-1,3-dioxane임을 確認하였으며 反應條件과 [귤응애] 및 [복숭아 흑진딧물]에 대한 殺蟲能을 檢討하였다.

• 한국환경과학회지
• /
• 제15권3호
• /
• pp.193-201
• /
• 2006

Advanced oxidation processes involving $O_3/H_2O_2$ and $O_3/catalyst$ were used to compare the degradability and the effect of pH on the oxidation of 1,4-dioxane, Oxidation processes were carried out in a bubble column reactor under different pH. Initial hydrogen peroxide concentration was 3.52 mM in $O_3/H_2O_2$ process and 115 g/L (0.65 wt.%) of activated carbon impregnated with palladium was packed in $O_3/catalyst$ column. 1,4-dioxane concentration was reduced steadily with reaction time in $O_3/H_2O_2$ oxidation process, however, in case of $O_3/catalyst$ process, about $50{\sim}75%$ of 1,4-dioxane was degraded only in 5 minutes after reaction. Overall reaction efficiency of $O_3/catalyst$ was also higher than that of $O_3/H_2O_2$ process. TOC and $COD_{cr}$ were analyzed in order to examine the oxidation characteristics with $O_3/H_2O_2\;and\;O_3/catalyst$ process. The results of $COD_{cr}$ removal efficiency and ${\Delta}TOC/{\Delta}ThOC$ ratio in $O_3/catalyst$ process gave that this process could more proceed the oxidation reaction than $O_3/H_2O_2$ oxidation process. Therefore, it was considered that $O_3/catalyst$ advanced oxidation process could be used as a effective oxidation process for removing non-degradable toxic organic materials.