• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.118-118
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• 2012

현재 정부는 친환경녹색성장을 모티브로 환경기준을 강화하고 있으며, 오염 발생원을 최소화 하고자 현재 가동중인 환경기초시설을 대상으로 고도산화공정을 추가하여 오염 배출량을 최소화 하도록 정부와 지자체가 독려하고 있는 중이다. 따라서 대표적인 환경오염 업종인 섬유/염색 관련업체는 강화되는 환경기준을 만족하기 위한 공정검토가 불가피한 현실이다. 특히 대구 OO염색공단은 염색업체가 집적되어 있어 난분해성 오염물질과 색도유발물질이 다량 발생되고 있으며, 폐수처리장에서 운영 중인 재래식 폐수처리공정으로는 강화되는 방류수 수질기준을 충족할 수 없다. 따라서 본 연구에서는 방류수 수질기준을 만족하기 위한 고도산화 공정을 검토하였으며, 그 공정의 최적인자를 도출하고자 하였다. 고도산화 공정에서 오존산화, Peroxone AOP, Fenton oxidation 공정을 검토하였으며, 강화되는 수질기준을 만족할 수 있는 최적인자 및 처리효율을 검토하였다. 그 결과 조건에 따라 COD, T-N, T-P, 색도 등에서 처리효율은 40 ~ 90% 범위로 경제성을 고려하여 최적의 운전조건을 도출 하였다.

• Journal of Korean Society of Water and Wastewater
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• v.32 no.2
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• pp.159-168
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• 2018

Climate change is believed to increase the amount of dissolved organic matter in surface water, as a result of the release of bulk organic matter, which make difficult to achieve a high quality of drinking water via conventional water treatment techniques. Therefore, the natural water treatment techniques, such as managed aquifer recharge (MAR), can be proposed as a alternative method to improve water quality greatly. Removal of bulk organic matter using managed aquifer recharge system is mainly achieved by biodegradation. Biodegradable dissolved organic carbon (BDOC) and assimilable organic carbon (AOC) can be used as water quality indicators for biological stability of drinking water. In this study, we compared the change of BDOC and AOC with respect to pretreatment methods (i.e., ozone or peroxone). The oxidative pretreatment can transform the recalcitrant organic matter into readily biodegradable one (i.e., BDOC and AOC). We also investigated the differences of organic matter characteristics between BDOC and AOC. We observed the decreases in dissolved organic carbon (DOC) and the tryptophan-like fluorescence intensities. Liquid chromatographic - organic carbon detection (LC-OCD) analysis also showed the reduction of the low molecular weight (LMW) fraction (15% removed, less than 500 Da), which is known to be easily biodegradable, and the biopolymers, high molecular weight fractions (66%). Therefore, BDOC consists of a broad range of organic matter characteristics with respect to molecular weight. In AOC, low molecular weight organic matter and biopolymers fraction was reduced by 11 and 6%, respectively. It confirmed that biodegradation by microorganisms as the main removal mechanism in AOC, while BDOC has biodegradation by microorganism as well as the sorption effects from the sand. $O_3$ and $O_3+H_2O_2$ were compared with respect to biological stability and dissolved organic matter characteristics. BDOC and AOC were determined to be about 1.9 times for $O_3$ and about 1.4 times for $O_3+H_2O_2$. It was confirmed that $O_3$ enhanced the biodegradability by increasing LMW dissolved organic matter.

• Analytical Science and Technology
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• v.13 no.5
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• pp.659-665
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• 2000

The changes in $UV_{254}$ and concentrations of $H_2O_2$ formed by ozonation of aqueous humic acid in ozone/high pH, peroxone process and in the presence of radical scavenger, $HCO_3{^-}$ were investigated. This study confirmed that the formation of $H_2O_2$ by ozonation may undergo different reaction pathways compared to those of $UV_{254}$ reduction in the degradation of the humic acid. The concentration of $H_2O_2$ produced by ozonation was found to be increased with decreasing pH of the sample solution due to the higher stability of ozone molecules at acidic conditions. On the while, $UV_{254}$ reduction was found to be higher at alkaline conditions or larger amount of $H_2O_2$ additions as a radical promoter in which the producing of ${\cdot}OH$, ${\cdot}HO_2$ radicals can be more favorable. From the results, it has been suggested that the formation of $H_2O_2$ by ozonation depends mainly on the direct reactions of ozone with humic acid molecules, while $UV_{254}$ reduction is affected by both the indirect reactions of the radicals and direct reactions of ozone with humic acid.