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UV/H<sub>2</sub>O<sub>2</sub>를 이용한 2,4-DCP의 산화에 NO<sub>3</sub><sup>-</sup> 이온이 미치는 영향
박재한,이지영,안윤희,문태훈,임성균,고광백,Park, Jae Han,Lee, Ji Yong,Ahn, Yoon Hee,Moon, Tae Hoon,Yim, Sung Kyun,Ko, Kwang Baik 한국물환경학회 2007 한국물환경학회지 Vol.23 No.3
The Advanced Oxidation Process (AOP) is being increasingly used to oxidize complex organic constituents in treated effluents from domestic wastewater treatment plants. Generally, ${NO_3}^--N$ concentrations ranges between 5 and 8 mg/L for biologically well-treated effluents. However, nitrate ions, ${NO_3}^-$, affects on oxidation as not only a well-known strong absorber of UV light below 250 nm of wavelength but also as an OH radical scavenger. The objective of this study was to evaluate the AOP systems for degradation of 2,4-DCP, and to delineate the effect of nitrate ions on UV oxidation of 2,4-DCP by conducting a bench-scale operation at various reaction times and initial concentrations of $H_2O_2$. The experimental results indicated that 2,4-DCP could be completely oxidized by $UV/H_2O_2$ process with an initial $H_2O_2$ concentration of 20 mg/L at a retention time of 1.0 min or longer. Nitrate ions did not show any adverse effect on 2,4-DCP oxidation at this high $H_2O_2$ concentration, and the practical initial $H_2O_2$ concentration and reaction time for the 80% oxidation turned out to be 5 mg/L and 1.0 min, respectively.
김세열(Seyul Kim),주정균(Jeong-kyun Ju),안윤희(Yoon-Hee Ahn),연건흠(Geon-heum Yeon) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
의복의 신축성은 착용 쾌적 성능의 중요한 요인이 되고 있어, 섬유 시장에서는 신축성을 극대화한 고기능성 섬유소재의 수요가 증가하고 있는 실정이다. 고신축성 섬유소재에 부여되는 기능성 수준은 원사의 종류, 섬유조성, 섬유조직 및 제직방법 등에 따라 달라질 수 있고, 이러한 조건에 따라 다양한 기능성 섬유들이 개발되고 섬유의 신축성에 대한 객관적인 평가방법이 요구되고 있다. 실제로 단축 방향으로는 섬유의 신장특성을 평가할 수 있는 방법들이 이미 개발되어 있지만, 이는 기능성 섬유가 의복으로 제작되어 착용했을 때에 대한 다축 스트레스를 고려할 수 없는 방법이므로 실제 사용 환경에서의 신장특성을 평가할 수 있는 방법이라고 볼 수 없다. 따라서 이를 객관적으로 평가할 수 있는 시험법의 개발이 요구된다. 본 연구에서는 실제 사용 환경과 같은 조건에서 이축 방향에 대한 섬유소재의 신장특성을 객관적으로 평가하기 위하여 이축인장시험기를 활용한 이축신장특성 시험법을 개발하고자 한다. 시험법 설계에 앞서 섬유소재의 신장특성 평가의 최적화된 결과를 도출하기 위하여 시험편의 모양 및 사이즈에 대한 비교평가를 진행하였다. 앞서 도출된 시험편의 형태를 적용하여 이축인장시험장비의 시험조건을 설정하게 되는데 이 때 고려될 인자는 시험편을 고정시킬 jaw size, 클램프가 양쪽으로 움직이는 속도, gauge length 등이 있다. 다양한 조건의 평가결과를 통해 최적화된 이축신장특성 시험조건을 사용하여 반복횟수를 늘려가며, 2 종 이상의 기능성 섬유 원단에 대한 탄성 회복률 및 영구 변형률 평가를 진행하고 그 결과를 비교하였다. The elongation property of functional clothing such as sportswear is the most important factor in wearing comfort performance as a result the demand for high-functional textile materials that maximized elongation property is increasing in the textile market. Since the elasticity level of elastic fiber materials is depending on the type of yarn, fiber composition, fabric structure and weaving method, various functional fibers are being developed considering these conditions. Thus a test method that able to test the elongation property of the high-functional textile materials objectively is required. A method for testing the elongation properties of fibers in the uniaxial direction has already been developed, but this is not a method that takes into account the multi-axial stress condition in actual usage environment. So, it cannot be seen as a method for testing the elongation properties in actual usage environment. Therefore, it is necessary to develop a test method that can objectively evaluate it. In this study, in order to objectively test the elongation properties of fiber materials in the biaxial direction under the same conditions as the actual usage environment, a biaxial elongation test method using a biaxial tensile tester is developed. Prior to designing the test method, a comparative test according to shape and size of the specimens was conducted in order to determine the appropriate specimen shape for biaxial elongation test of the fiber material. The condition of biaxial elongation test was optimized by considering the jaw size, the extension speed in both directions, and the gauge length and using the shape of the previously determined test specimens. Also, the recovered elongation and permanent deformation properties were tested according to the number of repeat cycles under the optimized biaxial elongation test conditions, and then the test results were compared respectively.
하수처리수 재이용을 위하여 Sym-bio공정과 용존 오존 부상공정을 이용한 하수처리의 효율 분석
박찬규 ( Chan Gyu Park ),박재한 ( Jae Han Park ),이경희 ( Kyung Hee Lee ),안윤희 ( Yoon Hee Ahn ),고광백 ( Kwang Baik Ko ),정현철 ( Hyun Cheol Jung ) 한국물환경학회 2008 한국물환경학회지 Vol.24 No.1
Water reuse of effluent is limited, due to bacteria and chromaticity or turbidity which may result in low perception of water quality. Consequently, this study showed a method in the reuse of treated wastewater by a diversified treatment method, with separation of centralized reformation of aeration tank into pre-treatment with minimum installation of facilities, and post-treatment, applying advanced oxidation treatment. A pilot plant experiment was performed using Sym-Bio process adopting an NADH Sensor without modification of the exiting aeration tank. The Dissolved Ozone Flotation process, which is an advanced oxidation process, to treat the remaining organics, nutrients, chromaticity, turbidity and bacteria. As a result in the Sym-Bio process, the biological treatment, even on the condition of single stage reaction tank, the treatment efficiencies of BOD, CODMn, CODCr, SS and T-N were 96.6%, 84.6%, 88.25%, 95.1% and 71.0%, respectively, while that for T-P was 25.0%, which required further treatment. In the Dissolved Ozone Flotation process, the advanced oxidation treatment, the treatment efficiencies of BOD, CODMn, CODCr, SS, T-N, T-P, chromaticity, turbidity, bacteria, coliforms were 78.9%, 34.6%, 28.7%, 48.0%, 70.4%, 82.4%, 84.0%, 74.5%, 99.8% and 99.4%, respectively.