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초음파(화학적)처리 공정을 이용한 염색폐수처리에 관한 연구
유영억 한국환경보건학회 2003 한국환경보건학회지 Vol.29 No.5
This study was carried out to investigate the treatment efficiency of textile wastewater by the sonication. Textile wastewater was exposed to 200kHz ultrasounds with a power of 6.0W/cm2 per unit volume in a sonochemical reactor under ambient temperature and pressure condition. TOC, CODMn, BOD5, N-NH4, color of textile wastewater were decreased with irradiation of ultrasounds. After sonication for 60 minutes, the removal efficiency was observed that TOC, CODMn, BOD5, N-NH4 and color of treated textile wastewater under the condition were reduced to 58%, 41%, 52%, 11% and 50%, respectively.
Effects of Acid Deposition on Cultural Properties and Materials in East Asia
유영억,야수아끼, 마에다 대구대학교 환경기술연구소 2005 미래환경기술 Vol.1 No.2
The material exposure experiments have been carried out to evaluate the relationship between air pollution and material corrosion rate with the cooperation of the researchers in Japan, China, Korea since 1993. The test materials such as bronze, copper, marble, carbon steel, and urushi have been exposed under outdoor and indoor conditions at 23 sampling sites in East Asia. At the same time and places, the concentration of SO₂ and NO₂has been measured simultaneously with the passive sampler. Qualitative and quantitative atmospheric corrosion was estimated from the damage caused to bronze, copper, steel, marble, cedar, cypress and urushi (Japanese lacquer) plates, exposed to outdoor and indoor airs in some cities of East Asia. Brochantite and cuprite were formed on copper at sites where the sulfur dioxide concentrations were high, and basic cupric nitrate and cuprite at sites where nitrogen dioxide concentrations were high. Gypsum was formed on marble pieces exposed to indoor air at all sites but was not found on the pieces exposed to outdoor air. Goethite, lepidocrocite, hematite and magnetite were formed on the steel plates. However, no akaganeite, formed in chloric atmosphere, was observed on the plates. The effects of atmosphericand meteorological factors on the damage to copper plates and marble pieces in several cities in East Asia were estimated using regression analysis. The results indicate that sulfur dioxide is the most destructive of materials especially in China and South Korea. In Japan copper plates may be damaged under natural conditions and by sea salt. Copper may also be damaged by surface deposition of sulfur and chlorine. Marble may be substantially degraded by gaseous sulfur dioxide but sulfate ions in rain had no effect. The analysis of air pollution from the point of view of material damage was very useful in evaluating and visualizing the intensity of air pollution in East Asia.
유영억 ( Young Eok Yoo ),김동석 ( Dong Seog Kim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
The aim of this research was to evaluate the performance of insoluble electrode for the purpose of degradation of Rhodamine B (RhB) and oxidants generation [N,N-Dimethyl-4-nitrosoaniline (RNO, indicator of OH radical), O3, H2O2, free Cl, ClO2)]. Methods: Four kinds of electrodes were used for comparison: DSA (dimensional stable anode; Pt and JP202 electrode), Pb and boron doping diamond (BDD) electrode. The effect of applied current (0.5~2.5 A), electrolyte type (NaCl, KCl and Na2SO4) and electrolyte concentration (0.5~3.5 g/L) on the RNO degradation were evaluated. Experimental results showed that the order of RhB removal efficiency lie in: JP202 > Pb > BDD ≒> Pt. However, when concerned the electric power on maintaining current of 1 A during electrolysis reaction, the order of RhB removal efficiency was changed: JP202 > Pt ≒ Pb > BDD. The total generated oxidants (H2O2, O3, free Cl, ClO2) concentration of 4 electrodes was Pt (6.04 mg/W) > JP202 (4.81 mg/W) > Pb (3.61 mg/W) > BDD (1.54 mg/W), respectively. JP202 electrode was the best electrode among 4 electrodes from the point of view of performance and energy consumption. Regardless of the type of electrode, RNO removal of NaCl and KCl (chlorine type electrolyte) were higher than that of the Na2SO4 (sulfuric type electrolyte) RNO removal. Except BDD electrode, RhB degradation and creation tendency of oxidants such as H2O2, O3, free Cl and ClO2, found that do not match. RNO degradation tendency were considered a simple way to decide the method which is simple it will be able to determinate the electrode where the organic matter decomposition performance is superior. As the added NaCl concentration was increases, the of hydrogen peroxide and ozone concentration increases, and this was thought to increase the quantity of OH radical.
일본에서의 지속가능 발전교육(ESD)에 관한 교사, 대학생 및 학부모의 인식에 관한 연구
유영억(Young-Eok Yoo) 한국환경교육학회 2010 環境 敎育 Vol.23 No.3
This study conducted a survey on recognition of teachers, students, and Parent Teacher Association(PTA) for the Education for Sustainable Development from April to October, 2008. It confirmed a couple of facts, which were summarized as follows; First, among eight educational areas including Environmental Education, Energy Education, Gender Education, World Heritage Education, Multi-cultural Coexistence Education, Peace Education, Education for human rights, and Education for international understanding that UNESCO had offered, this study showed that the 'Environmental Education' is a relatively important area comparing with others. Second, 54.4% of the respondents have agree with the need of the education for sustainable development in the middle school and the high school, and 54.1% of them showed their willingness to participate in the program. Third, because 49.2% of the respondents chose 'important' on the question of 'how important the field education and the experience education are', it looked like most of them agreed with the importance of the field education and the experience education. Fourth, because 61.1% of the responded teachers chose 'need' on the question of 'if it needs relationship with other studies', it looked like most of them agreed with the necessity of relationship with other studies. Fifth, 62.5% of the respondents chose 'no' on the question of 'if they conduct the education for sustainable development'. Even if some wanted the education for sustainable development, most of them would not do it in the regular curriculum, but in the special activity class or teacher’s discretional time. Sixth, most respondents indicated the teacher’s class burden and the teacher’s lack of knowledge as the problem if the education for sustainable development would be conducted. This result implied that in order to vitalize the education for sustainable development, the teacher’s class burden should be reduced and the teacher train program is necessary. Finally, urgent requested studies could improve the education for sustainable development in communities and schools, because the result of the survey showed education, natural observation learning, and visiting ecological parks as important elements.