學校周邊騷音에 대한 學生意識構造 조사 : 대구지역 고등학교 2학년을 대상으로

금경호,김복련,서양곤 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-

The purpose of this study was to investigate the students' consciousness against noise around nine high schools in Taegu City. It was carried out to make up and analyze a question of noise. The results are summarized as follows : 1. Two schools whose Leq was below 50㏈(A) showed comparatively little noise pollution from noise measurement of schools. Four schools, though their Leq was a little more than 50㏈(A), were supposed to have little complaint about noise because their TNI value was less than 50. Three schools was estimated to have extreme discontentment about noise because their Leq was more than 60㏈(A), so exceeded environmental standard value(50㏈(A)) and their TNI exceeded 70. 2. In questionaire, 61.2% of respondents answered that noise around school was very severe. The main sources of noise were street traffic(45.7%). In season the noise of summer was most severe(81.0%) The responsibility of noise was given to school(21.0%) and community(30.1%). The questionaire showed that damage to study was 56.2% in class, 24.8% in examination. The response to noise during class showed that most students studied bearing noise but 12.3% students gave up studying. About physical damage, 10% students answered 'a little severe' or 'severe', so physical damage was not serious. About mental damage, 30% students-answered 'a little severe' or 'severe', so three times large as the physical damage. As the result, today noise around school in Daegu cause great damage to students in school life, especially study and its psychological effect. Therefore, to live in a good sound environment the study of counterplans to noise around school must be continued.

킬레이트 수지에 의한 Mo(Ⅵ)과 W(Ⅵ)의 분리 및 흡착

김복련,안주현,서양곤 경상대학교 환경보전연구소 1999 環境保全硏究所報 Vol.7 No.-

Three kinds of chelate resins bearing iminodiacetic acid, diethanolamine or diethylenetriamine have been applied to selectively separate and recover one component in a mixture of heavy metals, Mo and W, where their chemical properties are very similar. The adsorption behavior of metal ions was investigated for each chelate resin under various experimental conditions such as time, pH, metal ion concentration by a batch experiment. The chelate resins complexed by Mo or W were characterized by FTIR and ¹H NMR. The metal uptake of each chelate resin decreased with increasing pH. The resins were found to selectively chelate MoO₄^2- over a pH range of 2∼6. The chelate resin with diethanolamine groups showed the maximum adsorption capacity for Mo and W over a pH range of 1∼6 among three resins used. However, the resin with iminodiacetic acid groups showed the best results to separate Mo and W selectively. The ¹H NMR study using the homogeneous analogue suggests the higher selectivity of iminodiacetic acid group toward Mo over W.

환경에서의 오존이용 전망

김병호,금경호,서양곤 경상대학교 환경보전연구소 2001 環境保全硏究所報 Vol.9 No.-

Ozone was first used to disinfect water supplies in France in the early 1900s. Its use increased and eventually spread into several Western European countries. Today nearly 1,000 ozone disinfection installations exist (primarily in Europe), almost entirely for treating water supplies. A common use for ozone at these installations is to control taste-producing, odor-producing and color-producing agents. Ozone can also be used in wastewater treatment for odor control and in advanced wastewater treatment for the removal of soluble refractory organics, in lieu of the carbon-adsorption process. Ozone is also very effective virucide and is generally believed to be more effective than chlorine. Ozonation does not produce dissolved solids and is not affected by the ammonium ion or pH influent to the process. For these reasons, ozonation is considered a alternative to either chlorination of hypochlorination, especially where dechlorination may be required.

나노 기공의 탄소 멤브레인에서 기체의 선택적 분리를 위한 Monte Carlo 모사

이호수,금경호,서양곤 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-

The object of this study is to separate hydrocarbon selectively using MC method and carbon membrane. 12-6 Lennard-Jones potential function was used to describe reciprocal action of gas molecules. 10-4-3 potential function suggested by steele was used to calculate reciprocal action of molecules and pore walls. The membrane pore is composed of slit-like pores. it is include high-pressure region(H-region). low-pressure region(L-region) and M-region. between H-region and L-region. In the membrane. the transport of molecules with small size were high when the pore size is small. but in the case of molecules with large size were opposite to the transport of molecules with small size. we have found that the diffusion through surface effected on molecules transport by discussion of snapshots and density profiles. So. if the control of the pore size and surface diffusion were used to obtain high selectivity. it will be very useful method to improve the energy efficiency.

메탄과 에탄의 흡착평형에 대한 활성탄의 기공 크기 분포의 영향

김대규,금경호,서양곤 경상대학교 환경보전연구소 2000 環境保全硏究所報 Vol.8 No.-

The adsorption equilibria of methane and ethane in a slit pore model of activated carbon were studied by using Monte Carlo method. In potential caculation. the fluid-fluid interactions are described using the "12-6" Lennard-Jones potential function. and fluid-pore surface interactions are described using the "10-4-3" potential function proposed by Steele. It showed that the pore size distributions effected isotherms from the simulation results in pure component adsorption of methane and ethane at 1∼30 bar pressure. Also adsorbed moleculars could identified occuping location and density from density profiles and snapshots.

제올라이트(NaA형, NaX형)의 이온교환성에 관한 연구

정순희,김복련,금경호,서양곤,안주현 경상대학교 환경보전연구소 2001 環境保全硏究所報 Vol.9 No.-

A study has been made of the exchange of Ag^+, Li^+, and Ba^++, Ca^++, Sr^++ ion by using synthetic zeolite-13X and zeolite-NaA. The zeolite used in this work was supplied as beads by Aldrich Chemical Company, Inc., and the formula of unit cell is M_x/n[AlO₂)_x(SiO₂)_y]zH₂O. X-ray diffraction analysis and Fourier transform infrared spectroscopy indicated that the crystallinity of zeolites was retained though sodium ion in zeolite exchanged with the cation. The amount of ion exchanged was measured by the determining of the amount of cation remained in solution by Inductively coupled plasma, and surface area, adsorption isotherm, Ion exchange kinetics. The selectivity of ions was in the order Ag^+>Li^+>Sr^++>Ca^++>Ba^++.

The Korean Journal of Chemical Engineering 게재 논문 요약 : Mass Transfer in a Stirred Transfer Cell with a Flat Interface

Yang Gon Seo,Sang Bo Park,Won Kook Lee 한국화학공학회 1988 NICE Vol.6 No.1

N/A A agitated vessel of Lewis cell type was used to investigate the effect of physical properties on the mass transfer coefficient for partially miscible binary systems. Some measurements were performed with ternary systems transferring only one solute across two immiscible solvents. The mass transfer coefficients were measured under the conventional contra-rotating conditions which were behaved as if the interface was not rotating for some combinations of agitation speeds in each of the two phases. The mass transfer coefficient was deduced from solving a steady-state two dimensional convective-diffusion equation with the assumption of sinusoidal motion of eddies. Owing to the complexity of the hydrodynamic conditions near the liquid-liquid interface, theoretical approach was impossible. Thus, the effects of forced turbulence and physical properties on the effective surface renewal time were experimentally investigated. The relation between the mass transfer coefficients and the relevant variables was obtained by conventional dimensional analysis as follows: (수식)

EDDY CHARACTERISTICS ON MASS TRANSFER CLOSE TO FREE INTERFACE

Seo, Yang Gon,Lee, Won Kook 한국화학공학회 1988 Korean Journal of Chemical Engineering Vol.5 No.2

폐타이어 열분해에 의한 카본블랙을 이용한 황화수소와 암모니아 제거를 위한 흡착제 개발

서양곤(Yang-Gon Seo),김창준(Chang-Joon Kim),김대혁(Dae Hyeok Kim) 한국청정기술학회 2015 청정기술 Vol.21 No.2

황화수소와 암모니아는 많은 하수처리장과 산업 플랜트로부터의 배출가스에서 발견되어질 수 있는 가장 흔한 악취성분이다. 이들 유해물질들은 인간에게 건강 문제를 일으키고 촉매에 악영향을 미치기 때문에 생활환경과 산업 현장에서의 제거는 매우 중요하다. 본 연구에서는 황화수소와 암모니아에 대한 우수한 흡착능력을 가지는 흡착제를 개발하기 위하여 폐타이어의 열분해 생성물인 카본블랙을 이용하였다. 카본블랙, 금속산화물과 산 또는 염기를 혼합하여 펠렛형 흡착제를 제조하였고, 상온상압에서 고정층 흡착탑의 파과곡선을 이용하여 황화수소와 암모니아에 대한 흡착성능을 평가하였다. 카본블랙, 산화철(III)과 수산화나트륨 혼합물로 제조된 흡착제가 황화수소에 대한 가장 우수한 작업능력을 나타내었다. 암모니아에 대해서는 카본블랙, 산화구리(II), 염산의 혼합물로 제조된 흡착제가 우수한 작업능력을 보였다. Hydrogen sulfide and ammonia are one of the common malodorous compounds that can be found in emissions from many sewages treatment plants and industrial plants. Therefore, removing these harmful gases from emissions is of significance in both life and industry because they can cause health problems to human and detrimental effects on the catalysts. In this work, pyrolytic carbon blacks from waste tires were used to develop adsorbent with good adsorption capacity for removal of hydrogen and ammonia. Pellet-type adsorbents were prepared by a mixture of carbon black, metal oxide and sodium hydroxide or hydrochloric acid, and their adsorption capacities were estimated by using breakthrough curve of a continuous fixed bed adsorption column at ambient condition. The adsorbent manufactured with a mixture of carbon black, iron oxide(III) and sodium hydroxide showed the maximum working capacity of hydrogen sulfide. For ammonia, maximum working capacity was obtained by the adsorbent manufactured with a mixture of carbon black, copper oxide(II) and hydrochloric acid.

수용액으로부터 질산성질소 제거를 위한 기술

서양곤(Yang Gon Seo),정세영(Se Yeong Jung) 한국청정기술학회 2017 청정기술 Vol.23 No.1

높은 농도의 질산염을 포함하는 물은 인간의 건강을 위협하고 부영양화의 원인이 되기 때문에 제한 농도 이하로 처리되어야 한다. 그러나 질산염은 수용액에서의 높은 용해도로 인해 응집, 여과 및 침전과 같은 일반적인 처리공정으로는 제거가 거의 불가능하다. 따라서 흡착, 이온교환, 역삼투, 탈질과 전기투석과 같은 다른 기술이 질산염의 효과적인 제거를 위해 요구된다. 이들 각 기술은 비용, 수질 개선 정도, 잔류물 처리와 전처리 요구와 같은 인자의 비중에 따라 장점과 단점과 가능성을 가지고 있다. 흡착은 가격 효율성, 운전의 용이성과 설계의 간편성으로 가장 보편적으로 사용되는 공정이다. 흡착제의 표면개질은 질산이온 흡착능력을 개선하였다. 역전 전기투석과 역삼투의 질산-선택 멤브레인 공정은 수용액 중의 질산이온 제거에 오랜동안 많은 지역에서 효과적임이 증명되었다. 두 기술은 높은 농도의 폐기물을 생성하고 이것의 신중한 처분이 필요하다. At high nitrate concentrations, water must be treated to meet regulated concentrations because it results in threat to human health and eutrophication of natural water. However, it is almost impossible to remove nitrate by conventional water treatment methods such as coagulation, filtration and precipitation, due to its high water solubility. Therefore, other technologies including adsorption, ion exchange, reverse osmosis, denitrification, and electrodialysis are required to effectively remove nitrate. Each of these technologies has their own strengths and drawbacks and their feasibility is weighted against factors such as cost, water quality improvement, residuals handling, and pre-treatment requirements. An adsorption technique is the most popular and common process because of its cost effectiveness, ease of operation, and simplicity of design. Surface modifications of adsorbents have been enhanced their adsorption of nitrate. The nitrate-selective membrane process of electrodialysis reversal and reverse osmosis have proven over time and at many locations to be highly effective in removing nitrate contaminating problems in aqueous solutions. Both electrodiaysis and reverse osmosis methods generate highly concentrated wastes and need careful consideration with respect to disposal.