부식산의 흡광도, COD, TOC, 분자크기분포 및 오존처리에 따른 특성변화

이동석,김명철 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-

This study investigates the characteristics of humic acid before and after ozonation. The results were compared in such terms as CODCr, CODMn, TOC(total organic carbon) and molecular size distribution. As a result of ozonation (with the dose of 3mgO3/mgHumic Acid), UV/VIS absorbance, CODCr, CODMn and TOC were decreased with similar tendency. The mole fraction fo high molecular size was rapidly decreased and the fraction ratio of low molecular size was increased through ozone treatment. This fact can be correlated with the change in the difference and the ratio of CODCr and CODMn (the value of CODCr-CODMn and CODMn/CODCr). From this result, it can be inferred that the molecular size and the degree of chemical oxidative degradation of humic acid after ozonation were changed.

TiO₂ 졸-겔 코팅 막에 의한 Humic Acid의 광분해 : 화학적 산화법에 의한 부식산의 분해처리 기술에 관한 연구(Ⅱ);Characterization of Humic Acid in the Chemical Oxidation Treatment (Ⅱ)

석상일,안복엽,서태수,이동석 江原大學校 附設 環境硏究所 2000 環境硏究 Vol.17 No.-

The degradation of humic acid using TiO₂ coatings studied. TiO₂ coatings were prepared by dip-coating method. Sol solutions for coating were prepared by mixing the gel, which can be produced by the reaction of TiOCl₂ and NH₁OH solution, and hydrogen peroxide solution, and hydrolysis of titanium tetraisopropoxide (TTIP). It was shown from SRD that coatings from sol aged at 100℃ for 18h with titanium peroxo solution were crystallized to anatase in the range of temperatures of 25℃ to 500℃. In contrast, those coated from TTIP were crystallized to anatase at temperature above 400℃. So the sols originated from TiCl₄ can be applied for not only on the heat-resistance substrates but on the plastic substrates. Thickness and the quality of the films were dependent on the withdrawing speed, the concentration of sol, and the number of coating. The films showed various interference colors depending on the thickness of them. In the case that the films coated 2 times at withdrawing speed of 2.5cm per minute by 0.2M sol, the films had a transparent light blue color with thickness of around 50nm. It was known from the result of photo-degradation by TiO₂ coatings using humic acid that the removal efficiency of COD_(cr) was over 85% after illumination of UV/H₂O₂ for 40min, and that of UV/VIS absorbable materials was over 95%. TiO₂코팅매체를 이용한 humid acid의 광분해 특성을 조사하였다. TiO₂코팅은 TiOCl₂ 수용액을 암모니아수로 침전시킨 겔을 과산화수소로 용해한 용액 혹은 졸이나 titanium tetraisopropoxide (TTIP)의 가수분해로부터 제조한 졸을 이용하여 dip-coating법으로 제조하였다. Titanium peroxo 용액을 열처리하여 제조한 졸을 이용한 코팅층은 X-선 회절 분석으로부터 25℃~500℃ 온도 범위에서 모두 anatase형 결정구조를 가지고 있었다. 반면에 TTIP의 가수분해로 생성된 졸로부터 만든 코팅막은 400℃ 이상에서 anatase의 결정형이 나타났다. 이로부터 titanium peroxo 용액을 열처리하여 제조한 졸은 내열성 및 비내열성 기판에도 결정성 TiO₂ 코팅층을 만들 수 있는 장점이 있다. 코팅막의 두께 및 균일성은 인출속도, 코팅졸의 농도 및 코팅 횟수에 영향을 받았으며, 코팅막의 두께에 따라 다양한 간접색상을 나타냈다. 0.2M 졸을 이용하여 인출속도 2.2cm/min로 2회 코팅했을 경우, 약 50nm 두께의 투명하면서도 균일한 흐린 남색을 띠는 TiO₂코팅막을 얻을 수 있었다. 이상의 방법으로 직경 0.3cm의 유리구슬에 TiO₂ 코팅막을 제조한 후 580cm³의 반응조를 사용하여 UV/H₂O₂ 공정으로 humic acid를 40분 동안 광반응시킨 결과, 초기 시료의 COD_(cr)(40ppm)을 약 85% 이상, 흡광물질을 약 95% 이상 제거하였다.

춘천지역 상수원수 중 휴믹물질의 분리 및 특성

이유미,이동석 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B

Humic substances generally comprise 30-50% of the dissolved organic carbon in water. They can affect water quality adversely in several ways and they are important from a water treatment perspective due to their role as precursors for the formation of chlorination by-products such as trihalomethanes. The objectives of this research are to investigate the characteristics of organic matter using raw water of Chuncheon area, to isolate the humic substance fractions from natural water samples, and characterize the extracted humic substances. Humic substances were fractionated according to "isolation of IHSS aquatic humic and fulvic acids" using XAD resin adsorption technique. Characteristics of humic substances were analyzed through DOC, UV_(254), SUVA_(254), FT-IR spectra, fluorescence analysis.

산성강하물이 지표수의 산성화에 미치는 영향 Ⅰ: 현장 조사

김영관,이동석,김만구,우경식 江原大學校 附設 環境硏究所 1997 環境硏究 Vol.14 No.-

Effects of acid deposition on the acidification of surface water over a short period were studied during June~October, 1995. A reservoir located in Chunchon, Kangwondo was selected for this study because this reservoir had received little man-made pollutants. Geological survey within the study area was carried out and the pH of a small and shallow stream flowing from the mountain valley down to the reservoir was monitored. Rainfall was measured by using a rain gauge and the precipitation was collected by automatic precipitation sampler. During the study period, rain pH was in the range of 3.81~5.77 with an average of 4.8. The EC was in the range of 8~189㎲/cm with an average of 10.6㎲/cm. Ionic composition of the rainfall showed that, of the anions, deposition of SO₄^(2-) was highest with 3,119.7 kg/㎢, and is was NH^(4+)with 1,053.2kg/㎢ for cations. The surface water pHs were maintained neutral or weak basic, representing little evidence of acidification regardless of the acidic rainfall pH. Every time of sampling, however, the pHs exhibited increasing tendency as elevation of measuring site of the stream become lowered, which indicated the impacts of acid-base reactions by acidic or basic substances during travel of water downstream. This result suggested the necessity of further research to determine the respective buffering capacity of soil and underlying rocks. 산성강하물이 단기간에 걸쳐 지표수의 산성화에 미치는 영향을 조사하기 위하여 1995년 6월 부터 10월까지 외부오염원이 거의 없는 강원도 춘천시에 위치한 저수지를 선정하여 인구를 수행하였다. 연구지역 일대의 지질을 조사하고 산골짜기에서 저수지로 흐르는 작고 얕은 하천의 수질을 분석하였다. 강우량은 우량계를 이용하여 측정하였고 강하물은 자동포집기를 이용하여 포집하였다. 연구기간동안의 강우의 pH범위는 3.81~5-77로 평균 4.8을 나타내었으며 전기전도도(EC)sms 5~189㎲/cm로 평균 10.6㎲/cm를 나타냈다. 음이온 중에서는 SO₄^(2-)의 강하량이 3,119.7kg/㎢로 가장 많았고, 양이온 중에서는 NH^(4+)가 1,053.2kg/㎢로 가장 많았다. 지표수의 pH는 중성 또는 약염기성으로 강우의 pH가 산성이었음에도 지표수의 산성화 현상은 관찰되지 않았다. 그러나 골짜기에서 흐르는 하천수를 측정할때마다 측정지점의 고도가 낮아질수록 pH값은 증가하는 경향을 나타내어 물이 하류로 흘러가는 동안에 일어난 산성 또는 염기성물질로 인한 산염기반응의 영향을 보여주었다. 이 결과는 토양의 완충능력과 모암내에서의 중화능력을 각각 구별하여 조사할 필요성을 제시하였다.

1,1-dichloro-2,3,4,5-tetraphenyl-1-silacyclopentadiene의 합성과 이에 대한 Mass Spectroscopic Study

주완철,이동석 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.2

1, 1-Dichloro-2, 3, 4, 5-tetraphenyl-l-silacyclopentadiene is synthesized from the reaction of diphenylacetylene with metal and tetrachlorosilane, where the optimal reaction conditions are also studied. From-the mass spectroscopic study of this 1,1-dichloro-2, 3, 4, 5-tetraphenyl-l-silacyclopentadiene the elimination of meta-stable dichlorosilylene species is confirmed.

화학적 산화법에 의한 부식산의 분해 처리기술에 관한 연구(Ⅰ) : 광산화공정을 통한 부식산의 분해특성 분석;Characteristics by Photocatalytic Oxidation Process

김종부,이동석 江原大學校 附設 環境硏究所 2000 環境硏究 Vol.17 No.-

수질계의 부식산을 화학적 산화처리하기 위한 방법의 하나로 광산화공정을 도입하여 부식산의 특성 변화를 조사하였다. 광산화공정은 UV단독, UV/TiO₂ 및 UV/H₂O₂ 시스템을 실험하였다. UV 단독 조사시 TOC 제거율은 pH 7-9에서 가장 높았으며, 흡광도는 강알카리성 영역에서 감소율이 향상된 결과를 보였다. 각 시스템별로 처리도를 보면, UV/TiO₂ 시스템의 경우 TiO₂의 농도가 50ppm일때 TOC 제거와 흡광도 감소의 효율이 높았으며 50ppm 이상을 투입해도 처리율에 변화가 없었다. UV/H₂O₂ 시스템에서는 과산화수소의 농도가 20mM이 최적의 주입농도로 조사되었으며, 그 이상 투입할 경우 TOC와 흡광도의 처리율이 저하되었다. 탄산이온을 첨가할 경우, TOC 제거율 및 UV 흡광도의 감소율 모두 감소하며, TOC 제거율이 흡광도 감소율에 비해 상대적으로 더 크게 나타났다. The efficiency of Photocatalytic Oxidation Process were investigated for the treatment of Aquatic Humic Substances (AHS). In UV-only system, pH 7-9 was the optimum pH range for TOC removal, and alkali range was the optimum pH for absorbance decrease. In UV/TiO₂system, the optimum TiO₂ dosage was 50 ppm and over 50 ppm of TiO₂ dosage was not effective for removal of AHS. In UV/H₂O₂ sytem, optimum H₂O₂ dosage was 20 mM, when over 20 mM dosage, removal of TOC(Total Organic Carbon) and absorbance was decreased by addition of carbonate ions and TOC removal was more effected than that of absorbance.

한국형 생태산업단지 구축 및 자원화 순환망 구축에 관한 연구

임창호,이동석 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B

Recently, SID (Sustainable Industrial Development) or green growth is the major concern of industries. EIP (Eco Industrial Park) is one of the important part of SID which aims to improve eco-efficiency of resources such as material, energy and water. In this study, current status of Banwol & Sihwa industrial complex relating EIP was investigated and the plan to design of Banwol & Sihwa EIP was suggested.

부식산 제거율 향상을 위한 오존공정의 개선에 관한 연구

이유미,손일호,이동석 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A

Ozone alone, Ozone/GAC, Ozone/H_(2)O_(2) and Ozone/GAC/H_(2)O_(2) processes were introduced for treatment of humic acid, which is a representative refractory organic compound. H_(2)O_(2) and GAC used as catalysts for experiment. The treatment efficiencies of humic acid in each process were analyzed for pH variation, DOC removal, and UV_(254) decrease. UV_(254) decrease in Ozone/GAC and Ozone/GAC/H_(2)O_(2) processes were the highest with about 93%, and Ozone alone and Ozone/H_(2)O_(2) processes were 88%. DOC removal in Ozone/GAC/H_(2)O_(2) process was the highest with 71%. Removal by Ozone/GAC, Ozone alone, and Ozone/H_(2)O_(2) processes were 66%, 39%, and 47%, respectively.

부식산의 광촉매 산화 공정에 도입된 여러 종류이 상용 TiO₂비교연구

문경숙,김다희,이동석 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

In this study, the effects of crystalinity, composition and particle size of TiO2 catalysts on the degradations of humic acid in aqueous solution was assessed using the commercially avaliable TiO2 particles. Photocatalytic oxidations of humid acid (HA, Aldrich Co.) solution were carried out in case of adding different types of TiO2 catalysts and their decomposition efficiencies were analyzed with respect to pH, DOC and UV absorbances values for the HA solutions and compared one another. The experimental results showed that TiO2 particles(Degussa P-25) mixed with anataze and rutile gave the highest degradation efficiencies, respectively and much lower degradation efficiency in TiO2 paticles of rutile only type. In comparing among ST series of anataze types, it was observed that the degradation efficiencies generally were increased with increasing TiO2 contents and surface area of the particles. Higher degradation efficiency of HA was also found in zeolite type(D-TZ) of TiO2 paticles compared with hydroxyapatite type (D-TH) of TiO2 particles.

난분해성 유기물질 제거를 위한 오존/촉매 공정의 비교에 관한 연구

이규환,이유미,이동석 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Ozone alone and catalytic ozone processes were introduced for treatment of humic acid, which is representative refractory organic compound. The treatment efficiencies of humic acid in each process were analyzed in pH variation, DOC removal, and UV_(254) decrease. Mn loaded CAC catalyst was prepared by loading potassium permanganate onto the granular activated carbon surface. BCM-GAC and BCM-Silicagel catalyst were prepared by BCM. UV_(254) decrease in all processes was comparatively high with efficiency over 87%. DOC removal in ozone/GAC process was the highest with 78%, and removal rated for other processes followed the order ozone/BCM-GAC(62%) > ozone/BCM-silica gel(45%) > ozone/silica gel(43%) > ozone/Mn Loaded GAC(42%) > ozone alone(37%).