The purpose of this study is to create a new odor analysis technology that combines the separation technology of GC and the measurement of MOS sensors. The detector of the GC system is replaced with the MOS sensor to analyze various odor compounds. Carrier gas also used air in the normal atmosphere through a micro pump. Therefore, it is possible to develop a portable odor analysis device since no additional cylinder is needed. Retention times for H2S, C7H8, and C2H4O analyzed by the combined GC/MOS system were identified as 1.28 minutes, 3.88 minutes and 1.77 minutes, respectively. Measurement reproducibility of odorous RT was very good at less than 1.2 %RSD. Also, the magnitude of the peak as a result of changes in the concentration of each odor showed a linear proportional relationship. Thus, a new method could be proposed to analyze various odorous substances with the combined GC/MOS system.

The purpose of this study is to produce an adsorbent material with biomass by-product that are readily visible in daily life. The biomass by-product used in the study are coffee grounds, oak leaves and chestnut peels. These biomass by-products were produced with dry, carbonization and activation treatments. The equipment for the evaluation of adsorption capacity was the batch type system to measure the concentration of test gases with the odor sensor device. Biomass by-products have been shown to improve the absorption characteristics of adsorbent through carbonization and activation. The adsorbent made with coffee grounds and chestnut peels had superior adsorption capacity to hydrogen sulfide (H2S) and complex odor (H2S & NH3) in a comparison with regular activated carbon. The odor sensor device could be used to evaluate the device of adsorption capacity of the adsorbent.

정수슬러지를 탄화 및 활성처리하여 흡착제를 제조하였으며, 이를 이용한 황화수소 흡착특성을 고찰하였다. 제조 된 흡착제에 대한 BET측정 및 SEM 등 물성분석을 실시하였으며, 황화수소를 대상으로 회분식의 흡착평형실험 을 실시하였다. 실험변수로는 활성처리시 적용되는 약품종류 및 농도 등이 적용되었다. 실험결과, 정수슬러지는 탄화나 약품첨착과정을 통해 커다란 성능 향상이 이뤄짐을 알 수 있었다.

H2S adsorption characteristics of adsorbent made by coffee waste were investigated. For analyses of the manufactured adsorbent, various methods such as scanning electron microscope(SEM), measurements of BET(Brunauer Emmett Teller) surface area, pH, and Iodide adsorption were adopted. As major adsorption characteristics, adsorption equilibrium capacity was measured by using a batch type experimental apparatus for operating variables such as adsorption temperature(25～45℃), adsorbent types. The experimental result showed that the H2S adsorption equilibrium capacity of adsorbent made by coffee waste much more increases with steam activation for the coffee waste.

The objective of this study is to investigate partial oxidation of NO with desulfurization in dry sorbent injection(DSI) process using dry sorbent and additives. The effect of the main operating variables directly related to desulfurization efficiency has been also tested. These variables are Ca/S ratio, temperature, inlet SO2 concentration and gas flow rate. The experiment was carried out for partial oxidation of NO with desulfurization in dry sorbent injection process using NaClO2 and CaCl2. The experimental results showed that partial oxidation of NO with desulfurization was increased in DSI process using little NaClO2. It was also found that the injection of CaCl2 was effective in increasing only SO2 removal efficiency. Increase of SO2 removal performance and promotion of partial oxidation of NO using the two additives at low temperature was confirmed.

본 연구에서는 복합 중공사 막을 이용하여 가스 중 수분(water vapor)의 제거에 관한 연구를 수행하였다. 막 소 재로는 PEI (Polyetherimide)를 사용하였고 건/습식 상전이 법을 이용하여 중공사 형태로 제조한 후, 표면에 PEBAX (Polyether block amides) 3533또는 PEBAX1657를 코팅하여 복합 중공사막을 제조하였다. 제조된 중공사 막에 대한 SEM 관찰을 통하 여 외부 표면에 치밀한 선택층과 망상구조의 하부로 이루어진 비대칭 구조임을 확인하였다. 막의 수분 투과특성을 확인하기 위하여 수분활성도(Water activity), 온도와 압력 변화에 따른 수분과 N2의 투과도를 측정하였다. PEBAX3533을 코팅한 복합 중공사 막의 수분 투과도는 운전 조건에 따라 385.6∼727.3 GPU, 수분/N2 선택도는 61.7∼118.5의 값을 나타내었다. PEBAX1657 코팅의 경우, 수분 투과도는 204.1∼562.1 GPU, 수분/N2 선택도는 85.3∼175.4의 값을 나타내었다. 막의 수분 제거율은 PEBAX3533 코팅한 경우에 90%를 나타내었다.

H2S adsorption characteristics of adsorbent made by fallen leaves were investigated. For analyses of the manufactured adsorbent, various methods such as scanning electron microscope(SEM) and measurements of BET surface area were adopted. As major adsorption characteristics, adsorption equilibrium capacity was measured by using a batch type experimental apparatus for operating variables such as adsorption temperature(25~45℃) and adsorbent types. The experimental result showed that the H2S adsorption equilibrium capacity of adsorbent made by fallen leaves decreased with increasing adsorption temperature due to physical adsorption phenomena. It was also found that the H2S adsorption capacity of the adsorbent increased remarkably by an acid treatment with HCl solution.

H2S adsorption characteristics of adsorbent made by drinking water treatment sludge were investigated. For analyses of the manufactured adsorbent, various methods such as scanning electron microscope(SEM), measurements of BET surface area were adopted. As the major adsorption characteristic, breakthrough curve was measured by using a continuous fixed bed adsorption column for operating variables such as aspect ratio(L/D, 3∼9), gas flow rate(0.2∼1.0 liter/min) and type of samples. The experimental results showed that the breakthrough pint decreased with increasing gas flow rate, but increased with increasing aspect ratio. It was also found that the physical and chemical treatments of drinking water treatment sludge are very important for the improvement in H2S adsorption capacity due to property changes of the sludge.

Oxidation characteristics of benzene as a VOC were investigated using a fixed bed reactor system over transition metal catalysts. The transition metal catalysts were made by using transition metal nitrate reagent and various support materials such as γ-Al2O3, and TiO2. The parametric tests were conducted at the reaction temperature range of 200～500℃, benzene concentration of 2,000～3,000 ppm with space velocity of 10000 hr-1. The property analyses such as BET, SEM, TGA and the conversions of catalytic oxidation of VOC were examined. The experimental results showed that the BET surface areas of catalyst are 86.4∼167.7m2/g, the pore volumes are 0.049∼0.056cm3/g, and the average pore sizes of catalyst are 27∼44Å, which mean the meso pore. It was also found that the conversion of benzene oxidation reaction at 400∼500℃ with Cu/γ-Al2O3+TiO2 catalyst showed 90∼100%, which indicate that the transition metal catalyst with composite supports is very effective for the oxidation of benzene.

폴리이미드는 유리상 고분자로서 높은 화학적 저항성과 열적 안정성을 지니고 있으며, 기계적 물성이 거의 변하지 않는다. 본 연구에서는 황화수소와 메탄의 투과특성을 알아보기 위하여 폴리이미드 중공사막을 건/습식 상전이 공정에 의하여 제조하였고, 제조된 중공사막의 구조 및 실리콘 코팅 전/후의 황화수소와 메탄의 투과특성에 대하여 알아보았다. 압력이 증가함에 따라 황화수소의 투과도는 가소화 현상으로 인해 증가하였고, 황화수소와 메탄의 선택도 역시 증가하는 것으로 나타났다. 실험에 사용된 세 종류의 막 가운데 KSM03b의 투과도와 KSM03d의 선택도가 가장 높은 것으로 나타났다. air gap이 증가 할수록 투과도는 감소하지만 선택도는 증가하였다. 또한 실리콘 코팅 후 투과도는 감소하였지만, 선택도는 증가하였고 7기압에서 KSM03d의 선택도는 275이었다.

Treatment characteristics of benzene were investigated by using a fixed bed reactor system applying a hybrid method over composites of photocatalyst and adsorbent. Various composites were made by mixing photocatalyst with adsorbent, such as activated carbon, activated carbon fiber, and sludge. Performance tests were conducted with benzene concentrations of 1,000～3,000 ppm, Benzene flow rates of 50～100cc/min, and packing weights of 14～24g for the various composite samples. The property of benzene treatment was analyzed concerning BET, SEM, pH, and the conversion efficiency. It was concluded by experimental results that the benzene conversion efficiency of a hybrid method was much higher than that of a photocatalyst only method showing a conversion efficiency range between 13% and 65%. It was also found that the comprehensive feasibility study of the hybrid method would be needed with consideration of various factors including additional expenses.

Characteristics of VOC(benzene) treatment were investigated using a fixed bed reactor system over copper base catalyst and photocatalyst/adsorbent blending material. The copper base catalysts were made by using copper nitrate reagent and various support materials such as γ-Al2O3, TiO2. The parametric tests were conducted at the reaction temperature range of 200～400℃, benzene concentration of 1,000～2,000 ppm, and space velocity range of 5,000～10,000 hr-1. The property analyses such as BET, SEM and the removal efficiency(conversion) of VOC were examined. The experimental results showed that the VOC removal efficiency of hybrid method was higher than that of single method. It was also found that the comprehensive feasibility study of hybrid method would need with considering various factors including additional expenses.

Oxidation characteristics of benzene as a VOC was investigated using a fixed bed reactor system over copper base catalysts. The copper base catalysts were made by using copper nitrate reagent and various support materials such as γ-Al2O3, TiO2, and zeolite. The parametric tests were conducted at the reaction temperature range of 200～500℃, benzene concentration of 1,000～2,000 ppm, and space velocity range of 5,000～20,000 hr-1. The property analyses such as BET, SEM, XRD and the conversions of catalytic oxidation of VOC were examined. XRD analysis on copper catalysts showed CuO crystal forms and the peak intensity of CuO increased as the impregnation weight of copper grew. The experimental results showed that the conversion was increased with decreasing space velocity. It was also found that Cu/γ-Al2O3+TiO2 catalyst showed the highest activity for the oxidation of benzene and 15% metal loading was the optimum impregnation level.

The characteristics of fluidized bed catalytic combustion for sludge treatment have been studied in a pilot scale of fluidized bed combustor. 1.0wt% Pt of catalyst supported on the spherical alumina was mixed with the spherical pure alumina as a bed material. Sewage sludge, heating value of which is 3,440 kcal/kg, was used as a waste sample in the experiment. Through the experiments, the various characteristics such as a bed temperature profile and flue gas(CO, SO2) concentration profile were investigated and the catalyst mixing ratio and sample feed rate were applied as experimental parameters. The experimental results showed that bed temperature was maintained more highly and flue gas concentration decreased with the increase of the catalyst mixing ratio, and bed temperature was maintained more highly also and flue gas concentration increased with the increase of the sample feed rate. The combustion efficiency of fluidized bed catalytic combustion of the sludge increased with the increase of the catalyst mixing ratio and sample feed rate and reached more than 96%.

Mercury has been identified as a potential health and environmental hazardous material. Activated carbon adsorption offers promising potential for the control of mercury emissions, and sulfur impregnated (sulfurized) activated carbons has been shown to be an effective sorbent for the removal of vapor phase Hg˚ from sources. In this work, vapor phase mercury adsorption by sulfur impregnated activated carbons were investigated. Sulfur impregnated activated carbons were made by variation of impregnation temperature, and the comparison of adsorption characteristics with commercial virgin and sulfurized carbons were made. Factors affecting the adsorption capacity of virgin and sulfurized activated carbons such as pore characteristics, functional groups and sulfur impregnation conditions were discussed. It was found that the sulfur allotropes plays a critical role in adsorption of mercury vapor by sulfurized activated carbons.