This experiment was carried out to figure out the CO2 biomass and the growth response of Chinese cabbage and radish grown under the condition of high temperature and high CO2 concentration to provide the information for the coming climatic change. Chinese cabbage and radish were cultivated in spring and autumn seasons under 4 treatments, 'ambient temp.+ambient CO2 conc.', 'ambient temp.+elevated CO2 conc.', 'elevated temp.+ ambient CO2 conc.', and 'elevated temp. +elevated CO2 conc.'. The 'elevated temp,' plot was maintained at 5 higher than 'ambient temp. (outside temperature)'and the 'elevated CO2 cone.' plot was done in 650 ppm CO2. The growth of spring-sown Chinese cabbage was worse than autumn-sown one, and was affected more by high temperature than high CO2. concentration. The CO2 biomass of Chinese cabbage was lower as 25.1-39.1 g/plant in spring-sown one than 54.8-63.4 g/plant of autumn-sown one. Daily CO22 fixation ability was not significantly different between spring- and autumn-sown Chinese cabbage as 1.9-2.9, 2.7-3.1 kg/10a/day, respectively. The CO2 biomass of radish were 87.4-104.6 /plant in spring-sown one and 51.3~76.4 g/plant in autumn-sown one. Daily CO2 fixation ability of radish were 6.2-10.1 kg/10a/day in spring-sown one and 4.6-6.9 kg/10a/day in autumn-sown one.

도시생활폐기물소각재(MSWI ash)을 매립하게 되면 장기적으로 중금속이 침출된다. 급속탄산화를 통하여 MSWI ash 내의 중금속을 탄산염 형태로 고정하여, 중장기적으로 침출을 방지할 수 있다. 본 연구에서는 급속 탄산화 방법을 통하여 소각재인 fly ash의 중금속 저감 및 이산화탄소 저감에 대해 수행하였다. NH4OH, NH4SCN, 및Ca(OH)2를 이용하여 test 하였으며, 소각재의 중금속을 탄산화 전, 후를 비교하여 중금속이 침출량을 비교 하였다. 추가적으로 이산화탄소가 fly ash에 포집된 이산화탄소 저감량을 나타내면서 이산화탄소 흡수제의 재사용 가능성을 확인하였다. 흡수제를 재생하는 과정에서 나온 CO32-이온에 의해 탄산화 된 금속염들의 성분 분석을 위해, XRD (X-ray diffraction analyzer(Ultima Ⅳ))를 사용하였다. 그리고 FE-SEM(Field emission scanning electron microscope, JEOL-7800)으로 filtering후 건조시킨 샘플과 fly ash의 표면구조를 촬영하고 비교하였다.

In order to cope with some drawbacks of conventional CCS (Carbon Capture and Storage) technologies, the new way to deal carbon dioxide have been studied a lot. One way to deal emitted carbon dioxide is to convert carbon dioxide into metal carbonate salt which can be used for various purposes such as raw materials for construction, additives for paper-making industries and so on. In this method, securing the source for metal cation is important and in this research, concentrated industrial wastewater was used to supply metal cation. In the wastewater, calcium and magnesium ions were dissolved and this could make cpatured carbon dioxide to be converted to metal carbonate salts. As a result of the chemical conversion, the amount of carbon dioxide converted to the precipitated salts and the crystal structures of them were suggested. To verify the crystal structures and the composition of salt mixtures, Scanning Electron Microscope and X-Ray Diffraction analysis were utilized.

Many researchers around the worlds are getting their attention on developing carbon dioxide reduction technologies. In this research, the method to utilize captured carbon dioxide was suggested using industrial wastewater which was produced from refined salt production process. High concentrations of metal carbonates such as calcium, magnesium and so on were contained in them and it could lead to carbon fixation which can lead to utilization of precipitated salts for various purposes. In this research, 30 wt% of monoethanolamine, diethanolamine and methyl-diethanolamine solutions were used as absorbents and precipitated salts were produced as final product. Using X-ray diffraction and Scanning Electron Microscope, crystal structures of the products were verified.

Municipal solid waste incinerator (MSWI) fly ash was used for accelerated carbonation via bubbling of gaseous carbon dioxide (CO2) after treatment with sodium hydroxide (NaOH). The influence of alkaline concentration and volumetric flowrate of CO2 was investigated. Experimental results showed that carbonation reduced the leaching of Cu, Pb, Zn, and Cr. The pH of leachate decreased from around 12 to 10.5. The content of soluble chlorides was also decreased after carbonation. Additionally, the application of accelerated carbonation enhanced the sequestration of CO2 from MSW incineration plants. The TG/DSC analysis indicated that MSWI fly ash sequestrated approximately 185 g CO2/kg waste.