碩士 / 國立臺灣海洋大學 / 海洋環境化學與生態研究所 / 103 / Accelerated weathering of limestone (AWL) has recently been proposed as a possible solution for reducing power plant CO2 emissions. Hoping power plant (HPP) located in eastern Taiwan, where the materials needed for AWL, i.e. seawater and limestone, are available and inexpensive to obtain. Consequently, the HPP may represent one of the most ideal sites for the AWL. In this study, seawater samples around the HPP were collected to test the efficiency of CO2 capture of three types of AWL reactors (one-step, two-step, and enlarged two-step reactors), which were designed by the Industrial Technology Research Institute of Taiwan. The results show that for the one-step reactor, captured CO2 mostly remained in the form of molecular or hydrated CO2, which would hasten ocean acidification and is unable to be stored for the long-term, thus suggesting that the one-step reactor may not be a suitable design for the AWL technique. On the contrary, the two-step reactor demonstrated the ability to partially convert the captured CO2 into HCO3−, which is thought to be environmentally benign and can be stored for the long-term in the ocean, and thus may represent a better design. However, under current experimental conditions, neither CO2(g) nor CaCO3(s) dissolution reached optimal levels, even in the most efficient enlarged two-step reactor, which CO2 absorption efficiency is only 9.3%. Therefore, further research and experimentation are still needed to optimize reaction conditions and reactor designs for the greatest effectiveness. Finally, using the collected data, we conducted a simple mixing simulation to show the potential impacts of the AWL effluents on seawater carbon chemistry in the discharge area. The simulated results indicate that a 10-fold dilution would be sufficient to maintain the pH and Ω changes within a range of 0.2 and 0.8, respectively, which are regarded as constraints for safely discharging wastewater into the ocean.
Key words: carbon dioxide, carbonate, accelerated weathering of limestone (AWL)
| Identifer | oai:union.ndltd.org:TW/103NTOU5282009 |
| Date | January 2015 |
| Creators | Syu, Rong-Wei, 徐榮蔚 |
| Contributors | Chou, Wen-Chen, 周文臣 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 43 |
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