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Objective & Scope
1. Development of biological CO2 fixation process 2. Mathematical modeling of biological CO2 fixation 3. Design and evaluation of photoreactor Main Contents Carbon dioxide is considered as a major greenhouse gas causing the global warming problem. Biological CO2 fixation (BCF) is thought to be an environmentally friendly, energy-efficient process to remove CO2 using microalgal photosynthesis. However, there are some problems to be solved in this biological method. This study suggested engineering solutions of such unsolved problem of BCF process. The growth kinetic model incorporating this light distribution model was developed and used to predict and simulate the BCF performance at various situations as well as to optimize operating conditions of BCF process. In order to overcome the microalgal inhibition by high CO2 concentration, the simple method to adapt microalgae to such an abnormal CO2 condition was developed. Another problem of BCF process, low CO2 conversion, was solved by means of the gas recycling photobioreactor. Also, the BCF process was combined with advanced wastewater treatment process in order to improve the economical efficiency. Related Projects References 1) Simultaneous removal of carbon dioxide from waste flue gas and nitrogen compounds from wastewater by algal cultivation Yeoung-Sang Yun, Thesis of Master(1996), POSTECH, KOREA 2) Analysis of photobioreactor systems for biological carbon dioxide fixation Yeoung-Sang Yun, Thesis of Doctor (2000), POSTECH, KOREA 3) Enhancement of CO2 tolerance of Chlorella vulgaris by gradual increase of CO2 concentration Y.-S. Yun, J.M. Park and J.W. Yang, Biotech. Tech., 10(9), 713 (1996) 4) Development of gas recycling photobioreactor system for microbial algal dioxide fixation Y.-S. Yun and J.M. Park, Korean J. Chem. Eng., 14(4), 297 (1997) 5) Variations of photosynthetic activity and growth of freshwater algae according to ozone contact time in ozone treatment Y.-S. Yun, S.R. Lim, K.K., Cho and J.M. Park, Biotech. Lett., 19, 831 (1997) 6) Carbon dioxide fixation by algal cultivation using wastewater nutrients Y.-S. Yun, S.B. Lee, J.M. Park, C.I. Lee and J.W. Yang, J. Chem. Tech. Biotech., 69, 451 (1997) 7) Dependence of carbon dioxide concentration on microalgal carbon dioxide fixation Y.-S. Yun, J.M. Park, and B. Volesky, Hwahak Konghak, 37(5), 800 (1999) 8) Modeling of microalgal photosynthetic activity depending in light intensity, light penetration and cell density Y.-S. Yun, J.M. Park, and B. Volesky, Korean J. Biotech. Bioeng., 14(4), 414 (1999) 9) Simultaneous treatment of carbon dioxide and ammonia by microalgal culture Y.-S. Yun, J.M. Park, and B. Volesky, Hwahak Konghak, 14(3), 328 (1999) 10) Attenuation of monochromatic and polychromatic lights in Chlorella vulgaris suspensions Y.S. Yun and J.M. Park, Appl. Microb. Biotechnol., 55(6), 765 (2001) 11) Kinetic modeling of light-dependent photosynthetic activity of the green microalga Chlorella vulgaris with fractional factorial design Y.S. Yun and J.M. Park, Biotechnol. Bioeng., in press. |
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