• Journal of the Korea Organic Resources Recycling Association
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• v.8 no.2
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• pp.71-76
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• 2000

The biological carbon dioxide fixation using microalgae has been known as an effective carbon dioxide reduction technology. With many environmental factors influencing microalgal productivity, the desirable cultivation factors were investigated using a green alga, Euglena gracilis. It has the high protein and vitamin E to be used as fodder. In batch culture with a photobioreactor, initial pH, temperature, carbon dioxide concentration and light intensity in the optimum cultivation condition were 3.5, $27^{\circ}C$,5-10% and $520{\mu}mol/m^2/s$, respectively. After that, the optimum hydraulic retention time (HRT for the continuous cultivation was 4 days at carbon dioxide concentration of 10%. In this condition, the final dry cell weight was 1.2g/l.

• Proceedings of the Membrane Society of Korea Conference
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• 1992.04a
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• pp.56-57
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• 1992

만성대사 질환인 당뇨병 치료제로서 인슐린은 가장 널리 상용되는 약가운데 한가지 이다. 그러나 인슐린은 생물학적 반감기가 매우 짧아서 효과적으로 투여하기가 매우 어려워 현재까지 주사를 이용하여 투여하고 있으며 이에 따른 환자의 고통, 주사에 따른 불편함 및 과량의 인슐린이 투여 될 경우에 생기는 저혈당증등 여러가지 부작용을 수반하게 된다.

• Proceedings of the Korean Society of Crop Science Conference
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• 2001.09a
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• pp.152-153
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• 2001

• Transactions of the Korean hydrogen and new energy society
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• v.12 no.1
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• pp.1-10
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• 2001

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2008.04a
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• pp.648-650
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• 2008

• Journal of Korean Society of Environmental Engineers
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• v.27 no.9
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• pp.917-922
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• 2005

The wastewaters from textile and dyeing industries are difficult to treat due to its high pH, temperature, color intensity and non-biodegradable organic contents. This study investigated the removal of recalcitrant organics in a dyeing wastewater by using a packed bed reactor (PBR) that contained cell-immobilized pellets. The feed, obtained from an effluent of a biological treatment plant, had $SCOD_{Cr}$ of 330 mg/L and $SBOD_5$ of 20 mg/L on average. In immobilizing the cells to a Polyethylene Glycol(PEG) based medium, activated sludges from either a sewage treatment plant or an industrial wastewater treatment plant were used. When the empty bed contact time (EBCT) was above 8 hrs in the PBR, the $COD_{Cr}$ removal efficiency was over 50% and the $COD_{Mn}$ concentration was 72 mg/L or lower on average, which was substantially lower than the discharge standard of 90 mg/L. The results indicated that the optimum EBCT in the PBR was 8 hrs. The PBR with cell-immobilized pellets was effective as an advanced treatment process after an activated sludge process for treating dyeing wastewaters.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.14 no.1
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• pp.63-68
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• 2009

Among various microscopic organisms producing photobiological hydrogen, cyanobacteria have long been recognized as the promising biological agents for hydrogen economy in 21 century. For photobiological production of hydrogen energy, marine unicellular $N_2$-fixing cyanobacteria have been evaluated as an ideal subgroup of Cyanophyceae. To develope the hydrogen production technology using unicellular $N_2$-fixing cyanobacteria, 3 important factors are pre-requisite: 1) isolation of the best strain from marine natural environment, 2) exploration on the strain-specific optimal conditions for the photobiological hydrogen production, and finally 3) application of the molecular genetic tools to improve the natural ability of the strain to produce hydrogen. Here we reviewed the recent research & development to commercialize photobiological hydrogen production technology, and suggest that intensive R&D during next 10-15 years should be imperative for the future Korean initiatives in the field of the photobiological hydrogen production technology using photosynthetic marine unicellular cyanobacterial strains.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.2
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• pp.147-152
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• 2009

In this study, the applicability of alginate-immobilized Pseudomonas putida mt-2 KG1206 on the environments, contaminated with toluene analogs was conducted. Genetically engineered strain KG1206 produces light by direct (m-toluate, benzoate) and indirect (toluene, xylenes) inducers. The protocol for the alginate-immobilization was determined in terms of the cell to alginate ratio, solution, proper number of alginate beads, and other conditions. Maximum bioluminescences of five chemicals by immobilized strain were generally observed in following orders: m-toluate > p-xylene > toluene > o-xylene > m-xylene. In relationship between bioluminescence activity and inducer reduction, initial m-toluate (5 mM) in solution was removed approximately 48% of initial at 5 h exposure, showing continuous decrease of inducer chemical in solution. These results of study with alginate-immobilized beads would be useful, especially, for biomonitoring of contaminated environments with specific compounds, such as petroleum hydrocarbon compounds including toluene analogs.

• Applied Chemistry for Engineering
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• v.28 no.6
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• pp.685-690
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• 2017

Ammonia is a useful substance which is widely used in various industries. It is generally released by the decomposition of agricultural wastes and known to have toxic effects on human beings. Due to the common usage, it is possible to cause water pollution through either direct or indirect leakage. Such cases, it is preferable to use the adsorption capacity of zeolite to rapidly remove ammonium ions, but it is not sufficiently removed by the adsorption only. In this paper, the removal efficiency of ammonium ion through both the adsorption capacities of commercial synthetic zeolites and the biological mechanism of microorganisms were compared. In addition, microorganisms were immobilized on the zeolite in order to enhance the removal efficiency by applying a chemo-biological process. As a result, the standard commercial zeolite showed 67~81% of the removal efficiency in 2~4 hours at a 100 ppm concentration of ammonium, whereas the selected microorganism Klebsiella pneumoniae subsp. Pneumoniae showed up to 97% within 8 hours. When the microorganism was immobilized on the zeolite, the highest removal efficiency of approximately 98.5% were observed within 8 hours.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.501-502
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• 2001

Characteristics of $CO_2$ fixation by Chlorella sp. HA -1 were studied in a high cell culture using semi-continuous mode. As a result, it may be possible to obtain not only high cell concentration but also effective $CO_2$ removal at a moderate dilution ratio, which is' the most significant factor to control the microalgal growth in the semi-continuous mode.