• 한국동물학회:학술대회논문집
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• 한국동물학회 1995년도 한국생물과학협회 학술발표대회
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• pp.243.1-243
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• 1995

No Abstract, See Full Text

• 환경위생공학
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• 제11권2호
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• pp.1-7
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• 1996

The behavior of total organic carbon (TOC) and phosphate were observed for 15 days with immobilized activated sludge using polyacrylamide (PAA) by sequencing batch reactor (SBR). In the preparation of immobilized sludge by PAA, it was found that suitable acrylamide concentration for actual wastewater treatment was to be 15% through the batch test. When SBR system was operated in the repeated aerobic and anaerobic conditions, TOC removal efficiency was 92%. The uptake rate of phosphate was increased from 1.78 mg-P/g cell/hr on the 5th day of acclimation to 2.5 mg-P/g cell/hr on the 15th day of acclimation. And the total phosphorus content in PAA bead was increased from 40 mg-P/g cell on the 1st day of operation to 55 mg-P/g cell on the 15th day of operation. From this study, lowering the volume of aeration tank was possible when PAA bead was used in wastewater treatment and long operation was also possible without the settler.

• Journal of Microbiology and Biotechnology
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• 제24권2호
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• pp.264-269
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• 2014

For the production of ethanol from seaweed as the source material, thermal acid hydrolysis and enzymatic saccharification were carried out for monosugars production of 25.5 g/l galactose and 7.6 g/l glucose using Gelidium amansii. The fermentation was performed with Pichia stipitis KCTC 7228 or Saccharomyces cerevisiae KCCM 1129. When wild P. stipitis and S. cerevisiae were used, the ethanol productions of 11.2 g/l and 6.9 g/l were produced, respectively. The ethanol productions of 16.6 g/l and 14.6 g/l were produced using P. stipitis and S. cerevisiae acclimated to high concentration of galactose, respectively. The yields of ethanol fermentation increased to 0.5 and 0.44 from 0.34 and 0.21 using acclimated P. stipitis and S. cerevisiae, respectively. Therefore, acclimation of yeasts to a specific sugar such as galactose reduced the glucose-induced repression on the transport of galactose.

• 한국물환경학회지
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• 제25권4호
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• pp.502-506
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• 2009

The removal properties of Polyethylene glycols (PEGs) known as the important group of synthetic polymers of ethylene oxide were examined by the bio-reactor equipped with a mesh filter module. PEG-1000 and PEG-2000 were fairly removed on the basis of TOC, which were 75.1% and 51.6%, respectively. In the case of PEG-20000, the removal efficiency of TOC was less than 15.2% and the favorable acclimation of microbes was not obtained. It was suggested that this system could effectively maintain microbes for the biodegradation of low molecular weight of PEG and TOC removal was significantly influenced by PEG molecular weight.

• 한국초전도ㆍ저온공학회논문지
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• 제25권3호
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• pp.7-12
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• 2023

Isolation of pollutant-degrading bacteria is important in bioaugmentation, one of the methods for biological degradation of environmental contaminants. We focused on the magnetic activated sludge (MAS) process as a culture method that efficiently concentrates degrading bacteria, and cultured activated sludge with 1,4-dioxane as a model pollutant. After 860 days of operation, MLVSS, which indicates the amount of sludge, increased from 390 mg/L to 10,000 mg/L, and the removal rate of organic matter including 1,4-dioxane, tetrahydrofuran, and glucose in the artificial wastewater reached up to 97%. Based on these results, the MAS process was successfully used to acclimate activated sludge with 1,4-dioxane. Bacterial flora analysis in the MAS showed that bacteria of the genus Pseudonocardia, already reported as 1,4-dioxane degrading bacteria, play an important role in the degradation of this pollutant. The MAS process is a suitable culture method for acclimation of environmental pollutants, and the findings indicate that it can be used as an enrichment unit for pollutant-degrading bacteria.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 춘계 학술대회지
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• pp.195-196
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• 1998

• 한국동물학회:학술대회논문집
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• 한국동물학회 1997년도 한국생물과학협회 학술발표대회
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• pp.216.2-216
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• 1997

No Abstract, See Full Text

• 한국작물학회:학술대회논문집
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• 한국작물학회 2018년도 추계학술대회
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• pp.233-233
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• 2018

• 한국양식학회지
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• 제13권4호
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• pp.317-323
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• 2000

숭어 치어의 담수 사육을 위한 저염분 순화방법과 이에 따른 적응 능력을 높이기 위하여 염분사료를 공급하여 이에 따른 성장, 생존율 및 어체의 생리상태를 비염분사료구와 비교하였다. 실험 종료시 전장과 체중의 성장률은 해수사육구(SWN), 순차적으로 담수로 옮긴 염분사료구(GFWS) 및 순차적으로 담수로 옮긴 비염분사료구(GFWN)에서 빠르게 담수로 옮긴 염분사료구(FWS) 및 빠르게 담수로 옮긴 비염분사료구(FWN) 순서로 나타났다. 비만도는 모든 실험구에서 서로 차이를 보이지 않았다. 실험어의 생존율은 순차적으로 담수로 옮긴 염분사료구가 92.2${\pm}$2.2%로 가장 높았으나, 다른 실험구와 차이가 없었다. 어체의 수분함량은 빠르게 담수로 옮긴 비염분사료구에서 해수구보다 높게 나타나 차이를 보였다. 체액의 삼투질 농도는 실험 종료시에 모든 실험구에서 차이를 보이지 않았다. $Na^+$ 농도는 실험 종료시 해수사육구, 순차적으로 담수로 옮긴 비염분사료구, 순차적으로 담수로 옮긴 염분사료구 및 빠르게 담수로 옮긴 비염분사료구에서 차이를 보이지 않았다. 체액의 K/$^+$ 농도는 실험 종료시 해수사육구가 다른 실험구에 비교해 높은 수준을 나타냈다.

• 한국수산과학회지
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• 제29권4호
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• pp.431-437
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• 1996

담수에서 양식한 틸라피아를 해수에 순치하면서 pyrrolidine과 piperidine을 지표물질로 사용하여 담수어 특유의 냄새 성분에 대한 제거 효과를 측정하였다. 틸라피아의 마쇄육에 첨가한 아민의 회수율은 각각 $88\%$와 $90\%$이었으며, 틸라피아를 100ppm의 아민 용액에 30분간 노출시킨 후, 하루에 $5\%_{\circ}$씩 염도를 증가시켜 해수에 순치하였을 때, 4일 후에는 근육이나 표피에서 아민이 제거되었다. 담수 중에서의 아민의 제거효과를 보면 72시간 경과한 후에, 근육에 흡착된 pyrrolidine과 piperidine은 각각 $73.4\%$와 $83.7\%$가 제거되었고, 표피에 홉착된 것은 각각 $93.6\%$와 $90.6\%$가 제거되었다. 해수 중에서 72시간 후에 제거되는 pyrrolidine과 piperidine의 양은 근육에서 각각 $66.2\%$ 와 $73.6\%$이었고, 표피에서는 각각 $90.1\%$와 $87.7\%$이었다. 담수 중에서 24시간이 경과한 후에 제거되는 pyrrolidine과 piperidine의 속도상수 $(h-^{-1})$는 근육에서 각각 0.0231과 0.0333이었고, 표피에서 각각 0.0652와 0.0413이었다. 해수 중에서 24시간 후에 제거되는 pyrrolidine과 piperidine의 속도상수 $(h-^{-1})$는 근육에서 각각 0.0313과 0.0354, 표피에서는 각각 0.0674와 0.0549이었다.