• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.761-762
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• 2000

Waste newspaper is many part of Municipal Solid Waste(MSW). Newspaper consist of cellulose, hemicellulose and lignin which biomass components. We could get various compound usable as fuel when pyrolysis of lignin. Therefore, we should get similar phenomena with pyrolysis of newspaper. Highest conversion rate when acetone was used as pyrolysis solvent was $350 {\sim}400^{\circ}C$, $40{\sim}50$minutes.

• Proceedings of the Zoological Society Korea Conference
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• 2001.10a
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• pp.173.3-173
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• 2001

• Proceedings of the Zoological Society Korea Conference
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• 2001.10a
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• pp.173.1-173
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• 2001

• Proceedings of the Zoological Society Korea Conference
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• 2001.10a
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• pp.174.2-174
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• 2001

• Research in Plant Disease
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• v.23 no.1
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• pp.19-34
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• 2017

Recent worldwide demand for organic and sustainable agriculture products is driving the development of formulations of biopesticides effective in the field. Biopesticides have the benefit of environmentally-friendly qualities. However, biocontrol approaches largely have been ineffective in controlling plant pests in field conditions. Previously, we developed a cost-effective biocontrol formulation containing chitin and chitinase-producing biocontrol bacteria with field efficacy. This formulated product has successfully suppressed various plant diseases in the field conditions. In this review, we focus on ecological aspects and the potential mechanisms underpinning the success of chitinase-producing bacteria. In addition, we discuss the possibility on-site cultivation of the formulated products to further strengthen the approach as being farmer friendly and successful.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.04a
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• pp.326-329
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• 2003

본 연구에서는 유류 오염 토양의 복원에 효율적인 것으로 나타난 Biopile 공법을 오염 토양에 적용하였을 경우, 토양의 생물학적 복원이 가능한지 여부를 평가하고자 하였다. 45일간 의 Biopile 실험 결과, 공기 주입 및 영양분 주입 후 TPH의 감소율이 최대 64.75 %까지 나타났다. 또한 공기만을 주입하였을 경우에도 제거율이 약 33 %를 나타내었다. TPH가 6,000 mg/kg인 인공 오염 토양을 사용하여 Biopile 공법을 적용하였을 경우에는 30일 반웅 후 43.46 %의 높은 제거율을 나타내었다. 오염 토양의 균주를 순화/분리 하였을 때 오염 토양 내에 고 활성의 유류 분해 미생물이 확인되었으며, 이들의 유전자 역시 확인되어 자체적으로 생물학적 분해능을 가지고 있는 토양으로 나타났다.

• KSBB Journal
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• v.16 no.1
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• pp.61-65
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• 2001

In this study, a BTX degrading microbial consortium was obtained from the activated sludges of a BTX releasing sewage water and city sewage water treatment plant. The MY microbial consortium was developed for benzene and toluene degradation, whereas the MA microbial consortium was developed for xylene isomers. The major microorganism of the MA consortium was identified as Rhodococcus ruber DSM 43338T, whereas that of the MY consortium was Rhodococcus sp. In terms of the degradation of a single component, the removal rate of benzene was fastest and decreased in order; toluene, o-xylene, p-xylene and m-xylene. For degradation of mixed BTX, most BTX were degraded within 108 hours and the degradation rate showed either stimulatory or inhibitory effects depending on the composition. MA and MY microbial consortium obtained in this study may be used effectively to remove BTX biologically.

• Journal of Korea Soil Environment Society
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• v.3 no.2
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• pp.115-125
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• 1998

The biodegradation of ($C^{14}$)phenanthrene was studied in water and soil-water systems with nonionic surfactants and biosurfactant : polyoxyethylene alkyl ester($C_{17}$$H_33$COO($C_2$$H_4$O)nH) and sophorolipid. The extents of so1ubilization and biodegradation were monitored by radiotracer technique. Experimental results showed that surfactant concentrations above the critical micelle concentration were toxic to the phenanthrene-degrading bacteria in soil or active sludge and the presence of surfactant micelles inhibited mineralization of PAHs. Solubility and bioavailibility of phenanthrene in water and soil-water system were enhanced by mixed surfactants system. The optimum water content and hydrogen concentration were 30% (w/v) , pH 7, respectively.

• Journal of Life Science
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• v.33 no.1
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• pp.82-90
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• 2023

Biological process is used worldwide to treat domestic and industrial wastewater. The process generally uses a mixed microbial culture of sludge. The growth of microorganisms in the sludge produces excess sludge from the wastewater treatment process. Some of the excess sludge is recycled as inoculum for wastewater treatment, but the rest is removed as waste from the process. As wastewater production is increasing worldwide every year, the number of wastewater treatment plants (WWTPs) is also in- creasing, resulting in the generation of large amount of waste sludge. The increasing amount of waste sludge from WWTPs has led to concerns about its management. Sludge disposal has been reported to account for 50~60% of the total operating costs of a WWTP. Sludge disintegration is a new technology that can minimize volume of waste sludge and recover useful components (e.g., P, N, and soluble organic compounds) from it. Various methods of sludge disintegration have been developed based on physical, chemical, and biological treatments or combinations of these. In this review, we focus on sludge disintegration by acid hydrolysis, which is less studied among sludge disintegration methods. Such information can be useful in the development and implementation of a new technology for better sludge treatment.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.6
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• pp.318-324
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• 2017

We evaluated geosmin and MIB biodegradation and adsorption mechanism of biological activated carbon (BAC) and anthracite biofilter. In steady state of BAC process, the geosmin and MIB were completely removed at the 30 min empty bed contact time (EBCT) even though low water temperature ($9^{\circ}C$) in which the activity of attached bacteria decreased. When the water temperature was $26^{\circ}C$, the microbial biomass and activity were higher at the upper layer of the biofilm than at $9^{\circ}C$, and the microbial biomass and activity decreased as the depth was deeper. This is because when the water temperature is high, the biodegradable organic matter (BOM) removal rate in the upper layer is high and the BOM amount that can't be supplied to the lower layer. The Removal rate of geosmin and MIB by BAC process did not show a significant difference compare to activity-inhibited BAC by treated with azide and the biofilter also removed the geosmin and MIB by biological action. It means geosmin and MIB could be removed by competitive relationship between adsorption and biodegradation.