한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제37권2호
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  • Pages.176-182
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  • 2009
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

통성혐기성 수소생산균주 Rhodopseudomonas sp. MeL 6-2를 이용한 수소생산효율에 미치는 포도당 및 자당 농도의 영향

Effect on the Concentration of Glucose and Sucrose on the Hydrogen Production using by the Facultative Anaerobic Hydrogen Producing Bacterium Rhodopseudomonas sp. MeL 6-2

  • Lee, Eun-Young (Department of Environmental Engineering, University of Suwon)
  • 투고 : 2009.04.04
  • 심사 : 2009.05.15
  • 발행 : 2009.06.28
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초록

안양천 공단 주변 슬러지를 미생물 접종원으로 무기염배지에 10 g/L의 자당을 첨가하여 수소 생산 균주 MeL 6-2을 분리하였다. 분리 균주 MeL 6-2은 호기성조건과 혐기성 조건에서 모두 생장하는 통성 혐기성 균주 Rhodopseudomonas sp.였다. 유기성 폐기물 내에 다량 함유되어있는 포도당과 자당의 농도변화가 수소 생산 속도 및 수소 생성효율에 미치는 영향에 대하여 알아보았다. 포도당을 1~12 g/L의 범위로 첨가할 경우 lag phase 없이 생장하였으며, 첨가량이 증가할수록 단위시간 및 단위부피당 수소 생산성 이 증가하여, 10 g/L에서 최대값인 $4.2\;mmol-H_2{\cdot}L^{-1}{\cdot}h^{-1}$을 보이고 그 이후 다소 감소하는 경향을 보였다. 균체량에 대한 수소생산수율은 $0.76{\sim}2.46\;L-H_2{\cdot}g-DCW^{-1}$의 값을 보였으며, 첨가된 기질인 포도당에 의한 수소생산수율은 $2.6{\sim}3.1\;mol-H_2{\cdot}mol-glucose^{-1}$의 범위였다. 자당을 1~12 g/L의 범위에서 첨가할 경우 약 10시간의 지체기 후 원할한 생장을 보였다. 단위시간 및 단위 세포무게 당 비수소 생산속도는 및 수소 생산수율은 자당의 첨가량이 증가할수록 증가하여 각각 $163\;mmol-H_2{\cdot}mg-DCW^{-1}{\cdot}h^{-1}$ 및 $4.5\;mol-H_2{\cdot}mol-glucose^{-1}$의 최대값을 보였다.

Hydrogen producing bacterium, strain MeL 6-2 was isolated from the sludge of the factory areas in Anyang through the acclimation in basal salt medium (BSM) supplemented with 10 g/L of sucrose. Isolated strain MeL 6-2 was a facultative anaerobe which could grow in both aerobic and anaerobic environments. An aerobically grown pure culture isolated from enriched culture was analyzed by 16S rDNA sequencing and identified as Rhodopseudomonas sp. MeL 6-2. Effects of the concentrations of glucose and sucrose on the hydrogen production rate and the hydrogen production yield were investigated. When glucose in the range of 1~12 g/L was supplemented to the BSM, strain MeL 6-2 could grow without lag phase. An increased glucose concentration increased the specific hydrogen production rate linearly to $4.2\;mmol-H_2{\cdot}L^{-1}{\cdot}h^{-1}$ at 10 g/L, and $60\;mmol-H_2{\cdot}mg-DCW^{-1}{\cdot}h^{-1}$, but decreased slightly as the concentration increased to 12 g/L. The hydrogen production yield was maintained over a range from 2.6 to $3.1\;mol-H_2{\cdot}mol-glucose^{-1}$. When sucrose in the range of 1~12 g/L was supplemented to the BSM, strain MeL 6-2 could grow after ten hours. An increased sucrose concentration increased the specific hydrogen production rate and the hydrogen production yield to $163\;mmol-H_2{\cdot}mg-DCW^{-1}{\cdot}h^{-1}$ and to $4.5\;mol-H_2{\cdot}mol-sucrose^{-1}$, respectively.

키워드

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