Biotechnology and Bioprocess Engineering:BBE

  • 제11권3호
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  • Pages.245-250
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  • 2006
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  • 1226-8372(pISSN)
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  • 1976-3816(eISSN)
한국생물공학회 (The Korean Society for Biotechnology and Bioengineering)
권호 표지

Effects of Hydrocarbon Additions on Gas-liquid Mass Transfer Coefficients in Biphasic Bioreactors

  • Silva, Teresa Lopes da (Instituto Nacional de Engenharia, Tecnologia e Inovacao, Departamento de Biotecnologia, Unidade de Bioengenharia e Bioprocessos, Estrada do Paco do Lumiar) ;
  • Calado, Vitor (Instituto Nacional de Engenharia, Tecnologia e Inovacao, Departamento de Biotecnologia, Unidade de Bioengenharia e Bioprocessos, Estrada do Paco do Lumiar) ;
  • Silva, Nadia (Instituto Nacional de Engenharia, Tecnologia e Inovacao, Departamento de Biotecnologia, Unidade de Bioengenharia e Bioprocessos, Estrada do Paco do Lumiar) ;
  • Mendes, Rui L. (Instituto Nacional de Engenharia, Tecnologia e Inovacao, Departamento de Energias Renovaveis, Unidade de Biomassa, Estrada do Paco do Lumiar) ;
  • Alves, Sebastiao S. (Instituto Superior Tecnico, Departamento de Engenharia Quimica e Biologica, Centro de Engenharia Biologica e Qulmica) ;
  • Vasconcelos, Jorge M.T. (Instituto Superior Tecnico, Departamento de Engenharia Quimica e Biologica, Centro de Engenharia Biologica e Qulmica) ;
  • Reis, Alberto (Instituto Nacional de Engenharia, Tecnologia e Inovacao, Departamento de Biotecnologia, Unidade de Bioengenharia e Bioprocessos, Estrada do Paco do Lumiar)
  • 발행 : 2006.06.30
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초록

The effects of aliphatic hydrocarbons (n-hexadecane and n-dodecane) on the volumetric oxygen mass transfer coefficient $(k_L\;a)$ were studied in flat alveolar airlift reactor and continuous stirred tank reactors (CSTRs). In the flat alveolar airlift reactor, high aeration rates (>2vvm) were required in order to obtain efficient organic-aqueous phase dispersion and reliable $k_La$ measurements. Addition of 1% (v/v) n-hexadecane or n-dodecane increased the $k_La$ 1.55- and 1.33-fold, respectively, compared to the control (superficial velocity: $25.8{\times}10^{-3}m/s$, sparger orifice diameter: 0.5 mm). Analysis of the gas-liquid interfacial area a and the liquid film mass transfer coefficient $k_L$ suggests that the observed $k_La$ increase was a function of the media's liquid film mass transfer. Addition of 1% (v/v) n-hexadecane or n-dodecane to analogous setups using CSTRs led to a $k_La$ increase by a factor of 1.68 and 1.36, respectively (superficial velocity: $2.1{\times}10^{-3}m/s$, stirring rate: 250 rpm). These results propose that low-concentration addition of oxygen-vectors to aerobic microbial cultures has additional benefit relative to incubation in purely aqueous media.

키워드

참고문헌

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