Bioreactor Configurations and Instrumentation Quiz
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Questions and Answers

What is a characteristic of tray bioreactors used at commercial scale?

  • They require minimal labor and large areas
  • They always use sterilizable and microporous bags for sterility maintenance
  • They are only applied for the Koji process
  • They may be perforated or non-perforated, and come in various sizes (correct)

    • What is a challenge associated with the use of tray bioreactors in industry?

  • They are highly efficient in heat removal
  • They are suitable for a wide range of product types
  • They require intensive labor and large areas (correct)
  • They have minimal sterilization requirements

    • What is an alternative method mentioned for maintaining sterility in tray bioreactors?

  • Discontinuously rotating drum operation
  • Exposure to controlled environment with ejectors and air filters
  • Implementation of continuous agitation
  • Use of sterilizable and microporous bags (correct)

    • What is an example of a solid state fermentation (SSF) bioreactor without forced aeration?

    <p>Trays</p> Signup and view all the answers

    What is a characteristic of horizontal drum bioreactors with forced aeration?

    <p>Agitation may occur continuously or intermittently</p> Signup and view all the answers

    What is a common challenge associated with the use of tray bioreactors in industry?

    <p>Difficulty in maintaining sterility</p> Signup and view all the answers

    What is an example of a solid medium used in tray bioreactors?

    <p>Wood</p> Signup and view all the answers

    What is the purpose of agitation in a horizontal drum bioreactor with forced aeration?

    <p>To remove heat accumulation in the substrate bed</p> Signup and view all the answers

    According to Durand (2003), what was the largest reactor cited in the literature for kinetic studies of Rhizopus?

    <p>200 L stainless steel rotating drum</p> Signup and view all the answers

    What is an alternative to maintain sterility in tray bioreactors?

    <p>Use of sterilizable and microporous bags</p> Signup and view all the answers

    What is the most significant problem in scale-up of solid state fermentation (SSF) bioreactors?

    <p>Intense heat generation and system heterogeneity</p> Signup and view all the answers

    What is a major challenge associated with microbial growth under aerobic conditions in SSF bioreactors?

    <p>Considerable production of heat</p> Signup and view all the answers

    Why are commercial designs of bioreactors absent in some bioprocesses involving solid state fermentation?

    <p>Lack of standardized processes and limited reproducibility</p> Signup and view all the answers

    What is the primary factor that makes it difficult to remove the heat produced during microbial growth in SSF bioreactors?

    <p>Absence of a free aqueous phase for heat removal</p> Signup and view all the answers

    Which parameter poses a challenge in controlling the environment within solid state fermentation (SSF) bioreactors?

    <p>Moisture level</p> Signup and view all the answers

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