Unit 4.2: Start-up

Background and Guiding Questions

Getting any biological system to operate requires careful attention to a number of parameters. While those parameters that assure a good start up are not technically difficult, failure to follow the correct procedure or to properly monitor the startup methods result in either a long delay in the anaerobic digestion startup process or a total failure of the system to produce biogas.

Guiding Questions

  • How do you start biogas production in a digester?
  • What is the advantage of adding “seed sludge or effluent” for digester start-up?
  • Why is starting a digester difficult in the winter?

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