Product Description

CSTR – Continuous-flow Stirred Tank Reactor

The technology chosen by SEBIGAS for anaerobic digestion is CSTR (Continuous-flow Stirred Tank Reactor), based on a semi-continuous flow of fresh biomass as input in the digesters at a controlled temperature and mixed, and an output called digestate.

CSTR Process

 

The plant with its material flows can be schematically shown as follows:

  1. Organic substrates are charged through a buffer tank or a solid feeder, depending on the type of biomass, into the primary digesters;
  2. The primary digester is fed directly with fresh substrates; the mixing inside it is optimized.
  3. The anaerobic digestion continues inside a post digester, a tank with a gasholder, in order to ensure a buffer volume for the produced biogas;
  4. The biogas can be used to produce electric and thermal energy thorough a cogenerator or it can be purified to separate the CO2, for chemical and alimentary industries, from the bio-methane;
  5. The output digestate can be spread on the fields as fertilizer, as it is or divided in solid and liquid fraction.
  6. Low autoconsumptions thanks to the optimization of the running time of mixers and pumps by the control system.

 

Advantages of Sebigas CSTR Technology

  • Limited footprint.
  • Flexible technology able to better manage every kind of available by-product or biomass
  • Easy maintenance in order to limit to zero plant shutdowns.
  • High-quality equipment and materials
  • Excellent mixing system, result of a fluid dynamics study.
  • Low self-consumptions thanks to the optimization of the running time of mixers and pumps by the control system.

For more information on our CSTR Technology, please visit the Sebigas website.

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