Sebigas - Continuous Flow Stirred Tank Reactor (CSTR)
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.
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Technology Overview
The plant with its material flows can be schematically shown as follows:
- Organic substrates are charged through a buffer tank or a solid feeder, depending on the type of biomass, into the primary digesters;
- The primary digester is fed directly with fresh substrates; it has a slab roof in order to optimize the mixing inside it;
- The anaerobic digestion continues inside a post digester, a tank with a gasholder, in order to ensure a buffer volume for the produced biogas;
- 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;
- The output digestate can be spread on the fields as fertilizer, as it is or divided in solid and liquid fraction.
- Low autoconsumptions thanks to the optimization of the running time of mixers and pumps by the control system.
Advantages
- Flexible technology able to better manage every kind of available biomass
- Maintenance simple and optimized in order to not have plant shutdowns
- Maximum plant availability thanks to high-quality equipment and materials
- Excellent mixing system, result of a fluid dynamics study in collaboration with the University of Bologna
- Low autoconsumptions thanks to the optimization of the running time of mixers and pumps by the control system.
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