On-Farm Biogas Plant

1Preliminary Pit – Depending on the amount of dry matter in the waste substrate, we select the right pump to move the manure to the collection pit with minimal blockage.

2Collections Pits – The liquid manure must be agitated to prevent stratification, so high-speed submersible mixers are needed at this stage.

3Silage Water – Captured silage water can be used as fertilizer and pumped directly into the substrate end storage container.

4Substrate Mixing – In order to maximize the potential energy of the substrate, it must be treated and processed. Homogeneity, temperature and solids content are the keys at this stage in the process.

5Digester – Large “banana mixers” are used to ensure the controlled mixing of the substrate, as well as pushing gas bubbles to the surface.

6Post-Digester – At this stage, the substrate is more fluid and requires less agitation. Compact and medium-sized mixers prevent stratification and help transport gas to the surface.

7Compit 901 Pump Station – A key step in the biogas production system is the removal of water. The Flygt Compit is the ideal pump station for use as a collection pit for biogas percolating juices and condensate. Optional pumps with external choppers are available.

8Substrate End Storage Container – The final destination for the fermented substrate is the end storage container. The substrate is homogenized with mixers and then a submersible pump moves it out for field application or for subsequent nutrient recovery.


Biogas Plant Equipment Components


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Combo Systems

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Compit 901 Pump Station

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BIS-1 Biogas Support System

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Other Accessories

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Biogas Production Brochure – Flygt




4460 Biogas Mixer Brochure – Flygt




CFD Analysis of Mixing in a Digester PowerPoint – Flygt



Biogas Production Brochure – Vogelsang



Solid Matter Feeding for Biogas Brochure – Vogelsang