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Wet process for biogas production

1. Energy crops  1aAnimal manure  2. Preliminary pit  3. Chopper  4. Primary digester  4a. Mixer  4b. Heating units  4c. Pipes (gas and liquid)  5. Secondary digester  5a. Gas holder  6. Gas generator  7. Fermented residues  7a. Separator   7b. Transportable dry fermented residue (fertilizers)  7c. Water reservoir  7d. Water for irrigation  8. Heat exchangers  9. Heating system  10. Electricity supply  11. Heat supply for heating elements