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Agricultural biogas plants produce biogas utilizing organic materials found on a farm. Biogas is a renewable fuel source and can be used in combined heat and power production (CHP) systems, or simply “cogeneration systems”, to produce clean electric power and heat. The plant may be designed to accept energy crops that have been grown specifically to input into the digestion facility or agricultural wastes. These crops are typically ensilaged and stored in clamps or hoppers and are continuously fed into the digester throughout the year.

 

Energy Crops and Feedstock for Biogas Production

 

A group of constructions built either from concrete or metal, called “low digesters”, is the typical layout of agricultural biogas plants. They are often topped by a twin-skinned gas storage bag, giving them a characteristic appearance. The first digestion tank produces most of the biogas quantity, with a lower gas yield being attained in the secondary digestate storage tank.


 

Typical energy crops for biogas production:

  • Maize

  • Grass

  • Wheat

  • Rye

  • Triticale

 

Alternatively other organic materials such as waste products may be used:

  • Slurry.

  • Manure.

  • Vegetable waste.

  • Glycerol from biodiesel manufacture.

 

Approximately, it takes 1 acre (0,405 hectares) of whole crop maize to produce enough gas to generate 1kW of electrical power.