Product description

Biogas is produced through the Anaerobic Digestion (AD) of organic matter produced by several microorganisms in absence of oxygen.

The products of AD are:

• Biogas: generally composed of 55-65 % methane, 35-45 % carbon dioxide, 0-3 % nitrogen, 0-1 % hydrogen, and 0-1 % hydrogen sulfide.
• Digested substrate, commonly named digestate, used as fertilizer in agriculture.

Product application

Biogas can be used for:

• Electricity production in a CHP gas engine, where the waste heat from the engine is used for heating the digester; cooking; space heating; water heating; and process heating.
• Direct combustion as a fuel in a boiler.
• Grid injection.
• If compressed, it can replace compressed natural gas for use in vehicles, where it can fuel an internal combustion engine or fuel cells. 

Raw materials

All species and fish fractions can be used. Fish wastes need to be pretreated by thermal hygienization (pasteurization) and must have a granulometry < 12 mm before anaerobic digestion.

Digestion of fish wastes as an unique substrate is not recommended because of the presence of inhibitory compounds and its unbalanced C/N ratio. They are usually fed in a percentage varying from 10 to 25 %.

Feasibility

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Competing Companies

Simplified process Scheme