METHANYSOne principle, several ways to do it.
The right process depends on the inputs available, the scale of the project and how the energy will be used.
Wet digestion: mesophilic or thermophilic?
Orders of magnitude for agricultural wet digestion; real values depend on inputs, design and operator.
How a wet-process plant works
Swipe sideways on a phone. Typical layout; each project adapts it (post-digester, gas storage, upgrading unit…).
Electricity and heat on site
The biogas feeds an engine that produces electricity for the grid and heat for the digester, a dryer or a heating network.
Purified and injected into the gas grid
Purified to natural-gas quality (about 97% methane), then injected into the distribution or transport grid.
Bio-CNG and bio-LNG for vehicles
Biomethane compressed or liquefied as a fuel for trucks, buses and utility fleets.
The second product: a fertiliser for soils
Digestion removes carbon as biogas but keeps nitrogen, phosphorus and potassium. Used as an organic fertiliser, digestate returns nutrients to the soil and reduces the need for synthetic fertilisers. Agricultural and industrial digesters therefore recover both energy and fertility from waste.