Biogas is a naturally produced gas consisting mainly of methane and carbon dioxide, which is generated by the anaerobic fermentation of organic matter of various origins: animal waste, plant biomass, waste from farming and food industries. The fermentation takes place inside digesters in humid, oxygen-free conditions. Using biogas for a cogeneration plant is highly recommended for farms, livestock breeders, landfill sites, and manufacturers of plants for the production of biogas from agricultural biomass. Digestate, i.e. the material remaining after anaerobic digestion, can be used as an excellent, nutrient-rich fertiliser.

CMS ENERGY manufactures dry anaerobic digestion plants, including:

Construction of fermenters – These facilities are built entirely of reinforced concrete, with integrated high-insulation panels and perfectly gas-tight doors.

Leachate management – The leachate from anaerobic digestion cells is carried to a temporary storage tank, from which it is then re-circulated within the cells.To keep the leachate temperature constant (and therefor also the temperature of the biomass in the fermenters), the storage tank is also insulated and heated.

Biogas exploitation – The biogas produced in the early stages of anaerobic fermentation is captured, dehumidified, and then piped to the CHP unit. The electricity is fed into the local grid, while the thermal energy recovered from the plate exchangers and/or the fumes is used to heat the reactors, leachate tanks, and any other heating devices.

Management and monitoring system –The plant is equipped with a remote monitoring system that keeps track of the main operating parameters in every moment.

CMS ENERGY thanks to its experience in cogeneration, is able to:

    •    Scale the plant according to the waste available to the user

    •    Offer turnkey plant construction

    •    Ensure careful, specific plant management, maintaining the balance of the business plan

    •    Act as a general contractor and, therefore, handle the chemical/biological management of the digestate, as well as the scaling, supply, and installation of the digester

    •    Offer customers various ways of purchasing and financing the plant

    •    Guarantee continuous assistance

The biogas plant is based on two main elements: the digester, which is the production of biogas, and cogeneration unit in which there’s the transformation of biogas into energy. 

It’s important that there is a continuous control of the management of the fermentation process, but it is essential that the cogeneration module is sized and built with the most efficient technology solutions, because it is from the cogeneration unit which depends the energy efficiency of plant.

There is a wide range of materials from which biogas can be obtained via anaerobic digestion, including:

    •    Energy crops, e.g. maize, Sudan grass, triticale, rye grass, etc.

    •    Crop residues

    •    Animal manure

    •    Sewage sludge

    •    Organic fraction of municipal solid waste

    •    Organic waste from industrial farming and slaughtering