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Organic waste such as manure, biowaste, restaurant leftovers and renewable raw materials can be used as high-energy input feedstock for biogas plants.
The biogas process is under way around the globe, e.g. at the bottom of lakes, in compost piles or in the stomach of cows. However, to make meaningful and efficient use of the biogas, this process needs to be controlled. In biogas plants, the digestion process takes place in a digester in which the input substances are decomposed to biogas with the help of bacteria under exclusion of light and oxygen.
To be able to use biogas as biomethane, carbon dioxide and other unwanted components must be removed from the gas. There are various technological methods to achieve this. By means of the process, the methane content in biogas increases from approximately 60 percent to up to 98 percent, resulting in a biomethane grade whose chemical structure resembles that of natural gas. For this reason, biomethane can be fed into the gas grid.
Apart from the biogas, the digestion process yields digestate consisting of organic mass and minerals. This digestate can be used as high-quality fertiliser in the fields of agriculture and horticulture.
As biomethane is available throughout Germany via the natural gas grid, a combined heat and power (CHP) plant does not necessarily have to be located close to a biogas plant. Biomethane can be used wherever a gas line is available and can be transformed into green power and heat.
When utilising biomethane in a CHP plant or a gas boiler, heat is released. This heat can be used for heating purposes in residential buildings, offices, communal facilities, swimming pools or industrial sites. It is also possible to use the heat for drying wood, grain or sludge.
Combined heat and power (CHP) plant produce green power from biomethane.