Energy from biogas
Substrates // Method of function // Advantages
In Germany alone, more than 9,000 biogas plants generate electricity, heat and steam, and for several years they have also been producing fuel. Biogas is by far the most versatile renewable energy source. Its potential in Germany has not yet been fully realized.
Organic residues from the food industry and from agriculture as well as municipal waste and renewable resources can all be used in biogas plants.
Various microorganisms decompose the biomass into biogas in several steps under anaerobic conditions. The microorganisms process the carbohydrates, proteins and fats. The plant nutrients such as nitrogen, phosphorus, potassium and lime remain largely unchanged in this process.
Biogas is a gas mixture, the composition of which depends on the input materials. The most important components of biogas are combustible methane and carbon dioxide.
To reduce the particle size of solid substrates and for the continuous charging of the fermenter a dosing feeder is used. Liquid substrates such as slurry can be pumped into the container directly or via a collecting pit.
The fermenter is the core of the plant. Here, under the exclusion of light and oxygen, bacteria convert the substrate into biogas. To facilitate this, the fermenter is generally heated to around 38 to 42 °C (mesophilic) or 55 °C (thermophilic) and is mixed regularly. But there are no rules without exceptions. The Tlow process developed and patented by us works at a fermentation temperature of 25 to 30 °C (psychrophilic) and is particularly suitable for nitrogen-rich substrates → Tlow process.
The resulting biogas is collected either in the flexible, gas-tight cover directly above the substrate or in external gas storage facilities.
The utilization of the biogas takes place in a CHP (combined heat and power) plant, where it is used to power a combustion engine for the generation of electricity and heat.
Alternatively, the biogas can be processed to achieve the quality of natural gas (biomethane) in a complex gas treatment unit. Biomethane can then be fed directly into the natural gas grid or compressed and used as vehicle fuel.
The used substrate from the fermenter is first deposited in the fermentation residue store. From here, it is finally used as a high-quality biological fertilizer. The fermentation residue can also be separated and dried.
Advantages of biogas
- Regenerative energy production using residual material from agriculture, the food industry and sewage works
- Electricity and heat production
- Flexible electricity generation according to requirements around the clock, independent of wind and sunshine
- Fermentation residue is a valuable fertilizer and replaces mineral fertilizers
- Biogas can be stored and transported
- Biogas is regional, also in terms of value creation
- Biogas provides independence
- Low workload through well-developed automation
- Modular extendability at any time through standardized components
- Compact container-based construction leading to space savings
- Short construction time through pre-assembled units