01
Composition
Once the required feedstock mix is prepared, it is pumped into the fermentation tanks.
Energy Generation
Biogas
Biogas is produced through the breakdown of organic matter in the absence of oxygen — a process known as anaerobic digestion.
What is biogas?
It works like a big concrete stomach
Organic materials like manure, food scraps, crop residue or wastewater sludge (feedstock) are fed into the digester, heated to 38–40 °C (the temperature of a cow's stomach) and stirred for 30–60 days, slowly producing a mix of methane, carbon dioxide and other gases — biogas.
The biogas can then be used for power generation, heating or injection into the natural gas grid. Once production is complete, the waste has turned into a high-quality fertilizer (digestate); after it is removed the process starts again.
Biogas composition
| Gas | % |
|---|---|
| Methane (CH₄) | 55 – 70 |
| Carbon dioxide (CO₂) | 30 – 45 |
| Hydrogen sulfide (H₂S), hydrogen (H₂), ammonia (NH₃) | 1 – 2 |
| Carbon monoxide (CO) | trace |
| Nitrogen (N₂) | trace |
| Oxygen (O₂) | trace |
Biogas production
A three-stage biochemical process run by microorganisms
Biogas production is a complex biochemical process involving microorganisms with different roles.
1Hydrolysis
Complex organic substances are broken down into simple structures by fermentative and hydrolytic bacteria.
2Acid production
Hydrolysis products are converted into organic acids by acetogenic bacteria.
3Methane production
In the final stage, products of the previous two stages are converted into methane by methane-forming bacteria.
Inside the plant
From feedstock to energy in 8 steps
02
Fermentation
Fermentation starts when the heating unit brings the mix to about 38 °C (mesophilic).
03
Gas
A membrane and gas-storage frame are fitted on the fermenter; the biogas produced is stored in the membrane system.
04
Storage
After fermentation, the organic fertilizer is transferred to the storage tank by the central pump.
05
Separation
A separator splits the organic fertilizer into solid and liquid phases.
06
Desulphurisation
The gas is sent to the desulphurisation unit to remove hydrogen sulfide.
07
Conversion
Desulphurised biogas with 50–60% methane is fed to the gas engine, which converts it into electricity and heat.
08
Heating
Part of the heat from the gas engine is used to heat the fermentation tanks.
- Electricity and heat (CHP) generation
- Can be injected into the grid as biomethane
- High-quality organic fertilizer as by-product
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