Feasibility studies are the best way to start biogas projects or biogas business. At reasonable costs, they help to find out whether it makes sense to start a project or a business or how it can be improved.
FBI has made studies all over the world and hence is very experienced.
First Biogas International brings biogas technology, key components and more than 20 years of experience to our partners worldwide. Thanks to our successful business model we can design and adapt biogas plants to specific local needs. With our presence on site we train the staff and transfer essential know-how to ensure sustainable business development.
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Anaerobic digestion is a 4-stages biological and chemical process. Many microorganisms are involved. But the different bacteria prefer a different environment (pH-value, temperature, organic acid concentration, etc) where they can work in a most efficient way.
Therefore, FBI has developed the partial-aerobic hydrolysis pretreatment technology. This means that the first stage of the digestion process, the hydrolysis process, is now a separate process in an extra tank. In that tank, air is injected because only aerobic bacteria can produce the enzyme cellulase. Cellulase can open cellulose and hemi-cellulose from fibrous materials (like grass, straw, green waste, etc.) and turn them into sugar (that is later turned into biogas).
Higher biogas yields
Fibrous organic material with high cellulose and hemi-cellulose contents are digested and turned into sugar and thus more biogas can be produced. Cellulase could be added daily to the fermentation process to increase the gas yield but this is too expensive. The FBI hydrolysis pretreatment allows cellulase forming bacteria (strictly aerobic) to reproduce themselves and thus to produce continuously cellulase, almost for free. So, for fibrous plants (grass, reed, etc.) and dry fibrous biomass (straw, manure with straw, bagasse, etc.) much more biogas can be produced by the digestion of cellulose and hemicellulose.
Higher methane concentration
In the hydrolysis unit most biological processes for the formation of CO2 take place. The CO2 leaves the unit with the exhaust air. Thus, the biogas has a 3-5% higher methane concentration than with a 1-stage fermentation process. This lets CHPs run smoother and helps saving cost on biomethane upgrading plants.
Stable fermentation process
With the separation of the sensitive methane forming process from the acidification process the whole fermentation process runs much more stable.
Less digester volume
Due to the much better environment conditions for the methane bacteria less hydraulic retention time (HRT) is necessary. With the FBI hydrolysis pretreatment process an HRT of 20 to 25 days is enough. Thus, digester volumes can be reduced or more biogas can be produced with the same volume.
Trouble-free hydraulic processes
With the FBI hydrolysis pretreatment technology most of fibrous materials are being liquified and thus pumping and agitating are easier and there are no more floating layers in the digesters.
Thus, more kind of biomass can be digested. Like wheat and corn straw in China. Instead of burning it which results in a high air pollution, FBI’s biogas plants can digest the straw and turn it into biogas and fertilizer.
Typical FBI Chinese biogas plant running with pure corn and wheat straw. The Chinese plants have 1 to 6 hydrolysis tanks (350 m3 each) and up to 8 digesters (up to 8’700 m3 each).
Typical FBI German biogas plant running with manure and corn silage. The German plants have 1 hydrolysis tank (180 m3 each) and up to 3 digesters (up to 2’500 m3 each).
Laoling, China. Biggest Asian biogas plant using FBI’s hydrolysis technology to digest corn and wheat straw. Plant size: 5.5 MW