- QUESTION 01 :
What is biogas?
Biogas is a byproduct of the decomposition of organic matter by anaerobic bacteria.
- QUESTION 02 :
How does it work?
Organic waste is put into a sealed tank called a digester (or bioreactor) where it is heated and agitated. In the absence of oxygen, anaerobic bacteria consume the organic matter to multiply and produce biogas.
- QUESTION 03 :
What type of waste produces biogas?
Any organic waste has the ability to produce biogas: human excreta, manure, animal slurry, fruit and vegetable waste, slaughterhouse waste, meat packing waste, dairy factory waste, brewery and distillery waste, etc.
Fiber rich wastes like wood, leaves, etc. make poor feedstocks for digesters as they are difficult to digest.
- QUESTION 04 :
How much biogas can I get out of my waste?
The amount of biogas you can extract from your organic waste depends on the waste itself and the design of the digester system.
It all depends on waste quality, digester design and proper operation of the system.
- QUESTION 05 :
Where is biogas produced?
Biogas is normally produced in nature by the anaerobic degradation of organic waste in soil, marshes, ocean, etc.
Biogas is also produced in landfills where organic food waste degrades in anaerobic conditions.
Biogas can be produced in anaerobic digesters. These are equipments (tanks) providing full control of the process and ensuring full biogas recovery.
- QUESTION 06 :
Since methane is a potent greenhouse gas, isn’t it stupid to produce biogas?
Methane has a greenhouse gas (GHG) heating factor 21 times higher than CO2.
Combustion of biogas converts methane into CO2 and reduces the GHG impact by over 20 times.
By extracting methane out of waste and using it to produce heat and/or electricity we ensure that the waste will not degrade in an open environment therefore reducing direct methane atmospheric emissions. Moreover, the energy provided by the biogas is likely to displace fossil fuel which is the main contributor to GHG emissions.
Biogas energy is considered carbon neutral, since carbon emitted by its combustion comes from carbon fixed by plants (natural carbon cycle).
- QUESTION 07 :
How much energy is in biogas?
Each cubic meter (m3) of biogas contains the equivalent of 6 kWh of calorific energy.
However, when we convert biogas to electricity, in a biogas powered electric generator, we get about 2 kWh of useable electricity, the rest turns into heat which can also be used for heating applications.
2 kWh is enough energy to power a 100 W light bulb for 20 hours
- QUESTION 08 :
What happens to the waste after digestion?
Despite popular belief, the amount of waste going in the digester is almost equal to the amount coming out. However the quality of the waste is altered for the better (less odor, better fertilizer, organic load reduced, less polluting) Waste coming out of the digester can be separated (solid/liquid):the solid part can be composted and the liquid part can be used as liquid fertilizer or can be treated further and disposed.
- QUESTION 09 :
So why make biogas?
It always costs money to get rid of waste. If it doesn’t cost you anything, you are probably creating an environmental hazard.
- QUESTION 10 :
How much does it cost and How much can I make?
Biogas plants can take various shapes and forms.Every production different
- QUESTION 11 :
How difficult is it to run a biogas plant?
A biogas plant is like an animal. You must feed it every day and feed it the right stuff in the right amount. Just like an animal if you don’t take good care of it, it will become ill and will yield poor results.