2. What is biogas?
• A mixture of methane
and carbon dioxide
CH4
CO2 • Methane or ‘swamp gas’,
produced naturally in
swampy ponds
What is this?
3. What is it used for?
• Biogas is a fuel used as an
energy source for light, heat
or movement
4. Biogas is produced by the breakdown of
organic waste by bacteria without oxygen
(anaerobic digestion or fermentation).
How is it made?
Leftover food from houses, shops, restaurants and
factories
Cow, sheep and chicken manure
5. Biogas is made by fermenting organic waste in a
biogas digester.
Digesters vary from small household
systems…
How is it made?
10. Finding more information about bio gas plant manufacturers you
can visit at and can get complete information about it.
http://www.tradeindia.com/manufacturers/biogas-plant.html
Editor's Notes
Molecules: Wikimedia Commons Public Domain; Methane gas from Minnesotas for Sustainability
Molecules: Wikimedia Commons Public Domain; Methane gas from Minnesotas for Sustainability
Biogas Train image by Amanda i Linköping 2006 (WikiCommons)
Diagram: Practical Action Technical Sheet on Biogas
Landfill compactor – Wikimedia image released to the Public Domain
Give students the handout and ask them to scan the article for the keywords on the slide. When this has been done, ask students to construct a sentence comparing the Katakwa’s farm plant in Tanzania with the Holsworthy Biogas Plant in Devon using one or more keywords. Share sentences to complete the lesson. e.g. “The Katakwa’s use biogas for cooking and lighting, but the Holsworthy Biogas plant uses it to produce electricity”