What kind of waste can be used to make biogas on a large scale?
Waste from sugar factories and sewage works
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Smaller Biogas generators are used for what?
Energy used for family or farm. They collect waste from kitchens or livestock.
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Larger biogas generators are used for what?
Used for small village or community
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What does the production of biogas depend on?
Temperature of the fermenter (bacteria works best at warm temperatures, however too warm and their enzymes denature.), Rate of fermentation and type of waste used.
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Advantages of biogas...
Carbon neutral fuel and useful for LEDC's which don't have enough energy
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Disadvantages of biogas...
Still releases carbon dioxide when transported etc. and if air gets into the generator the bacteria will respire anaerobically creating carbon dioxide which is less efficient
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What do biogas generators need?
A way to get the waste material in, a way of removing the digested waste material (which can be used for fertiliser) and finally a way of removing the biogas and transporting it.
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Explain what happens in the biogas generator ...
Waste material is put in the tank with the bacteria in aerobic conditions, it is left to ferment until all of the gas has been produced. The gas is collected, then the tank is cleaned and refilled. The digested waste material is used for fertiliser.
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Advantages of generators...
Useful for small scale productions and can be cleaned easily if contaminated
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Disadvantages of generators...
Takes time and energy to set up, Can take up to four weeks for the methane to be produced, only small patches of biogas produced
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What is a continuous generator?
Waste material is continuously added to the generator to 'top up' gas prduction, The gas is then collected, this happens for a long time without a gap in production, The digested waste can be used for fertiliser.
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Advantages of continuous generators...
Continuous production means generator doesn't have to shut down,Methane is produced all of the time, Constant use of waste materials
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Disadvantages of continuous generators...
More expensive to set up as it is more complex, needs a continuous feed of waste, large amounts of gas need storing, cant control the temperature so it slower in winter.
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Other cards in this set
Card 2
Front
How is biogas made?
Back
Anaerobic fermentation of waste materials
Card 3
Front
What kind of micro-organisms are involved?
Back
Card 4
Front
What kind of waste can be used to make biogas on a large scale?
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