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Many
of these materials can be put to a good second use. For example pure
wood waste can be made into chipboard, clean paper and board can be
recycled or made into insulation for buildings.
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| Some types of plastics can be recycled and drinks cans can be made into more drinks cans! |
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What waste materials does your school produce?
What use can they be put to when you've finished with them? |
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Those materials that burn like paper, cloth, rubber and plastic can be used as fuel in 'energy from waste' power stations.
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Is there an energy from waste power station near your school? If there is, can you arrange a visit? |
| Manure
and sewage can be made into a gas containing methane. Certain types of
bacteria do this as they feed on the waste in special air-free tanks
called bio digesters. The mixture of gases produced, called bio gas,
can be burnt in a boiler or used in some engines instead of petrol. |
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A
gas containing methane is also produced when the material in a rubbish
tip decomposes. This landfill gas can be collected, burnt and used to
provide heating or generate electricity.
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