AQA Trilogy Chemistry - C12 The Earth's Resources

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Finite Resources

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9 Terms

1

Finite Resources

  • resources that will run out if we exploit them

  • e.g. fossil fuels

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2

Renewable Resources

  • can be replaced as we use them

  • e.g. biofuels

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3

Potable Water

  • water safe to drink

<ul><li><p>water <mark data-color="purple" style="background-color: purple; color: inherit">safe to drink</mark> </p></li></ul><p></p>
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4

Distilliation

  • liquid is heated into a gas and then condensed

  • can be an expensive process due to the large amounts of energy required to heat it

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5

Desalination

  • converting salty water to potable, useable water by removing dissolved mineral salts from water

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6

Reverse Osmosis

  • membranes are used to separate dissolved salts from salty water

  • the membranes can remove 98% of dissolved salts from seawater

  • no heating required

  • energy still required to make the high pressures needed

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7

Sewage Treatment

  • screening - large solid objects are removed

  • primary treatment - solid sediments settle out from the mixture and the sludge is piped to a storage tank for further treatment

  • secondary treatment - useful bacteria feed on an remaining organic matter and harmful microorganisms and break them down aerobically, then the tank is aerated

  • final treatment - the useful bacteria settle at the bottom of the tank and removed

<ul><li><p>screening - large solid objects are removed</p></li><li><p>primary treatment - solid sediments settle out from the mixture and the <mark data-color="purple" style="background-color: purple; color: inherit">sludge</mark> is piped to a storage tank for further treatment</p></li><li><p>secondary treatment - <mark data-color="purple" style="background-color: purple; color: inherit">useful bacteria</mark> feed on an remaining organic matter and harmful microorganisms and break them down <mark data-color="purple" style="background-color: purple; color: inherit">aerobically</mark>, then the tank is aerated</p></li><li><p>final treatment - the useful bacteria settle at the bottom of the tank and removed</p></li></ul><p></p>
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8

Treating Sewage Sludge

  • it is digested anaerobically by microorganisms

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9
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