PMT: c10

• USING EARTHS RESOURCES

  • we use them for warmth, shelter, food & transport
  • finite resources from the earth are processed to provide energy & material
• SUSTAINABLE DEVELOPMENT

  > meeting current needs without compromising accessibility to future generations

  • chemistry plays an important role in improving agricultural and industrial processes sustainably
  • renewable energy resources: sources of power that quickly replenish themselves & can be used again
  • finite resources: limited supply that will run out
• POTABLE WATER

  > water that is safe to drink

  • NOT pure because it has DISSOLVED SUBSTANCES
  • to be safe enough to drink it needs low levels of dissolved salts & microbes
• POTABLE WATER PROCESS

  • method used to produce potable water depends on available supplies of water & local conditions

  1. appropriate source of fresh water is selected ( rain gives water with low levels of dissolved substances, collected in rivers)
  2. water is passed through FILTER BEDS to remove DIFFERENT SIZED INSOLUBLE SOLIDS
  3. water is STERILISED, to kill microbes, with either ozone, UV or chlorine
• POTABLE WATER PROCESSES

  > if sea water is available, DESALINATION is required orrrr with membranes (reverse osmosis)

  • BOTH are very EXPENSIVE
• WASTE WATER TREATMENT

  • water of the correct quality is needed for life; must be free of poisonous salts & harmful microbes