water

• potable water is drinkable water with low levels of mineral ions.
• pure water is just made of the compound h20 with no mineral ions and impurities
• one way of producing potable water

  -uk fresh water sources come from rain water , ground water

  reservoirs and aqufiers with already low mineral ions

  -the water is filtered to remove solid particle

  -chlorine is used to kill bacteria , ultraviolet light and ozone can be

  used . flourine is added to prevent tooth decay but too much can cause discolouration
• one way potable water can be produced is

  desalination by reverse osmosis by passing it through membranes or distilation .both are expensive and require alot of energy
• the best way to produce potable water is using filtering fresh water
• one way potable water is produced from waste water

  • screening the water and removal of grit
  • sedimentation tank produces sludge and effluent. sludge is removed/digested by anaerobic bacteria this also creates bio gas which can be burnt for energy also used as fertiliser. the effluent is digested via areobic digestion. air is bubbled through