Chemistry 10 - Potable Water, Waste Water Treatment, Using Earths Resources and Life Cycle Assessments 😒

What is the definition of Potable water? 💧

Water that is safe to drink

What are the 2 steps in making potable water from FRESH water and why 💧

• Filtration - removes large insoluble molecu;es and waste

• Sterilisation - kills pathogens

What are the 2 steps in making potable water from SALT water 🌊

• Distillation - Heat, evaporate, cool, condense

• Reverse osmosis

  It is also filtered and sterilised like fresh water

What are the 4 steps in making potable water from WASTE water? 🗑

• Filtration

• Sedimentation - heavy organic matter sinks to the bottom

• Digestion using microbes

• Sterilisation

What does finite (non renewable) mean?

A resource with a limited supply and so will eventually run out

What does renewable mean?

Can be used again and again, something that can be remade / regrown at a similar rate to global consumption

‼RAW MATERIALS‼

• Plastic bags

• Paper bags

• Processed crude oil

• Made from wood (deforestation)

‼MANUFACTURING‼

• Plastic bags

• Paper bags

• Has to be 1500 degrees C

• Has to be 800 degrees C

‼USE AND OPERATION‼

• Plastic bags

• Paper bags

• Use up to 10 times

• Use twice

‼DISPOSAL‼

• Plastic bags

• Paper bags

• Can be re-used, recycled, if placed at a landfill it will NOT decompose

• Can be recycled, WILL decompose at a landfill

‼EMISSIONS AND WASTE‼

• Plastic bags

• Paper bags

• Releases carbon dioxide and other toxic gases during production

• releases carbon dioxide during production and reduces the number of trees able to produce carbon dioxide

‼GCSE PAST QUESTION‼

Explain how distillation can be used to obtain potable water

Water is heated to create steam through evaporation. The steam is then cooled and condensed back into liquid, leaving behind impurities. Different substances have different boiling points, water has a lower boiling point than most contaminents.