topic 10
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What is potable water?
: Water that is safe to drink
How is potable water made (UK)? A:
A: Choose water source Filter Sterilise
Name methods of sterilisation
A: Chlorine, ozone, or UV light
: Main stages of sewage treatment? A:
A: Screening (remove large objects) Sedimentation (solids settle) Aerobic bacteria break down waste
What does LCA assess?
A: Environmental impact of a product over its whole life
What stages are included? A:
A: Raw materials Manufacturing Transport Use Disposal
Q: What is corrosion?
A: The destruction of metals by reactions with oxygen/water
What is rusting?
A: Corrosion of iron
: How can you prevent corrosion? A:
A: Barrier methods (paint, oil) Galvanising Sacrificial protection
: Why are fertilisers needed?
A: To replace minerals lost from soil