Purifying water Flashcards
1
Q
What are the four main sources of water?
A
- Rivers
- Lakes
- Reservoirs
- Aquifers
2
Q
How does the chemical industry use water?
A
- As a coolant
- As a solvent
- As a raw material
3
Q
What are the three stages of water treatment?
A
- Sedimentation
- Filtration
- Chlorination
4
Q
What happens during sedimentation?
A
The water settles to allow insoluble particles to sink
5
Q
What happens during filtration?
A
Sand is used to remove the very fine particles
6
Q
What happens during chlorination?
A
Chlorine is used toe kill the microorganisms in the water
7
Q
What pollutants are found in water?
A
- Nitrates from fertilisers
- Lead compounds from plumbing pipes
- Pesticides
