10.1.3 Waste Water Treatment Flashcards
1
Q
Waste water treatment stages (6p)
A
- Grit removal
- Primary sedimentation tanks
- Aeration
- Final settling tanks
- Sludge treatment
- Burners
2
Q
Step 1: Grit removal
A
Water passes through a series of screens and then a grit channel
3
Q
Step 2: Primary sedimentation tanks
A
The settling tank is used to settle suspended particles in water
4
Q
Step 3: Aeration
A
Oxygen is added to bacteria for treating and stabilising waste water
5
Q
Step 4: Final settling tanks
A
Useful bacteria sinks to the bottom
6
Q
Step 5: Sludge treatment
A
sewage sludge is digested anaerobically by specific bacteria
7
Q
Step 6: Burners
A
The sludge is collected and burnt to create heat, power and electricity
