Match the items in List 1 (Operation problem) with List 2 (Water/Wastewater treatment) and select the best answer using the codes.
|
List 1 |
List 2 |
|
A. Sludge bulking |
1. Rapid gravity filter |
|
B. Negative head |
2. Anaerobic sludge digester |
|
C. pH reduction |
3. Trickling filter |
|
D. Fly breeding |
4. Activated sludge process |
1
1 – B, 2 – C, 3 – D, 4 - A
2
1 – C, 2 – A, 3 – D, 4 - B
3
1 – B, 2 – D, 3 – C, 4 – A
4
1 – C, 2 – B, 3 – D, 4 - A