Waste Water Engineering Mock Test 4

10%

Question 1 of 10

1. In which type of trickling filter is nitrogen oxidized?

Intermediate filtration rate (Rock type)

Roughing (Plastic/Rock type)

Low or standard filtration rate(Rock type)

High filtration rate (Rock type)

Question 1 of 10

Question 2 of 10

2. For rock type low filtration rate trickling filters what would be the recycling ratio assumed?

1-2

Question 2 of 10

Question 3 of 10

3. What is the depth of washing during high-rate water backwash?

3-6 mm

2-3 mm

1-2 mm

3-4 mm

Question 3 of 10

Question 4 of 10

4. What is the surface area of the River rock (Small) packing material used in trickling filters as the packing medium?

150 m²/m³

60 m²/m³

90 m²/m³

98 m²/m³

Question 4 of 10

Question 5 of 10

5. What is the other name for deflocculation?

Peptisation

Coagulation

Flocculation

Dewatering

Question 5 of 10

Question 6 of 10

6. What is the ratio of Polymer/Phosphate while adding polymer to a waste water in order to remove the phosphates present?

1 : 2

1:3

5:7

3:5

Question 6 of 10

Question 7 of 10

7. For rock type of packing in intermediate filtration trickling filters what is the hydraulic rate considered?

20-25 m³/m².d

10-15 m³/m².d

4-10 m³/m².d

25-30 m³/m².d

Question 7 of 10

Question 8 of 10

8. Calculate the amount of pebbles required for the following data.
Flow: 200 m³/h
Velocity of dual media filter: 15m/h
Height: 0.6 m

15792 Kg

35000 Kg

13792 Kg

12668 Kg

Question 8 of 10

Question 9 of 10

9. Determine the sludge formed from the following set of data.
Specific gravity of sludge: 1.05
Moisture content: 92.5%
Total dry solids: 213.4 kg/1000 m³

2.71 m³/d

3.71 m³/d

2.75 m³/d

2.76 m³/d

Question 9 of 10

Question 10 of 10

10. Alum precipitation occurs at which pH?

1-3

5-7

3-5

7-9

Question 10 of 10