The detention period for plain sedimentation water tanks, is usually____________________?

Related Mcqs:

1. The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?

   A. 25,000 to 35,000 litres/sqm/day B. 40,000 to 50,000 litres/sqm/day C. 50,000 to 60,000 litres/sqm/day D. 80,000 to 100,000 litres/sqm/day...

2. The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________?

   A. 204 cu.m B. 208 cu.m C. 212 cu.m D. 216 cu.m...

3. The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?

   A. 25,000 to 35,000 litres/sqm/day B. 40,000 to 50,000 litres/sqm/day C. 50,000 to 60,000 litres/sqm/day D. 80,000 to 10,000 litres/sqm/day...

4. The maximum depth of sedimentation tanks, is kept__________________?

   A. 3 m B. 3.5 m C. 4 m D. 4.5 m...

5. The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?

   A. 25,000 to 35,000 litres/sqm/day B. 40,000 to 50,000 litres/sqm/day C. 50,000 to 60,000 litres/sqm/day D. 80,000 to 100,000 litres/sqm/day...

6. The recommended detention period for grit chambers is_______________?

   A. 1 minute B. 2 minutes C. 3 minutes D. 5 minutes...

7. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________?

   A. 5 m B. 5.5 m C. 6.5 m D. 7 m...

8. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?

   A. 16 m B. 20 m C. 24 m D. 30 m...

9. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?

   A. 30 minutes B. 1 hour C. 1 hour and 30 minutes D. 2 hours...

10. The digested sludge from septic tanks, is removed after a maximum period of__________________?

    A. 3 years B. 3.5 years C. 4 years D. 5 years...