During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?

Related Mcqs:

1. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?

   A. CO2 B. CH4 C. CO D. H2...

2. ____________ substances present in sewage are removed in grit chamber during sewage treatment?

   A. Organic B. Fatty C. Inorganic D. Dissolved...

3. Fine grit present in sewage is removed in the _____________ during sewage treatment?

   A. Grit chamber B. Detritus tank C. Trickling filter D. Skimming tank...

4. The function of skimming tank in sewage treatment is to remove _____________ substances?

   A. Dissolved solid B. Suspended solid C. Oil & fatty D. Gritty & inorganic...

5. The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?

   A. Anaerobic B. Saprophytic C. Aerobic D. Parasitic...

6. Which of the following processes is involved in the biochemical treatment of sewage effluents ?

   A. Oxidation B. Reduction C. Dehydration D. Fermentation...

7. In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

   A. 1 to 2 B. 4 to 5 C. 9 to 10 D. 15 to 20...

8. In sewage treatment, its sedimentation is speeded up by commonly adding__________________?

   A. Hydrochloric acid B. Lime C. Copper sulphate D. Sodium sulphate...

9. A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?

   A. -1.87 B. 0 C. 1.26 D. 3.91...

10. Fresh sewage is ______________ in nature?

    A. Acidic B. Neutral C. Alkaline D. Highly acidic...