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

Related Mcqs:

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

   A. Filtration
   B. Digestion
   C. Sedimentation
   D. Both B. and C.

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

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

5. In water treatment plant, zeolite process is used to remove the _____________ of water?

   A. Acidity
   B. Alkalinity
   C. Hardness
   D. Iron & zinc

6. 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

7. 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

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

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

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

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

10. BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

    A. 1-2
    B. 5-10
    C. 150-300
    D. 2000-3000