The pH value of oxidised sewage is about_____________________?

Related Mcqs:

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

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

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

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

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

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

4. Fresh sewage is ______________ in nature?

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

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

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

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

   A. 1-2
   B. 5-10
   C. 90-120
   D. 1500-2500

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

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

8. 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

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

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

10. 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