Question

Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called ______
a) primary treatment
b) secondary treatment
c) final treatment
d) amplification

Answer 1

Dear Murtaza,

◆ Answer -
Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called *primary treatment*.

● Extra information -
Sewage treatment is done in following steps -
1) Preliminary treatment -
- Includes screening, grit removal, pre-aeration
2) Primary treatment -
- Includes sedimentation & floatation
3) Secondary treatment -
- Includes sedimentation & biological treatment
4) Advanced treatment -
- Includes multimedia filtration, biological nutrient removal

Hope this helps you. Thanks for asking..

Answer 2

Answer:

The correct answer is A, Primary Treatment.

Step by Step Explanation:  

Primary Treatment is the removal of large pieces of floating debris, oily substances, etc. during sewage treatment.  

There are four steps involved in sewage treatment. First is Preliminary Treatment which includes grit removal, screening etc. Second is Primary Treatment, Third one is Secondary Treatment which includes sedimentation and biological treatment. Fourth one is Advanced Treatment which involves filtration, biological removal of nutrients, etc.