Question

removal of large pieces of floating derbis, oily substance, etc. during sewage treatment is called​

Answer 1

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..