Question

4. The last step in waste water treatment is a
process
(a) biological D
(b) mechanical
(c) chemical
(d) physical​

Answer 1

Explanation:

This is done fo primary reasons: to keep the water clean, and to prevent the grit from causing damage to the equipment used in wastewater treatment. The last step of primary treatment involves sedimentation, which causes the physical settling of matter.

Answer 2

Explanation:

The last step in waste water treatment is a

process :-

a) BIOLOGICAL

⛔ NONEXISTENT ⛔