Question

Don't explain The last step in waste water treatment. is. process options are here tell which is this answer
a). Biological
b). Mechanical
c). Chemical
d). Physical​

Answer 1

I think the answer is

d. physical

I hope it is helpful for you

Answer 2

The last step in waste water treatment is ____ process

a). Biological

b). Mechanical

c). Chemical ✓✓

d). Physical

The process Name is Sedimentation which is done by the chemicals