Question

what is this subject?

Answer 1

research it :)

Answer 2

um

Answer 3

lol

Answer 4

i really don't know

Answer 5

what is activated sludge

Answer 6

oh!

Answer 7

i just found out

Answer 8

it's this

Answer 9

Activated sludge refers to a mass of microorganisms cultivated in the treatment process to break down organic matter into carbon dioxide, water, and other inorganic compounds.

Answer 10

it is on google

Answer 11

if you type Activated sludge

Answer 12

its a type of water treatment process..