A) Primary treatment
B) Secondary treatment
C) Tertiary treatment
D) Reverse osmosis stage
Correct Answer: B
Solution :
[b] Sewage water can be treated to remove polluting matter by three stages (i) primary treatment involves physical process of removing the suspended matter (ii) secondary treatment involves biological treatment (iii) tertiary treatment involves remove phosphate, nitrate and sulphate from the water.You need to login to perform this action.
You will be redirected in
3 sec