JIPMER2009ZoologyMicrobes in Human Welfare
In the treatment of waste water discharge, which treatment stage involves biological treatment?
Options
- APrimary treatment
- BSecondary treatment
- CTertiary treatment
- DReverse osmosis stage
Correct answer
B. Secondary treatment
Step-by-step solution
During waste water treatment : (a) Primary treatment involves physical process of removing the suspended matters. (b) Secondary treatment involves biological treatment. (c) Tertiary treatment involves the removal of phosphate, nitrate and sulphate.