Question

Fill in the blanks.

(iii) Tertiary treatment in an effluent treatment plant involves _________ process.

Answer 1

1. In the tertiary treatment top layer of water is removed to remove the phosphorus and nitrogen present in the water.
2. To kill the germs, compressed air is passed through it, along with disinfectants like chlorine and ozone gas.
3. Finally, the cleaned water is reintroduced into natural bodies of water such as lakes and rivers.

Tertiary treatment in an effluent treatment plant involves Final cleansing and disinfection process.