Which of the following is/are products of wastewater treatment?

The correct option is C

Both biogas and sludge

The correct option is C.

The explanation of the correct option:

1. Wastewater treatment is a process to remove contaminants from the wastewater.
2. Wastewater is collected and passed through a screen bar from there large waste material is removed.
3. Water is passed to the grit and sand removal tank. Water speed is slowed to settle sand at the bottom.
4. Solid waste materials are discarded by the scraper.
5. Air is pumped into this waster for aeration and aerobic bacteria are allowed to grow and waste is consumed by these bacteria.
6. Surface water is then passed to rivers and oceans.
7. This sludge and biogas are products of wastewater treatment.

The explanation of the incorrect option:

Option A

Sludge is produced during wastewater treatment. Biogas is also produced.

Option B

Biogas production decreases the water pollution by oxygen level needed by organic material. both biogas and sludge are produced during wastewater treatment.

Option D

An aerator is a mechanical device used for the aeration and allows the mixing of air.

Final answer: Biogas and sludge are products of wastewater treatment.