Question

Which of the following is/are products of waste water treatment ?
1. Biogas
2. Sludge
3. Both biogas and sludge
4. Aerator

Answer 1

Correct Answer - Option 3 : Both biogas and sludge

The correct answer is Both biogas and sludge.

• Biogas and sludge are the products of wastewater treatment.
• The biogas forms due to the microbial degradation of the waste and sludge are the end by-product of the wastewater treatment.
• The main by-product from wastewater treatment plants is sewage sludge which is usually treated in the same or another wastewater treatment plant.
• Biogas can be another by-product if anaerobic treatment processes are used.

• Anaerobic respiration - Anaerobic respiration is respiration using electron acceptors other than molecular oxygen. 
• Aerobic respiration - It is the process of cellular respiration that takes place in the presence of oxygen gas to produce energy from food.