Question

Name the two bi-products of wastewater treatment.

Answer 1

The two bi-products of wastewater treatment are compost and biogas.

Compost:

• The solid wastes that settle at the bottom in the primary treatment of water are called sludge, which mainly consists of human and animal faeces, and fruit and vegetable wastes.
• This sludge can be dried and used as organic compost.

Biogas:

• In the secondary treatment of water, the organic matter in the sludge is broken down with the help of bacteria and as a result of this process, biogas is produced.
• Biogas can be used either as fuel or to generate electricity.