Question

In what way, anaerobic sludge digestion is important in sewage treatments?

Hint:

High BOD = High water pollution. The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water.

Answer 1

In this process, anaerobic bacteria digest the bacteria and fungi present in the activated sludge. This is important because it significantly reduces the sludge volume and produces biogas (a mixture of methane, hydrogen sulfide, and $CO_2$), which can be used as fuel.