How is carbon dioxide formed from a mixture of sewage microorganisms and air?

Answer 1

The bacteria digests the nutrients from the sewage and like humans, uses respiration to produce air and water. In this air there is CO2 (Carbon Dioxide).

Answer 2

In a sewage treatment process, microorganisms break down organic matter present in the sewage through respiration. As they respire, they release carbon dioxide as a byproduct. This carbon dioxide is formed when the organic compounds in the sewage are broken down and their carbon content is released into the environment as CO2.

Answer 3

Carbon dioxide dissolved in water form carbonic acid.