First slide

Microbes in Sewage Treatment

Question

What gases are produced in anaerobic sludge digesters?

Easy

A

Hydrogen Sulphide and ${CO}_{2}$
B

Methane and ${CO}_{2}$ only
C

Methane, Hydrogen Sulphide and ${CO}_{2}$
D

Methane, Hydrogen Sulphide and $O_{2}$

Solution

In anaerobic sludge digesters, bacteria which grow anaerobically digest the bacteria and the fungi in the sludge. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.

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