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What gases are produced in anaerobic sludge digesters?

1. Methane and CO2 only
2. Methane, Hydrogen Sulphide and CO2
3. Methane, Hydrogen Sulphide and O2
4. Hydrogen Sulphide and CO2

Correct answer: Methane, Hydrogen Sulphide and CO2

Solution

In anaerobic sludge digesters, microorganisms break down organic matter without oxygen, producing biogas. This biogas commonly contains methane, carbon dioxide, and hydrogen sulphide, which matches the correct option.

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