Test protocol biogas composition determination (version 2.1)

Determining the composition of biogas requires either laboratory equipment or a handheld biogas analyser. This equipment typically measures CH4, CO2, O2 and H2S in a fast and accurate way but it is expensive to buy (starting at approx 3000 USD) and need regular calibration by a certified supplier.
Somehow, this equipment is never available when you most need it.
This document describes an alternative, low tech testing method using a caustic soda (NaOH, sodium hydroxide) solution to capture the CO2 in the biogas and estimates of the water vapour contents. The principle is not new: it has been described earlier in articles on the internet1 and there are toolkits available for this purpose2. However, an accurate test using easy‐to‐find gear was not available yet.

Author name
Report subject