1. How to identify the CNG production process based on the local energy source?

CNG can be produced :

• or from the exploitation of an underground natural gas deposit;

• or from biomass.

As part of the energy transition, the production of CNG from the exploitation of an underground deposit of natural gas (hence hydrocarbons) is not a recommended process, as it promotes a large amount of CO ₂ emissions undesirable for the fight against global warming. For this practical sheet, we limit ourselves for the remainder solely to explaining the processes involved in producing CNG from biomass.

The first step is to identify the local energy sources that can be exploited, i.e. dry biomass and/or wet biomass for CNG production. Dry biomass is waste with a moisture content of less than 30%. Wet...