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How to convert RNG to CNG?

Renewable natural gas (RNG) is a type of biogas that is produced from the decomposition of organic matter such as landfill waste, animal waste, or agricultural waste. RNG can be upgraded to meet the same specifications as compressed natural gas (CNG) and used as a transportation fuel. Here's a brief overview of the process for making RNG into CNG:

RNG collection: The RNG is collected from its source, such as a landfill or dairy farm, and transported to a processing facility.

RNG purification: The RNG is purified to remove impurities such as water, hydrogen sulfide, and other trace contaminants that could damage natural gas vehicle engines.

RNG compression: The purified RNG is compressed to the desired pressure, typically between 3,000 and 3,600 psi, to create CNG.

CNG storage: The CNG is stored in high-pressure storage tanks until it is ready to be used.

Dispensing: The CNG is dispensed into natural gas vehicles or stored for later use.

There are a few different methods for purifying RNG to meet CNG standards, including pressure swing adsorption, water scrubbing, and membrane separation. Each method has its own advantages and disadvantages in terms of efficiency, cost, and environmental impact.

It's worth noting that the production of CNG from RNG is a relatively small-scale industry, and the infrastructure for distributing and dispensing CNG is not as widespread as that for gasoline or diesel fuel. However, there are growing efforts to expand the use of CNG as a transportation fuel, particularly in the commercial and municipal vehicle sectors, and there are now many public CNG fueling stations available in some regions.

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