What is Biomethane

The typical composition of raw biogas does not meet the minimum CNG fuel specifications. In particular, the COand sulfur content in raw biogas is too high for it to be used as vehicle fuel without additional processing. Biogas that has been upgraded by removing H2S, moisture and carbon dioxide is known as biomethane.

Biomethane is less corrosive than biogas, apart from being more valuable as a fuel. Since production of such fuel typically exceeds immediate on-site demand, the biomethane must be stored for future use, usually either as compressed biomethane (CBM) or liquefied biomethane (LBM).

Biomethane can be liquefied, creating a product known as liquefied biomethane (LBM). Two of the main advantages of LBM are that it can be transported relatively easily and it can be dispensed to either LNG vehicles or CNG vehicles. Liquid biomethane is transported in the same manner as LNG, that is, via insulated tanker trucks designed for transportation of cryogenic liquids.

Biomethane can be stored as CBM to save space. The gas is stored in steel cylinders such as those typically used for storage of other commercial gases. Storage facilities must be adequately fitted with safety devices such as rupture disks and pressure relief valves. The cost of compressing gas to high pressures between 2,000 and 5,000 psi is much greater than the cost of compressing gas for medium-pressure storage. Because of these high costs, the biogas is typically upgraded to biomethane prior to compression.

Biomethane is more flexible in its application than any other renewable source of energy. Its ability to be injected directly into the existing natural gas grid allows for energy-efficient and cost-effective transport. This allows gas grid operators to enable consumers to make an easy transition to a renewable source of gas. The diverse, flexible spectrum of applications in the areas of electricity generation, heat provision, and mobility creates a broad base of potential customers.

Biomethane can be used to generate electricity and heating from within smaller decentralized, or large centrally-located combined heat and power plants. It can be used by heating systems with a highly efficient fuel value, and employed as a regenerative power source in gas-powered vehicles. The utilization of biomethane as a source of energy is a crucial step toward a sustainable energy supply.

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About the Author 

Salman Zafar is a renowned expert in waste management, biomass energy, waste-to-energy and sustainable development. He is proactively engaged in creating mass awareness on renewable energy, waste management and environment.
Salman is the CEO of BioEnergy Consult, apart from being the Founder of Cleantech Solutions and EcoMENA.
Salman has successfully accomplished a wide range of projects in the areas of biogas technology, biomass energy, waste-to-energy and solid waste management. He has participated in numerous national and international conferences and has authored many articles in reputed journals and magazines.
Salman can be reached at salman@bioenergyconsult.com or salman@cleantechloops.com.

One thought on “What is Biomethane

  1. Biomethane is the term given to processed digester methane. In the UK, meaning that it meets the minimum standards to be injected into the gas main. Besides dewatering the gas and removing H2S, some propane is injected to improve the net CV and that each KWhr of this renewable energy gas can be certified for use when injected into the grid and then accounted for when used elsewhere in the system. Green energy subsidies can then be claimed when the biomethane gas is used in conventional gas fired systems.

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