In bio methane, the percentage of carbon dioxide is

The correct option is 32-43.

Biomethane, also known as purified biogas, is a renewable source of energy produced through the anaerobic digestion of organic matter (such as agricultural waste, manure, municipal waste, and sewage). Raw biogas primarily consists of methane (CH₄) and carbon dioxide (CO₂), along with trace amounts of other gases like hydrogen sulfide, nitrogen, and water vapor.

During the upgrading process to convert raw biogas into biomethane, most of the carbon dioxide and impurities are removed to enrich the methane content, making it comparable to natural gas. Typically, in processed biomethane, the methane content is elevated to about 90% or higher, while the percentage of remaining carbon dioxide (CO₂) is significantly reduced. However, depending on the feedstock and the specific efficiency of the biogas upgrading technology used, the typical percentage of carbon dioxide in raw biogas before full upgrading ranges from 30% to 45%. Among the given choices, the range of 32-43% accurately represents the typical concentration of carbon dioxide found in biogas during the transition phases of biomethane production.