Digester gas contains approximately what percentage of methane?

Digester gas, which is produced during the anaerobic digestion of organic materials in wastewater treatment plants, is primarily composed of methane and carbon dioxide, with smaller amounts of other gases. The correct percentage of methane in digester gas typically falls in the range of approximately 55% to 70%. However, the most commonly referenced approximation for methane content is around 65%.

This high percentage of methane makes digester gas a valuable energy source, as methane is a potent fuel that can be harnessed for heating, electricity generation, or even as a vehicle fuel. Understanding the composition of digester gas is crucial for optimizing its processing and utilization in energy generation systems. The accurate measurement of methane content helps in evaluating the efficiency of the digestion process and ensuring that the gas is being used effectively.

This context solidifies the understanding of why 65% is a reasonable estimate for the methane content in digester gas, supporting its selection as the correct answer in this question.