Poultry Judging Practice Test

During biogas production, what percentage of methane, the desired gas, is produced from manure?

1. 50-60%

2. 40-50%

3. 60-70%

4. 30-40%

The correct answer is: 60-70%

The production of biogas from manure is a well-studied process where various factors influence the composition of the resulting gas. Methane is the primary component of biogas and is highly valued for its energy content. In the context of manure-based biogas production, the range of 60-70% methane is commonly recognized as the typical output level for optimal anaerobic digestion processes. This percentage is significant because it indicates a high yield of methane relative to other gases like carbon dioxide and hydrogen sulfide, which are also produced during digestion. Methane levels in this range suggest efficient microbial activity, temperature control, and nutrient balance within the digester, all of which contribute to maximizing methane production. Understanding the characteristics of biogas production helps in evaluating the efficiency of the anaerobic digestion process when utilizing different types of organic waste, including manure. In this case, aiming for a methane concentration of 60-70% demonstrates an effective conversion of organic matter into high-energy fuel, which is essential for both energy applications and environmental benefits, such as reducing greenhouse gas emissions compared to open manure storage.