WASTEWATER
By Rick Lallish
What color is the waste gas burner on a properly operating anaerobic digester with an approximate mixture of methane 68% and carbon dioxide 32%?
A. Red
B. Orange
C. Blue
D. Green
Answer: C. Anaerobic digestion uses waste gas burners to burn excess gases from the system. It has a continuously burning pilot flame to perform this action safely. Methane-rich gases burn with a blue flame, and gases rich in carbon dioxide burn orange. This is a quick way to visually check your gas content in the anaerobic digester. It is also a safety device to help prevent explosive conditions that arise with volatile
