What is a potential safety hazard with anaerobic digestors?

• A. Back harm from heavy lifting
• B. Explosive atmosphere from methane gas
• C. Carbon monoxide poisoning
• D. Drowning during inspection process

Answer: (B)

Anaerobic digesters generate methane gas as organic matter decomposes without oxygen. Methane is highly flammable, and when it mixes with air in the right concentration, it can form an explosive atmosphere. That makes the primary safety hazard the potential for a methane-air explosion in digester areas, especially in enclosed or poorly ventilated spaces. To prevent this, facilities rely on adequate ventilation, continuous gas monitoring with alarms, elimination or control of ignition sources, and proper confined-space entry procedures with gas testing before entry.

Other hazards like back injuries from heavy lifting, carbon monoxide from combustion sources, or drowning during inspection are general workplace risks or less specific to digesters. The distinctive risk here is the explosive atmosphere created by methane gas.