Valorizing waste iron powder in biogas production: Hydrogen sulfide control and process performances.

Biogas is composed of different gases including hydrogen sulfide (HS), which is a hazardous gas that damages pipes and generators in anaerobic digestion system. The objective of this study was to control HS by waste iron powder produced by laser cutting machine in a steel and iron industry. Waste iron powder was mixed with dairy manure at a concentration between 2.