Iron Sponge
- Removes sulfides
- Iron sponge generally refers to wood chips impregnated with iron oxide
- Upflow/Downflow of gas through packed bed of iron sponge based on provider
- Iron oxide (Fe2O3) reacts with sulfides (H2S) to produce iron sulfide (Fe2S3) and water (H2O): 2 Fe2O3(s) + 6 H2S(g) → 2 Fe2S3(s) + 6 H2O(l)
- Must drain excess water occasionally so as not to flood the bed
- Bed can be regenerated several times before needing replacement
