[Phaltan]

We're trying to remove hydrogen sulifde from biogas. We need a way that gives a product that can be easily to turned back to the filter compound via low level heating or basic reactions.
We are considering iron filings and copper (II) sulfate, but are not sure how to regenerate them once they have reacted with the hydrogen sulfide. Heating?

Any help is much appreciated.
Thanks guys

[UnintentionalChaos]

Is the biogas dry, or does it contain water vapor as well? If you inject SO2 into humid H2S (or H2S in Methane as would be the case in biogas), elemental sulfur will form and can be filtered out. In a perfect world, you can burn the sulfur formed in air and make SO2, and reinject it into the system.

2H2S + SO2 -(H2O)-> 2S + 2H2O
             ^               |
             |                v
            SO2 <-----  S + O2

This occurs easily, even at room temperatures as long as water is present, although the equipment to keep it running perfectly would be quite sophisticated. You'd have to test how much H2S was present initially.