H2S smells like rotten eggs. The benefit is: once you smell it you know that you have a leakage. On the other hand, as already described, its smell is total unpleasant. Another downside is that intermediate gas compressor for Biogas CO2 Scrubbing will not last for very long.
On a DIY small scale level H2S could be removed by letting the biogas pass through a "bubbler" bottle which contains steel wool. The chemical reaction as follows[http://iicbe.org/siteadmin/upload/3607C414016.pdf] Removal of Hydrogen Sulfide from Biogas using Dry Desulfurization Systems:
2Fe2O3 + 6H2S -> 2Fe2S3 + 6H2O
Iron oxide reacts with hydrogen sulfide forming iron suflide
2Fe2S3 + 3O2 -> 2Fe2O3 + 6S
The iron sulfide then reactions with oxgen to iron oxide.
http://permaculturewest.org.au/ipc6/ch08/shannon2/index.html H2S Scrubbing described by Permaculture West