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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 very long. 1
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 Removal of Hydrogen Sulfide from Biogas using Dry Desulfurization Systems2:
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.
(H2S Scrubbing described by Permaculture West)[http://permaculturewest.org.au/ipc6/ch08/shannon2/index.html]