Maybe I should have said "interesting" instead of "funny". Of course, the reason I know about H2S in sewage is that I was in charge of all the water and sewage

Maybe I should have said "interesting" instead of "funny". Of course, the reason I know about H2S in sewage is that I was in charge of all the water and sewage piping systems on my first ship. Including safe re-entry and emergency response to leaks. So, yes, I'm quite aware of the hazard presented by H2S. I wouldn't advocate running it residentially, but perhaps in high power low voltage situations like inside a power plant, or major substations, it might make sense.