I don't have any experience with the biodenitrator but can I do know a little bit about H2S from the job. 10 ppm is the maximum concentration you can be exposed to during an 8 hour work day, so H2S is not a great risk at that level, but with the smell at that level your wife and family may be! 100 ppm will cause watery eyes, respiratory problems and nausea, and 200 ppm gets you close to the death range within hours. Above 500 ppm your life span is minutes and at 700ppm death is almost immediate. It is nasty stuff and kills a few people in the oil industry every year.
As you mention, H2S is detectable at very low levels but is very toxic and will collect in low spots so for me personally it's a piece of equipment that I would only use if the worst case H2S production rate is low, the area is well ventilated to the outside and you can check up on the equipment frequently.
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