Quote:
Originally Posted by NorthernSantuary
I didn't understand why the digester output would be toxic.
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It depends what is meant by "toxic." It is a matter of perspective. It would most likely be toxic to humans and most mammals as well as fish, but not to worms, bacteria, some insects, and the like.
Large quantities of waste, human or otherwise, have been know to produce H2S (hydrogen sulfide gas) which is extremely dangerous. I used to have to wear a detector in sour gas plants for just such a reason. H2S is colorless, odorless, and a little heavier than air, so short people suffocate first. It's supposed to be like going to sleep.
I even designed an extraction process so H2S could be removed from the methane for cooking and heating on biomass reclamation units. It's about 98% efficient and doesn't take up too much space.