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I'm curious if there's safety issues with it. Like bringing viruses and stuff into the water supply.
I have done zero research on the matter, nor pondered it for more than 2 seconds. But seems like maybe we have been doing this for thousands of years for good reason.
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You are asking correct questions.
When I looked into it there was a bit more than tossing the body in a bin and waiting. The body is mixed in with microbes that will aggressively target soft tissue and break it down. Some mention heat used in the process that would likely kill anything we'd be concerned about. The skeletal remains are removed after several weeks and pulverized mechanically then returned to the compost. The now open pores of the bone can be broken down by the microbes. Nature does this stuff every day and as long as good practices like not dumping the composed remains near water sources, or plant crops for immediate consumption over the compost I dont see how the stuff we would be concerned about would live even a month or two in the soil as they dont have the things they needed to multiply in the body available.
Short news video below discussed the process and shows some scenes of a working facility in WA state.
Behind-the-scenes look at human composting in Washington state