Lithium I picked as it's a heavy metal that wouldn't break down per se, though maybe the form it would exist in post-compost would be plenty benign. The sewage

Lithium I picked as it's a heavy metal that wouldn't break down per se, though maybe the form it would exist in post-compost would be plenty benign. The sewage sludge issue I'm unfortunately aware of and have been following due to this case: https://www.mainepublic.org/environment-and-outdoors/2022-02-07/complete-crisis-as-pfas-discovery-upends-life-and-livelihood-of-young-maine-farming-family https://www.mainepublic.org/environment-and-outdoors/2022-02... In my area the majority of contamination is from firefighting foams, and I think in the Bay area there's also a lot in groundwater from semiconductor manufacturing. My understanding is the known way to remove PFCs from soil involves baking at very high temperatures (like 500C) which is impractical at any scale.