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You could bake it at that temp for an hour, or you could put it into an old, but clean, pillowcase and steep it in a pot of 140-170 degree water for an hour. Earthworm castings may not need pasturization, but it would probably be a good idea considering how little work seems to have been done with it as a mushroom substrate. As with compost or manure, you want the final moisture level to the point where you can just get a few drops of water out of sqeezing a handful in your fist.
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