Municipal compost shouldn’t be accepting those items if it’s not heated since it doesn’t break down, nor does it kill pathogens off that can be deadly if used for vegetable gardens.
Heating it in specially designed containers with controlled environments is a little different than the center of the pile getting that hot for a few hours during a hot day.
It’s a stare of the art facility that’s brand new, they’re a little different than most other municipalities.
I’m not saying the facility doesn’t get hot. It is for sure hot. I’m saying it is not the heat that breaks down bones, but the masticators they use.
Without the heat it still takes months to years to break down, with the heat it can done in the 21 day cycle.
It’s a culmination of everything, which is why it’s not really possible to do yourself.
When I say my pile was 160 I do not mean for a few hours on a hot day as you said. It was over 140 for a period of 3 weeks and peaked at 160 for about 5 days. Bones came out of that intact.
Heat + bacteria will not make bones disappear in 21 days or 210 days.