Municipal compost is put through a tub grinder, which masticates everything to a fine degree. So even there, it’s not really the heat. They are just grinding it to the point where you can’t distinguish it from other bits of rock and silica in the soil.
Video: https://youtu.be/j_RXRqFB_bM?si=g2_1Pt99qIc9cq6g
Also, I’ve gotten my home compost over 160 degrees F which is considerably hotter. I mean the same pile that these bones have survived.
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.