My town (named after a window system protocol back in 1835) has implemented activated carbon filtration to remove PFAS from municipal well water. After the carbon filter medium has been saturated it will need to be safely disposed of, including its PFAS load.

Being able to dispose of those filters in-situ by ball milling might make sense if the cost of the machine is less than the ongoing disposal costs for the filters. edit: EPA rulemaking for disposal of spent carbon filters is in process.