I’m copying below a section of an email response I received from Abbot when I inquired of them. I hope you might find it useful.
All the components of the FreeStyle Libre should be disposed of in accordance with all applicable local regulations related to the disposal of electronic equipment, batteries, sharps, and materials potentially exposed to body fluids. The sensor applicator is a sharp. The FreeStyle Libre sensor and applicator have to be disposed of in the sharp container. The sensor pack and applicator cap could be disposed of under normal municipal recycling.