The system consists of a Raspberry Pi 2W that is not easily recyclable
The enclosure of the system will be made of some sort of plastic
The sensors will be made of small metal wires, possibly insulated with plastic
Several companies provide simple means to send in Raspberry Pi boards so they can be repurposed
The material chosen for the enclosure can be biodegradable such that it can be put it a landfill
The sensors can easily be taken apart and have their parts be either repurposed or recycled