They will want to know that their efforts are successful and appreciated. Enforcement Recycling is now required by law. Most employees will recycle out of a sense of responsibility and a concern for the environment. Some may not. Talk to your employees.
Communication is the best means of increasing participation.
Some employees may help identify ways to increase participation and quality control. Peer pressure is a valuable tool in ensuring participation. Put a recycling section in your training manual for new employees explaining the Recycling Law and how your recycling program works. Work with the employees who are enthusiastic about recycling. Establish team leaders who will take on the responsibility of reminding other workers in their department or in their building to recycle.