Physical separation before procedural separation
A written rule that clinical waste goes in one corner and food waste in another will hold for a while and then stop. Physical separation works better: designated bays, marked floor areas, different bin types and where possible a locked section for regulated waste. The room's layout should make the correct action the easy one rather than relying on people remembering under time pressure.
Where the room cannot be reconfigured, signage and consistent bin positioning do some of the work. The cleaning arrangement contributes by returning bins to their marked positions after collection, which sounds trivial and is one of the more effective controls available. A bin left in the wrong bay for a week trains everyone into the wrong habit. Returning them is a task worth naming in the scope rather than assuming.
