Final answer:
Empty or near-empty cylinders should be returned to the supplier or disposed of in a designated area based on specific regulations. They must be stored securely before disposal and repurposing should only be done by professionals.
Step-by-step explanation:
When disposing of empty or near-empty cylinders, the preferred method is to return them to the supplier. This ensures that they can handle the cylinders properly, given the potential hazards associated with compressed gases and the materials they previously contained. If returning them is not possible, you should dispose of them in a designated area following your institution's guidelines or local regulations. It is essential not to dispose of them in regular trash due to the risks they pose. Depending on the previous contents, some cylinders can be repurposed, but only after they have been properly cleaned and decommissioned, which is a process that typically requires professional handling.
In line with safety protocols, it's critical to store them in a secure location while awaiting disposal to prevent accidents. Using them for other purposes may seem economical, but this should be done only if the cylinders are suitable for alternative use and have been safely repurposed by professionals. It is vital to remember that, in case of accidents or chemical spills, you should call your teacher at once. Additionally, always check with your teacher on how to dispose of waste, as chemicals should not be disposed of improperly, such as down the sink.