Disposal is the act of getting rid of something that is no longer wanted or needed.
discarding , dumping
methods for the permanent disposal of radioactive wastes.
放射性废料的永久清除方法。
waste disposal sites.
垃圾弃置场地。
at one's disposal
If you have something at your disposal, you are able to use it whenever you want, and for whatever purpose you want. If you say that you are at someone's disposal, you mean that you are willing to help them in any way you can.
Do you have this information at your disposal?
你能随意使用这一资料吗?