Bio-matter resequencer
From Memory Alpha, the free Star Trek reference.
A bio-matter resequencer was a device which recycled waste products aboard 22nd century starships such as the Enterprise NX. In this process, waste matter is sterilized and broken down for reuse in manufacturing boots, storage containers, and other neccessities.
In 2151, Enterprise captain Jonathan Archer delegated to chief engineer Charles Tucker a child's question, "When you flush the toilet, where does it go?" Displeased with the question which was selected for him, Commander Tucker protested. He ultimately relented and explained the ship's processes of recycling and bio-matter resequencing. (ENT: "Breaking the Ice")
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