If production line is for production, what is the name of the line for decomposition?

My first option would be disassembly line.

The second choice would be recovery line.

A more mouthful would be Disassembly & Recovery for Recycling

A production line works because it is a line producing a product.

There is no equivalent decomposition line.

The equivalent would be a recycling system because it depends on breaking down individual products into components and reusing the components in new products.

Products are different and require similarities to allow cost-efficient recycling. Recycling a Ford F150 is not the same as a Tesla. They are similarities, but fundamental differences. But there is no single or planned end-of-life for all one type of product, so you cannot have a decomposition line.

The simpler and the more common a product, the easier to recycle. Drink cans. But cars are broken down in scrap yards and components compressed and send to factories for reuse. If there is no value that someone can recover, components are scrapped, with no reuse.

Dissassembly is only the first step in a process that requires the recycled components to be reused.