The déchetterie is where you take stuff to be recycled or disposed of, that is for whatever reason, not suitable for the smaller local bins provided. For example, you take used engine oil there, half-empty paint tins and garden waste. We have been going there a fair bit recently with garden waste. Normally I shred and compost all the waste from my garden, but recently we have been cleaning an area that contains a lot of wild clematis.
Clematis is vile stuff; toxic and with a sap that, if you shred the plant, ends up in a fine spray and does nasty things to your eyes and lungs. So we take it to the dump from where it is shredded along with other garden waste in industrial quantities by huge machines, then composted and distributed (sold?) to local farmers.
Our déchetterie has had a revamp recently. It's much bigger than it used to be, with a big tarmac on-ramp, plenty of large containers for the rubbish, each one for dumping a different type of material. There is a container for card, one for plastic, one for metals, and so on. Much of it gets recycled.
Generally I'm in favour of recyling efforts, although I do wonder how efficient they are. Does the Earth-saving value obtained from recycling my bins of plastic, glass and metal compensate for the use of diesel to drive there? How about if you take into account the energy needed to build the place? Would the planet be better off if I just let the clematis dry out then burn it? I have no real idea.