Hi it is "déchets solides urbains"MSW isn't a place, tilt... but it is a "technical" term.
I believe the equivalent for MSW is déchets solides urbains, but I would be more comfortable if a native speaker or an engineer could confirm that.
Municipal in French, refers only to things relative the local government. Urbain refers to anything relative to towns, by oppostion to rural.municipal means of or pertaining to a town or city or to its corporate or local government. Therefore, urban. It's not that strange really!