The turbine blades are made of fiber glass or carbon fiber. There is no process in effect to deal with them. Too big to crush, not worth scraping or recycling. They all go landfilla.
There currently are processes to deal with them, multiple companies are working on the problem.
Current solutions include shredding them and reconstituting into some sort of alternative building material, chemically separating the parts of the composite and creating recycled resin, and mechanically separating and sorting apart the different materials which are then recombined for alternative use.
This is a good place to look at recent american efforts, but there is more recent information available elsewhere: https://www.energy.gov/eere/wind/wind-turbine-materials-recycling-prize
