[freebeard]

www.bloomberg.com/news/: Wind Turbine Blades Can’t Be Recycled, So They’re Piling Up in Landfills
Companies are searching for ways to deal with the tens of thousands of blades that have reached the end of their lives.

“Wind turbine blades at the end of their operational life are landfill-safe, unlike the waste from some other energy sources, and represent a small fraction of overall U.S. municipal solid waste,” according to an emailed statement from the group. It pointed to an Electric Power Research Institute study that estimates all blade waste through 2050 would equal roughly .015% of all the municipal solid waste going to landfills in 2015 alone.

Let's compare it to something entirely else that's bigger.

It sounds to me like a job for basalt fiber:

Originally Posted by DDG

Recyclable Resource - Basalt Fiber Tech Proprieties
basaltft.com
Recyclable Resource . Basfiber ® is an eco-compatibility material, characterized from an easier recyclability if compared for example, to glass fiber. In fact the principal problem in glass fibers recycling is that they melt during incineration, sticking to the inside of the incinerator chamber.