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Windmills - scrapped

10.07.2010

On the territory of Germany, from the Alps to the North Sea, more than 20 thousand wind power generators are now operating. This is a relatively new technique, but from 2020 it will begin to deplete its resource and there will be a problem of recycling old windmills. Reinforced concrete supports, generators and various metal parts are easy to reuse, but what about rotor blades made of fiberglass?

After 2020, 15 thousand blades will have to be replaced annually. They consist of a hardened polymer resin stuffed with fiberglass for strength. Burying in landfills is prohibited by law, burning - toxic gases are obtained, which are too expensive to capture with special filters.

In addition, melting glass clogs the grates of incinerators. It is possible to melt down crushed fiberglass into other products, such as garden benches, but Germany doesn't need that many benches.

A way out of the situation is proposed by the Swiss company "Holzim", a cement manufacturer. It turned out that crushed fiberglass can replace part of the fuel in clinker kilns. Temperatures up to 2000 degrees develop in the oven and all poisons burn out. In addition, melting fiberglass replaces part of the sand in the cement mixture - after all, this is the same silicon dioxide.

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