Nov 8, 7:01 AM
Chinese Researchers Develop High-Heat Method to Recycle Wind Turbine Blades
Europe faces 55,000 tonnes of annual blade waste by 2030 as industry calls for legislative landfill bans.
Researchers at Tsinghua University in China have developed a processing technique that converts retired wind turbine blades into industrial materials, offering a potential technical solution to accumulating renewable energy waste. The study, published in the scientific journal Chem Circularity, demonstrates how a process known as flash joule heating transforms composite blade components into silicon carbide and graphene.
The technology comes as European countries face an expanding volume of decommissioned wind turbines reaching the end of their operational lifespan. According to projections by the industry association WindEurope, annual blade waste across the continent will grow from 20,000 tonnes in 2025 to 55,000 tonnes by 2030. While up to 90 percent of a turbine's total weight can be processed through existing recycling channels, the blades themselves present structural obstacles.
Engineered to endure ultraviolet radiation, lightning strikes, and extreme wind forces, turbine blades consist of carbon-rich polymer resins combined with silica fiberglass. Due to these durable material bonds, retired blades after roughly 20 years of service are frequently deposited in landfill sites or burned in incinerators.
To curb disposal, WindEurope enacted a voluntary industry-wide landfill ban last year and urged European Union policymakers to convert the voluntary measure into legally binding EU law. Industry representatives argue that statutory rules are necessary to spur investment into sustainable recycling technologies across member states.
The new processing technique exposes shredded blade materials to temperatures of approximately 2,000 degrees Celsius for several seconds. At these high temperatures, the carbon and silica reorganize into silicon carbide, a hard ceramic compound, and conductive graphene. According to study senior author Bing Deng, a chemical and environmental engineer at Tsinghua University, the resulting output can be reused directly in manufacturing.
The study team reported that adding 0.3 percent by weight of this output into fresh resin increased its resistance to deformation under tension by 27 percent and by 9 percent under bending stress. These material properties allow the recovered output to be incorporated directly back into new rotor blade production.
Written by Christiane Hofreiter christiane.hofreiter@alpineweekly.com
