Researchers analysed two methods of extracting brominated flame retardants (BFR) from WEEE, which can give off harmful emissions during reprocessing.
” This project is a pre-emptive move to create a workable, commercially viable solution for industry before the problem becomes acute. “
– Paul Davidson, WRAP
Of the two processes – Creasolv and Centrevap – Creasolv was more effective at removing BFR from WEEE polymers, researchers found, but Centrevap was still found to be suitable for removing other insoluble impurities.
Creaslov works by using a solvent with a high boiling point to dissolve plastic and extract the flame retardants, which are then recovered by crystallization. This reduces the BFR content of the plastic to less than 0.1%.
“Environmentally-friendly”
The report concluded that both methods were viable means of recycling WEEE polymers and were better options than other disposal methods including landfill and incineration. Also, both processes consume less than 20% of the primary energy used in virgin polymer production processes.
The project was carried out by Axion Recycling Ltd and commissioned by WRAP, the Waste and Resources Action Programme. WRAP said it acted on realising that one of the barriers to closed loop recycling of polymers (as encouraged under the WEEE directive) was how to remove these unwanted additives.
WRAP's plastics technology manager Paul Davidson said: “There is an increasing need to respond to the issue of removing BFRs. This project is a pre-emptive move to create a workable, commercially viable solution for industry before the problem becomes acute.
He added: “In order to find a total process solution, every element including the treatment process and the impact of transporting of materials has been taken into account. Combining the best features of the Centrevap and Creasolv processes has potential to produce a process which can remove not only the majority of BFRs but also the majority of other fine particulate contaminates.”
| Related links: |
WRAP says further development of the products is needed but they could be on the market in the next two to four years.
Register for free to comment