Suggestions that a collection scheme report revealed glass from commingled schemes was good enough quality for remelt have been criticised by British Glass.
Greenstar chief executive Ian Wakelin said he was delighted that the study by the Waste & Resources Action Programme (WRAP) showed that materials recycling facilities were capable of producing high quality glass and paper (MRW June 6).
However, British Glass director general David Workman said: I am concerned that Greenstar has taken the findings from the glass study as being conclusive where in fact they are indicative. WRAP materials recycling manager Steve Waite said in his report presentation that WRAP is intending to conduct a second study, inferring that further work was required.
The study investigated whether it was feasible to remove glass from a MRF to a standard suitable for remelt into new bottles and jars.
Workman said the results showed that some glass could be removed for remelt but added: The quantities used in the trials were small and the plant processing the cullet was running at well below capacity.
He also said that the study had not investigated the economics of processing cullet from an MRF to a remelt standard.
The price differential between cullet and virgin raw materials is not significant and therefore any additional processing will reduce margins and possibly make MRF glass uneconomic for use in remelt, Workman said.
He said that the greenest option for glass recycling is a closed loop option (MRW June 20).