Waste Derived Fuel
A fuel that has been produced from the processing of waste into a specification for an end user. The export of WDF from the UK (primarily to the EU) requires the fuel to be sufficiently treated and processed to meet a specification of the user, which must be classified as an R1 facility. WDF is generally characterised into RDF and SRF but for the purposes of legislation remains a waste (unless stringent End of Waste Criteria can be met) and so users have to comply with the WID.