To meet Defstan 91/91, the fuel must consist solely of hydrocarbons and approved additives. Industrial antifreeze will be glycol based, and is therefore neither an approved additive nor a hydrocarbon. No amount of blending could restore it to spec.
Generally, contaminated kero can be used as a viscosity cutter for fuel oil or a cold property improver gas oil blend stock. Severely contaminated kero can in some instances be re-refined. However, the remote location and relatively small quantity involved means it would be uneconomic to ship out, so I suspect it will end up being used locally as a heating oil.
M9
