The present disclosure relates to methods and system for disinfecting surfaces within a volumetric space by forming peracids in a reaction layer in situ directly on the surfaces to be disinfected. Particularly, a peroxide compound and an organic acid compound are sequentially dispersed into the volumetric space, preventing peracids from being formed until the two reactants contact each other on the surface to be disinfected. Peracid reactant compounds may be dispersed as electrostatically charged droplets or as a vapor. In particular, a system for sequentially dispersing the peracid reactant compounds by electrostatic spraying is provided.
