A mains electricity (AC-powered) mobile device designed for the automated dispersion of an appropriate disinfectant [e.g., formaldehyde, hydrogen peroxide (H2O2)] into the atmosphere of an enclosed area [e.g., operating room (OR), examination/treatment room] to destroy harmful microorganisms or inhibit their activity on the surfaces of medical devices and equipment after they have been exposed to microbial contamination (bacteria, fungi, viruses, spores of bacteria). It typically consists of a programmable aerosol electrical generator, user controls, tubing and connectors, and a recess for holding a prefilled canister of the disinfectant.