Abstract: A process and apparatus are provided for deodorizing malodorous solids, liquids, and/or gases by contacting them with a mist of an aqueous deodorizing solution consisting of an alkali metal or alkaline earth metal chlorite, buffering agent(s), water, and optionally an alkali metal or alkaline earth metal chlorate and/or an alkali metal alkaline earth metal chloride. The preferred alkali metal is sodium. The deodorizing solution contains available chlorine dioxide and has a pH of about 8.5-9.5. In the process a concentrated solution of the deodorizing solution is diluted and mixed with water and misted into or onto the substance(s) to be deodorized, for example, the sewer gases from a sewage lift station. The apparatus consists of a rotameter which measures the amount of the concentrated deodorizing solution introduced into an eductor for dilution in a passing water stream which is then transported to spray nozzles for misting the malodorous substance(s).