PP exhaust tower principle is mainly based on exhaust gas to be processed components using acid (sulfuric acid), alkali (sodium hydroxide), strong oxidizer (sodium hypochlorite) as a spray washing solution and gas processing waste gas molecules in a gas liquid contact, gets phase of processing waste gas composition is transferred to the liquid phase, and using chemical agents and processing waste gas composition phase and, oxidation or other chemical reaction to remove waste material processing. PP exhaust tower for sludge treatment, food, petroleum, chemical, pharmaceutical and other industries