Nitrification Posted on 9th December 201515th May 2021 by ThePD (The Project Definition) Nitrification is a biological oxidation of ammonium salts to nitrites and the further oxidation of nitrites to nitrates. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Engineering and tagged plant, process, technology. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.