Essay Example on In the event that there is a TN limit

 It has been suggested that the impact of pH on ammonium oxidation in partial nitritation reactors is driven by three procedures activation and deactivation of nitrifying enzymes changes in inorganic carbon concentrations and changes in FA and free nitrogen ammonium FNA concentrations At higher pH carbonate and bicarbonate are available at higher concentrations and in this way the buffer limit of the system increases Alejandro et al 2014 On the other hand as the pH drops below 7 7 the equilibrium tends to carbon dioxide prompting loss of buffer limit High pH has been associated to the formation of FA which is the essential substrate for AOB and has additionally been associated with a reduction in FNA concentration which is the essential substrate of NOB communities Then again it has been exhibited that nitrification does not happen at a pH below 6 Thus control of the pH in partial nitritation systems can choose for AOB and restrain NOB because of the formation of FA and the restriction of FNA Alejandro et al 2014