Campos Gómez, José LuisDumais, JacquesPavissich, Juan PabloFranchi, ÓscarCrutchik, DafneBelmonte, MarisolFaúndez, MartínJorquera, LorenaPedrouso Fuentes, AlbaMosquera Corral, AnuskaVal del Río, Ángeles2020-05-062020-05-062019Campos, J. L., Dumais, J., Pavissich, J. P., Franchi, O., Crutchik, D., Belmonte, M., Faúndez, M., Jorquera, L., Pedrouso, A., Mosquera-Corral, A., & Val Del Río, Á. (2019). Predicting Accumulation of Intermediate Compounds in Nitrification and Autotrophic Denitrification Processes: A Chemical Approach. BioMed research international, 7 Jul., 2051986. doi: 10.1155/2019/20519862314-6133http://hdl.handle.net/10347/22065Nitrification and sulfur-based autotrophic denitrification processes can be used to remove ammonia from wastewater in an economical way. However, under certain operational conditions, these processes accumulate intermediate compounds, such as elemental sulphur, nitrite, and nitrous oxide, that are noxious for the environment. In order to predict the generation of these compounds, an analysis based on the Gibbs free energy of the possible reactions and on the oxidative capacity of the bulk liquid was done on case study systems. Results indicate that the Gibbs free energy is not a useful parameter to predict the generation of intermediate products in nitrification and autotrophic denitrification processes. Nevertheless, we show that the specific productions of nitrous oxide during nitrification, and of elemental sulphur and nitrite during autotrophic denitrification, are well related to the oxidative capacity of the bulk liquid.eng© 2019 José Luis Campos et al. Open Access.This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly citedhttps://creativecommons.org/licenses/by/4.0/NitrificationAutotrophic processesWaste waterAmmoniaOxidation-ReductionNitrous oxidejournal article10.1155/2019/20519862314-6141open access