RT Journal Article
T1 Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration
A1 Díaz, Claudia
A1 Belmonte, Marisol
A1 Campos Gómez, José Luis
A1 Franchi, Óscar
A1 Faúndez, Martín
A1 Vidal, Gladys
A1 Argiz Montes, Lucía
A1 Pedrouso Fuentes, Alba
A1 Val del Río, Ángeles
A1 Mosquera Corral, Anuska
K1 Anammox
K1 Dissolved oxygen
K1 Granular biomass
K1 Nitrogen
K1 SRT
K1 Temperature
AB When partial nitritation-anammox (PN-AMX) processes are applied to treat the mainstream in wastewater treatment plants (WWTPs), it is difficult to fulfil the total nitrogen (TN) quality requirements established by the European Union (<10 g TN/m3). The operation of the anammox process was evaluated here in a continuous stirred tank reactor operated at 15 °C and fed with concentrations of 50 g TN/m3 (1.30 ± 0.23 g NO2−-N/g NH4+-N). Two different aspects were identified as crucial, limiting nitrogen removal efficiency. On the one hand, the oxygen transferred from the air in contact with the mixed liquor surface favoured the nitrite oxidation to nitrate (up to 75 %) and this nitrate, in addition to the amount produced from the anammox reaction itself, worsened the effluent quality. On the other hand, the mass transfer of ammonium and nitrite to be converted inside the anammox granules involves relatively large values of apparent affinity constants (kNH4+app: 0.50 g NH4+-N/m3; kNO2-app: 0.17 g NO2−-N/m3) that favour the presence of these nitrogen compounds in the produced effluent. The careful isolation of the reactor from air seeping and the fixation of right hydraulic and solids retention times are expected to help the maintenance of stability and effluent quality
PB Institution of Chemical Engineers
PB Elsevier
YR 2020
FD 2020
LK http://hdl.handle.net/10347/27887
UL http://hdl.handle.net/10347/27887
LA eng
NO Díaz, C., Belmonte, M., Campos, J. L., Franchi, O., Faúndez, M., Vidal, G., . . . Mosquera-Corral, A. (2020). Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration. Process Safety and Environmental Protection, 138, 349-355. doi:10.1016/j.psep.2020.03.025
NO This work was funded by the Chilean Government through the projects FONDECYT 1150285 and ANID/FONDAP/15130015. Anuska Mosquera-Corral wants to thank the MEC-CONICYT project 80180081 for its financial support in the short stay in the UAI, UdeC and UPLA (Chile) to collaborate in the elaboration of this paper. The authors from the USC belong to CRETUS Strategic Partnership (ED431E 2018/01) and to the Galician Competitive Research Group (GRC-ED431C 2017/29). All these programs are co-funded by FEDER (EU) funds. The authors want to thank AQUALIA (Spain) and Aguas Andinas (Chile) for providing both anammox biomass and treated wastewater, respectively. Marisol Belmonte belong to: LABMAI-Facultad de Ingeniería, HUB-Ambiental UPLA and UPLAguas Research Group
DS Minerva
RD 23 abr 2026