RT Journal Article
T1 Performance of a two-stage partial nitritation-anammox system treating the supernatant of a sludge anaerobic digester pretreated by a thermal hydrolysis process
A1 Valenzuela-Heredia, Daniel
A1 Panatt, Camila
A1 Belmonte, Marisol
A1 Franchi, Óscar
A1 Crutchik, Dafne
A1 Dumais, Jacques
A1 Vázquez Padín, José Ramón
A1 Lesty, Yves
A1 Pedrouso Fuentes, Alba
A1 Val del Río, Ángeles
A1 Mosquera Corral, Anuska
A1 Campos Gómez, José Luis
K1 Ammonium oxidizing bacteria
K1 Autotrophic nitrogen removal
K1 Inhibition
K1 NOB suppression
K1 Operational stability
K1 THP
AB A two-stage system (partial nitritation (PN) and anammox processes) was used to remove nitrogen from the dewatering liquor originating from the thermal hydrolysis/anaerobic digestion (THP/AD) of municipal WWTP sludge. Two strategies were tested to start up the PN reactor: 1) maintaining a fixed hydraulic retention time (HRT) and increasing the ammonium loading rate (ALR) by decreasing the feeding dilution ratio and 2) feeding undiluted dewatering liquor and gradually decreasing the HRT. With diluted feeding, the reactor performance had destabilization episodes that were statistically correlated with the application of high specific ammonium (> 0.6 g NH4+-N/(g TSS·d)) and organic (> 0.7 g COD/(g TSS·d)) loading rates. The second strategy allowed stable PN reactor operation while treating ALR up to 4.8 g NH4+-N/(L·d) and demonstrating that dilution of THP/AD effluents is not required. The operating conditions promoted the presence of free nitrous acid levels (> 0.14 mg HNO2-N/L) inside the PN reactor that inhibited the proliferation of nitrite oxidizing bacteria. Batch activity tests showed that the inhibitory effects of organic compounds present in the THP/AD dewatering liquor on the ammonia oxidizing bacteria activity can be removed in the PN reactor. Thus, aerobic pretreatment would not be necessary when two-stage systems are used. The PN reactor effluent was successfully treated by an anammox reactor. An economic analysis showed that using two-stage systems is advantageous for treating THP/AD dewatering liquor. The implementation of an aerobic pre-treatment unit is recommended for WWTPs capacities higher than 5·105 inhabitants equivalent when one-stage systems are used
PB Elsevier
YR 2021
FD 2021
LK http://hdl.handle.net/10347/27907
UL http://hdl.handle.net/10347/27907
LA eng
NO Valenzuela-Heredia, D., Panatt, C., Belmonte, M., Franchi, O., Crutchik, D., Dumais, J., . . . Campos, J. L. (2022). Performance of a two-stage partial nitritation-anammox system treating the supernatant of a sludge anaerobic digester pretreated by a thermal hydrolysis process. Chemical Engineering Journal (Lausanne, Switzerland : 1996), 429, 131-301. doi:10.1016/j.cej.2021.131301
NO This research was funded by the Chilean Government through the Projects ANID/FONDECYT/1200850 and CRHIAM Centre grant number ANID/FONDAP/15130015, by the Spanish Government through TREASURE [CTQ2017-83225-C2-1-R] and by the European Commission LIFE ZERO WASTE WATER [LIFE19ENV/ES/000631] projects. The authors from Universidade de Santiago de Compostela belong to CRETUS Strategic Partnership [ED431E 2018/01] and the Galician Competitive Research Group [GRC ED431C 2017/29]. All the Spanish programs are co-funded by FEDER (EU)
DS Minerva
RD 27 abr 2026