RT Journal Article
T1 Ozone injection system based on NETmix technology for quaternary treatment of urban wastewater
A1 Pituco, Mateus Mestriner
A1 Marrocos, Paulo H.
A1 Méndez, Sandra
A1 Montes Goyanes, Rosa
A1 Rodil Rodríguez, María del Rosario
A1 Moreira, Francisca C.
A1 Vilar, Vítor J. P.
K1 Ozonation
K1 Contaminants of emerging concern
K1 Static mixer
K1 Gas-liquid mass transfer
K1 Ozone absorption rate
AB An innovative high-intensity static mixer technology, known as NETmix, was applied as an ozone (O3) gas injection system to promote the quaternary treatment of urban wastewater (UWW), focusing on the elimination of contaminants of emerging concern (CECs). The NETmix network with an exclusive geometry boosts mass transfer rates and rapidly develops an O3-rich stream to react with CECs. The mixer operated in continuous mode promotes a rapid gas (O3)–liquid (water) dissolution. The ozonation process’ performance was evaluated for the abatement of 19 CECs spiked (10 μg dm−3 each) in demineralized water and two tertiary-treated UWW matrices, coming from (i) a secondary settler tank after a conventional activated sludge and (ii) the outlet of a membrane biological reactor (MBR). In addition, the ozonation system was tested for removing a broad range of CECs at natural trace levels from the UWW matrix coming from the MBR. In the realistic wastewater contamination scenario, a maximum transferred O3 dose of 1.28 and 0.76 resulted in removal values ≥80% for 12 out of the 19 spiked CECs from the secondary settler tank, and 9 out of the 19 spiked CECs from the post-MBR treatment, respectively, at a very short hydraulic residence time (55 s). Moreover, removals ≥80% were attained for 22 out of 25 CECs detected in the effluent from the MBR, applying a specific O3 dose of 0.6 . The enhanced ozone-water mass transfer provided by the NETmix technology enabled high removal efficiencies for CECs.
PB Elsevier
YR 2025
FD 2025-04
LK https://hdl.handle.net/10347/42899
UL https://hdl.handle.net/10347/42899
LA eng
NO Journal of Environmental Chemical Engineering Volume 13, Issue 2, April 2025, 115465
NO This work was supported by national funds through FCT/MCTES (PIDDAC): Project PTDC/EAM-AMB/4702/2020 - Cutting-Edge Ozone-Technology for Water, with DOI 10.54499/PTDC/EAM-AMB/4702/2020 (https://doi.org/10.54499/PTDC/EAM-AMB/4702/2020); LSRE-LCM, UIDB/50020/2020 (DOI: 10.54499/UIDB/50020/2020) and UIDP/50020/2020 (DOI: 10.54499/UIDP/50020/2020); and ALiCE, LA/P/0045/2020 (DOI: 10.54499/LA/P/0045/2020). M. M. Pituco and P.H. Marrocos acknowledge FCT for their Ph.D. scholarships (SFRH/BD/144673/2019 – DOI: 10.54499/SFRH/BD/144673/2019; and 2022.10437.BD, respectively). F. C. Moreira and V. J. P. Vilar acknowledge the FCT Individual Call to Scientific Employment Stimulus 2017 (CEECIND/02196/2017 and CEECIND/01317/2017, respectively). M.M. Pituco also gives special thanks to Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Departamento de Ingeniería Química y Química Física – Universidad de Extremadura, under the supervision of Prof. Dr. Eva M. Rodríguez, for the assistance with the procedure to determinate the absolute rate constants of ozone-saccharin reaction.
DS Minerva
RD 20 may 2026