TY - JOUR
T1 - Heterogeneous photocatalysis using UVA-LEDs for the removal of antibiotics and antibiotic resistant bacteria from urban wastewater treatment plant effluents
AU - Biancullo, Francesco
AU - Moreira, Nuno F. F.
AU - Ribeiro, Ana R.
AU - Manaia, Célia M.
AU - Faria, Joaquim L.
AU - Nunes, Olga C.
AU - Castro-Silva, Sérgio M.
AU - Silva, Adrián M. T.
N1 - Funding Information:
This work is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675530. The content of this publication reflects only the authors’ views and the Research Executive Agency is not responsible for any use that may be made of the information it contains. This work was also supported by Projects NORTE-01-0247-FEDER-033330 (DEPCAT) funded by ERDF / FEDER (European Regional Development Fund) through NORTE 2020 (Norte Portugal Regional Operational Programme), Associate Laboratory LSRE-LCM – UID/EQU/50020/2019, and LEPABE – UID/EQU/00511/2019, funded by national funds through FCT / MCTES (PIDDAC). NFFM acknowledges FCT (PD/BD/114318/2016). Appendix A
Funding Information:
This work is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 675530. The content of this publication reflects only the authors’ views and the Research Executive Agency is not responsible for any use that may be made of the information it contains. This work was also supported by Projects NORTE-01-0247-FEDER-033330 (DEPCAT) funded by ERDF/FEDER (European Regional Development Fund) through NORTE 2020 (Norte Portugal Regional Operational Programme), Associate Laboratory LSRE-LCM – UID/EQU/50020/2019, and LEPABE – UID/EQU/00511/2019, funded by national funds through FCT/MCTES (PIDDAC). NFFM acknowledges FCT (PD/BD/114318/2016).
Publisher Copyright:
© 2019 The Authors
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Secondary urban wastewater samples were spiked with azithromycin (AZT), trimethoprim (TMP), ofloxacin (OFL) and sulfamethoxazole (SMX) at 100 µg L−1 to investigate the efficiency of a TiO2-photocatalytic treatment using UVA-LEDs. Different operating parameters were studied, such as the irradiation conditions, catalyst load and the use of methanol as carrier solvent and radical scavenger. The most efficient conditions to treat spiked urban wastewater (4 LEDs symmetrically distributed and 1.00 g L−1 of catalyst) were also assessed on the removal of the antibiotics at real concentrations, as well as on the inactivation and regrowth of bacteria after 3-day storage (total and resistant heterotrophs, Escherichia coli and enterococci). Clindamycin (CLI) was targeted when SMX was not detected. One-hour treatment was enough to reduce the analysed antibiotics to values below the detection limits and to decrease the bacterial load by 2 log-units. Bacterial regrowth was observed for total heterotrophs, after the storage of photocatalytic treated wastewater, to values close to pre-treatment. However, the antibiotic resistance percentage of such stored wastewater was always similar or lower than that of secondary urban wastewater. Thus, the potential of this process as part of the tertiary treatment is demonstrated, but conditions must be adjusted to minimize microbial regrowth.
AB - Secondary urban wastewater samples were spiked with azithromycin (AZT), trimethoprim (TMP), ofloxacin (OFL) and sulfamethoxazole (SMX) at 100 µg L−1 to investigate the efficiency of a TiO2-photocatalytic treatment using UVA-LEDs. Different operating parameters were studied, such as the irradiation conditions, catalyst load and the use of methanol as carrier solvent and radical scavenger. The most efficient conditions to treat spiked urban wastewater (4 LEDs symmetrically distributed and 1.00 g L−1 of catalyst) were also assessed on the removal of the antibiotics at real concentrations, as well as on the inactivation and regrowth of bacteria after 3-day storage (total and resistant heterotrophs, Escherichia coli and enterococci). Clindamycin (CLI) was targeted when SMX was not detected. One-hour treatment was enough to reduce the analysed antibiotics to values below the detection limits and to decrease the bacterial load by 2 log-units. Bacterial regrowth was observed for total heterotrophs, after the storage of photocatalytic treated wastewater, to values close to pre-treatment. However, the antibiotic resistance percentage of such stored wastewater was always similar or lower than that of secondary urban wastewater. Thus, the potential of this process as part of the tertiary treatment is demonstrated, but conditions must be adjusted to minimize microbial regrowth.
KW - Antibiotic resistant bacteria
KW - Bacterial regrowth
KW - Disinfection
KW - Light emitting diodes (LEDs)
KW - Micropollutant
KW - TiO-P25
UR - http://www.scopus.com/inward/record.url?scp=85062097967&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.02.012
DO - 10.1016/j.cej.2019.02.012
M3 - Article
AN - SCOPUS:85062097967
SN - 1385-8947
VL - 367
SP - 304
EP - 313
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -
