RT journal article
T1 Inactivation of simulated aquaculture stream bacteria at low temperature using advanced UVA- and solar-based oxidation methods
A1 Villar Navarro, Elena
A1 Levchuk, Irina
A1 Rueda-Márquez, Juan José
A1 Homola, Tomas
A1 Moriñigo, Miguel Ángel
A1 Vahala, Riku
A1 Manzano Quiñones, Manuel Alejandro
A2 Tecnologías del Medio Ambiente
K1 Aquaculture streams
K1 UVA-based AOPs
K1 Solar AOPs
K1 Low temperature
AB In this work the effect of water temperature (6 +/- 1 degrees C and 22 +/- 1 degrees C) on inactivation of bacteria (104 -106 CFU mL-1; Pseudomonas spp., Aeromonas spp. and Enterobacter spp.) in simulated aquaculture streams (SAS) using UVA based advanced oxidation processes (AOP) (H2O2-assisted UVA; photocatalysis; H2O2-assisted photocatalysis) and solar driven AOPs (H2O2-assisted solar disinfection, SODIS) was studied. Efficiency at 22 degrees C in terms of inactivation rate was higher using H2O2-assisted photocatalysis (H2O2/UVA-TiO2/polysiloxane) > H2O2-assisted UVA disinfection (UVA/H2O2 - 10 mg L-1) > photocatalysis (UVA-TiO2/polysiloxane) > UVA disinfection. At low temperature (6 degrees C) the inactivation rate increased with SODIS/H2O2 > SODIS > H2O2assisted UVA disinfection (UVA/H2O2 - 10 mg L-1) > H2O2-assisted photocatalysis (H2O2/UVA-TiO2/polysiloxane) > photocatalysis (UVA-TiO2/polysiloxane). The main results indicate that the inactivation rates increased when hydrogen peroxide (10 mg L-1) was used during H2O2-assisted UVA disinfection and photocatalysis. In addition, exposure of SAS to hydrogen peroxide for 24 h (in absence of light) at room temperature decreased the subsequent exposure UVA irradiation dose by almost four times. Drastic increase of inactivation rate was observed at low water temperature (6 +/- 1 degrees C) when UVA- and solarbased AOPs were employed compared to 22 +/- 1 degrees C. The treatment with SODIS proved to be more effective in Finland than in Spain. The effect of the low temperature (6 +/- 1 degrees C) was proposed as a critical factor during UVA disinfection (UVA/H2O2 and photocatalysis) that can increase the disinfection rate constant (kmax) by 1.3-5.2 times, leading to a reduction of the treatment costs ( euro m-3) by 1.3-3.3 times. The mechanism of observed enhanced disinfection at low water temperature (6 +/- 1 degrees C) when natural solar light and UVA are employed as irradiation sources for UVA/H2O2 and photocatalytic bacteria inactivation was proposed. No regrowth was observed in case of H2O2-assisted AOPs.
PB ELSEVIER
SN 0038-092X
YR 2021
FD 2021-10
LK http://hdl.handle.net/10498/25745
UL http://hdl.handle.net/10498/25745
LA eng
NO This work was supported by a national research project (SUNRAS PROJECT, Project AGL2016-80507-R) funded by Ministerio de Economia y Competitividad (Plan Nacional de I + D + i (2013-2016). The research was also supported by a PIF contract (UCA/REC01VI/2017) funded by Vicerrectorado de Investigacion of Universidad de Cadiz. D. Sc. Juan Jose Rueda-Marquez is grateful for financial support from Academy of Finland within the project '' Combination of Advanced Oxidation Processes and Photobiotreatment for Sustainable Resource Recovery and Wastewater Reuse'' (application number 322339). T. Homola acknowledges financial support by Czech Science Foundation project 19-14770Y and project LM2018097 funded by the Ministry of Education, Youth and Sports of the Czech Republic.Document
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026