A comparative study on the chronic responses of titanium dioxide nanoparticles on aerobic granular sludge and algal-bacterial granular sludge processes.

Autor: Kedves A; Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary. kedvesalfonz@chem.u-szeged.hu., Haspel H; Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary.; HUN-REN Reaction Kinetics and Surface Chemistry Research Group, Szeged, Hungary., Yavuz Ç; Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary., Kutus B; Department of Molecular and Analytical Chemistry, University of Szeged, Szeged, Hungary., Kónya Z; Department of Applied and Environmental Chemistry, University of Szeged, Szeged, Hungary.; HUN-REN Reaction Kinetics and Surface Chemistry Research Group, Szeged, Hungary.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Nov 20. Date of Electronic Publication: 2024 Nov 20.
DOI: 10.1007/s11356-024-35581-z
Abstrakt: The chronic effects of titanium dioxide nanoparticles (TiO 2 NPs) on aerobic granular sludge (AGS) and algal-bacterial granular sludge (ABGS) was examined in this study. Sequencing batch bioreactors (SBRs) and photo sequencing batch bioreactors (PSBRs) were operated with synthetic wastewater containing 0, 1, 5, 10, 20, 30, and 50 mg L -1 TiO 2 NPs for 10 days. Nanoparticles at concentrations of 1 and 5 mg L -1 did not impact nutrient removal but led to an increase in extracellular polymeric substances (EPSs), primarily in protein (PN). With increasing nanoparticle concentration, the negative effect became more pronounced, mainly in the AGS SBRs. At 50 mg L -1 TiO 2 , chemical oxygen demand (COD), ammonia-nitrogen (NH 3 -N), and phosphorus (PO 4 3- ) removal decreased by 20.9%, 12.2%, and 35.1% in AGS, respectively, while in ABGS, they reached only 13.4%, 5.7%, and 14.2%. ABGS exhibited steady-state nutrient removal at 30 and 50 mg L -1 TiO 2 NPs after around 5 days. The higher microbial activity and EPS content in the sludge, coupled with the symbiotic relationship between algae and bacteria, contributed to the higher tolerance of ABGS to nanoparticles. Finally, although nanoparticles reduced biomass in both types of bioreactors, the accumulation of TiO 2 NPs in the sludge, confirmed by Energy-dispersive X-ray spectroscopy analysis, and the absence of detectable titanium concentrations in the effluent wastewater, measured by Inductively-coupled plasma mass spectrometry, may be attributed to the specific operational conditions of this study, including the relatively short operation period (10 days) and high initial MLSS concentration (6 g L -1 ).
Competing Interests: Declarations Ethical approval Not applicable. Consent to participate Not applicable. Consent to publish All the authors have approved the manuscript for publication. Competing interests The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024. The Author(s).)
Databáze: MEDLINE
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