Sorption of selected pharmaceuticals on river benthic biofilms formed on artificial substrata

Dömölki, Borbála; Krakkó, Dániel; Dobosy, Péter; Trábert, Zsuzsa; Illés, Ádám; Stefán, Dávid; Székacs, András; Ács, Éva; Záray, Gyula

doi:10.1016/j.ecolind.2022.108837

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…Furthermore, as DIC is negatively charged at our experimental pH, it could therefore also sorb electrostatically to positively charged fractions of the EPS, such as amino groups in sugars and proteins, as it was suggested by Rodriguez-Escales and Sanchez-Vila to describe the enhanced sorption of the UV filter BP-3 in the presence of biofilm. Additionally, DIC has been extracted from river biofilms as well, − confirming the possibility of retention of DIC onto biofilms. Besides sorption, DIC was also biodegraded in C1 and C2, but not in C3.…”

Section: Resultsmentioning

confidence: 99%

“…Sorption was more pronounced in C3, being consistent with batch experiments, which showed more sorption in the muffled soil ( Section S14 ). The different behavior of MET can be explained by its cationic charge at the pH during the experiments, allowing ionic interaction with soil (negatively charged) and biofilm (negatively charged above a pH of 7 82 ). Enhanced sorption due to biofilm is a plausible explanation for the higher retention of MET in C1 than that in C2.…”

Section: Resultsmentioning

confidence: 99%

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Role of Soil Biofilms in Clogging and Fate of Pharmaceuticals: A Laboratory-Scale Column Experiment

Muñoz-Vega,

Schulz,

Rodriguez-Escales

et al. 2023

Environ. Sci. Technol.

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Contamination of groundwater with pharmaceutical active compounds (PhACs) increased over the last decades. Potential pathways of PhACs to groundwater include techniques such as irrigation, managed aquifer recharge, or bank filtration as well as natural processes such as losing streams of PhACs-loaded source waters. Usually, these systems are characterized by redox-active zones, where microorganisms grow and become immobilized by the formation of biofilms, structures that colonize the pore space and decrease the infiltration capacities, a phenomenon known as bioclogging. The goal of this work is to gain a deeper understanding of the influence of soil biofilms on hydraulic conductivity reduction and the fate of PhACs in the subsurface. For this purpose, we selected three PhACs with different physicochemical properties (carbamazepine, diclofenac, and metoprolol) and performed batch and column experiments using a natural soil, as it is and with the organic matter removed, under different biological conditions. We observed enhanced sorption and biodegradation for all PhACs in the system with higher biological activity. Bioclogging was more prevalent in the absence of organic matter. Our results differ from works using artificial porous media and thus reveal the importance of utilizing natural soils with organic matter in studies designed to assess the role of soil biofilms in bioclogging and the fate of PhACs in soils.

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