Charge as a key physicochemical factor in adsorption of organic micropollutants from wastewater effluent by rice husk bio-silica.

Autor: Rodriguez-Otero A; Analytical Chemistry Group, Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark; Universite de Pau et des Pays de l'Adour, E2S UPPA CNRS IPREM UMR5254, Technopôle Hélioparc, 2 Avenue du Président Angot, Pau 64053, France., Tisler S; Analytical Chemistry Group, Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark., Reinhardt LM; Analytical Chemistry Group, Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark., Jørgensen MB; BIOFOS A/S, Refshalevej 250, Copenhagen 1432, Denmark; MSCi, Bøgesvinget 8, Skovlunde 2740, Denmark., Bouyssiere B; Universite de Pau et des Pays de l'Adour, E2S UPPA CNRS IPREM UMR5254, Technopôle Hélioparc, 2 Avenue du Président Angot, Pau 64053, France. Electronic address: brice.bouyssiere@univ-pau.fr., Christensen JH; Analytical Chemistry Group, Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2024 Nov 04; Vol. 268 (Pt B), pp. 122748. Date of Electronic Publication: 2024 Nov 04.
DOI: 10.1016/j.watres.2024.122748
Abstrakt: Wastewater treatment plants (WWTPs) often fail to fully remove organic micro-pollutants (OMPs), necessitating advanced treatment methods. This study examines the potential of an agricultural waste-derived adsorbent, rice husk (RH) - silica, for removing a complex mixture of 20 OMPs in MilliQ water and wastewater effluent. While RH-silica shows potential for OMP removal, its performance with multicomponent mixtures in real wastewater has yet to be investigated. Batch experiments demonstrated the efficacy of RH-silica in removing cationic, neutral, polar, and non-polar OMPs across various pH levels, with no adsorption of anionic OMPs. Column elution studies revealed that only positively charged compounds did not reach a breakthrough after 300 specific bed volumes (BVs), even when the filtration velocity was increased fivefold (3.8 m/h) and lower adsorbent-to-volume ratios (0.5 g/L) were employed. This indicates that electrostatic interactions via deprotonated silanol groups are the primary adsorption mechanism. RH-silica's ability to retain cationic pollutants regardless of their hydrophilicity degree highlights its potential as a novel adsorbent targeting positively charged persistent and mobile organic compounds (PMOCs). Moreover, the adsorption efficiency remained high in experiments with real wastewater effluent. Considering practical applications, a RH-silica column could be used to enhance removal of cationic polar compounds. This approach not only improves pollutant removal efficiency but also contributes to sustainability in WWTPs by using agricultural waste resources. Despite significant operational and end-of-life challenges for large-scale implementation, this study represents a crucial advancement in the investigation of RH-silica as an adsorbent.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Alba Rodriguez-Otero reports financial support was provided by European Union. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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