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Experimental and numerical study of biochar fixed bed column for the adsorption of arsenic from aqueous solutions

TitleExperimental and numerical study of biochar fixed bed column for the adsorption of arsenic from aqueous solutions
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2021
AuthorsBoni, M.R., Marzeddu S., Tatti F., Raboni M., Mancini G., Luciano Antonella, and Viotti P.
JournalWater (Switzerland)
KeywordsAdsorbing materials, Adsorption, Adsorption of arsenics, aqueous solution, arsenic, biochar, detection method, dispersion, Efficiency, efficiency measurement, Experimental and numerical studies, experimental study, Fixed bed columns, groundwater, Groundwater pollution, hydraulic conductivity, isotherm, Italy, Its efficiencies, Kinetic constant, laboratory test, numerical method, numerical model, Permeable reactive barriers

Two laboratory tests were carried out to verify the suitability of an Italian commercial biochar as an adsorbing material. The chosen contaminant, considered dissolved in groundwater, was As. The circular economic concept demands the use of such waste material. Its use has been studied in recent years on several contaminants. The possibility of using an efficient material at low cost could help the use of low-impact technologies like permeable reactive barriers (PRBs). A numerical model was used to derive the kinetic constant for two of the most used isotherms. The results are aligned with others derived from the literature, but they also indicate that the use of a large amount of biochar does not improve the efficiency of the removal. The particular origin of the biochar, together with its grain size, causes a decrease in contact time required for the adsorption. Furthermore, it is possible that a strong local decrease in the hydraulic conductibility does not allow for a correct dispersion of the flow, thereby limiting its efficiency. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.


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Citation KeyBoni2021