Removal of Metals from Aqueous Solutions Using Sea Buckthorn Waste from Dietary Supplement Technology

Lidia Kim, Gina-Alina Catrina (Traistaru), Georgiana Cernica, Vasile Staicu, Mariana Popescu and Cristina Ileana Covaliu
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Lidia Kim: National Research and Development Institute for Industrial Ecology—ECOIND, 060652 Bucharest, Romania
Gina-Alina Catrina (Traistaru): National Research and Development Institute for Industrial Ecology—ECOIND, 060652 Bucharest, Romania
Georgiana Cernica: National Research and Development Institute for Industrial Ecology—ECOIND, 060652 Bucharest, Romania
Vasile Staicu: S.C. Hofigal Export-Import S.A., 042124 Bucharest, Romania
Mariana Popescu: S.C. Hofigal Export-Import S.A., 042124 Bucharest, Romania
Cristina Ileana Covaliu: Faculty of Biotechnical Systems Engineering, University Politehnica of Bucharest, 060042 Bucharest, Romania

Sustainability, 2021, vol. 13, issue 3, 1-16

Abstract: The purpose of this study was to produce additional data for the valorization process of vegetable waste originating from dietary supplement technology. Two types of vegetable waste originating from different technological processes of sea buckthorn oil were used: vegetable waste from organic solvent extraction (P1) and vegetable waste from cold extraction (P2). Batch experiments evaluated the influence of pH, initial metal concentration, contact time, and Langmuir and Freundlich adsorption isotherms. The following pollutants—Cu, Cr, Co, Ni, Pb and Zn—from the wastewater were studied. The removal efficiency of metals from wastewater was evaluated at pH 3, 5 and 7. The highest metals removal efficiency was obtained at pH 5. It was observed that the Langmuir isotherm fits the adsorption process very well. Based on the results obtained, it can be concluded that vegetable waste resulting from the sea buckthorn oil industry could have potential applications for removing toxic metals from wastewater due to its high removal efficiency (>80%).

Keywords: adsorbent materials; metals; removal efficiency; vegetable waste; valorization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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