Abstract

BEDOYA-BETANCUR, Santiago A. et al. Adsorption of heavy metals in non-domestic wastewater using banana agro-industrial waste. Rev. ion [online]. 2023, vol.36, n.2, pp.15-32.  Epub Oct 21, 2024. ISSN 0120-100X.  https://doi.org/10.18273/revion.v36n2-2023002.

The removal of heavy metals (Zn, Ni, Fe, Cu and Cr) in real non-domestic wastewater (NDWW) from the electroplating industry (Medellín, Colombia) was studied in a batch system using peel biomass (BCB) and banana pseudostem (BPT) obtained by simple physical processes. The results were compared with a commercial activated carbon (CAC). The adsorbents were characterized through FTIR, BET, Isoelectric point, Boehm and XRD, showing little variation towards BCB and BPT materials in terms of chemical composition, morphology and structure. The physicochemical properties of ARnD were also determined prior to adsorption treatment, finding an initial concentration of 18.73 mg/L, 10.1 mg/L, 11.2 mg/L, 36.7 mg/L and 0.44 mg/L by atomic absorption spectrophotometry for Zn, Ni, Fe, Cu and Cr, respectively. These values were compared with the Colombian regulations Resolution 0631 of 2015, where it was evidenced that they exceed the maximum permissible limits established. Adsorption tests were carried out at room temperature, pH of 3.65 and 200 rpm varying the amount of adsorbent (1 - 5 mg) for a time of 2 h. The maximum removal percentages were 42.69 %, 83.10 %, 95.17 %, 81.90 % and 99.82 % for Fe, Ni, Fe, Cu, Zn and Cr, respectively. It is observed that the values achieved with the bioadsorbents are similar to commercial charcoal, suggesting that banana residues could be a low-cost alternative for the treatment of this type of effluent.

Keywords : Banana peel; Banana pseudostem; Bioadsorbent; Wastewater; Electroplating; Adsorption.

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