October 16, 2026 Dataset Open Access

Kantamani, Rama Swami; Kelly, Norman; Chaouki, Boucena; Ebert, Doreen; Fischer, Ulrike; Frank, Haubrich; Sebastian, Braune; Roland, Haseneder; Patil, Ajay Bhagwan

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    <subfield code="a">Data publication: Nanofiltration investigations on tailings flotation residue wastewater for metal preconcentration and water decontamination</subfield>
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    <subfield code="a">&lt;p&gt;Flotation is one of the most effective methods for processing ore and tailings. The water generated during various stages of the flotation process contains significant amounts of metal ions, which cause environmental concerns. The present study focuses on the employment of the nanofiltration membrane process with flat sheet polymeric polyamide thin flim composite membranes namely DK and DL containing molecular weight cutoff of 100-300 Da, for the effective removal of metal ions such as Zn (II), Fe (II, III), Cu (II), Al (III), Cu (II), Cd(II) having concentrations of around 400 mg/L, 10 mg/L, 25 mg/L, 180 mg/L, 540 mg/L and 6 mg/L, respectively, from the flotation residue waste washwater as a function of various experimental parameters. The parameters include the effect of pH(2-3), pressure (15-20 bar), volume (2-6 L), flow rate (2-6 L/min), temperature (20-40 &amp;ordm;C), different membranes, and membrane stacking. In addition, we explored the process for obtaining the pre-concentration of metals in the retentate for further separation. Furthermore, the number of cycles needed to complete the removal of the investigated metal ions from flotation residue waste washwater was studied in detail. The results show that higher rejection of 85- 95% of multivalent metal ions was achieved for all the parameters, with concentrations decreasing in the range of 1- 20 mg/L after studies for different metal ions, and complete decontamination of the investigated metal ions, i.e less than 1 mg/L, was achieved within two nanofiltration cycles at 20 bar operating pressure. The metal ion concentrations in the permeate were below the applicable regulatory limit values published in environmental policies and regulations by the WHO and German authorities. Furthermore, the preconcentration of Zn(II) reached about 4 g/L, with a 500% concentration enrichment in two cycles in the retentate studies. The nanofiltration membrane process is an efficient method for treating water from metal production or recycling, as well as for concentrating metals for further recovery. Therefore, it offers numerous advantages for the water circular economy for complete decontamination and metal recovery from metal-containing wastewater streams, to make overall tailings management more sustainable.&lt;/p&gt;</subfield>
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