A new approach of aluminum extraction from drinking water treatment sludge using ammonium sulfate roasting process

Ballou, Ibtissam; Kounbach, Said; Naja, Jamal; Bakher, Zine Elabidine; Laraki, Khalid; Raibi, Fatima; Saadi, Radouan; Kholtei, Sanae

doi:10.1016/j.mineng.2022.107859

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…The recovery of Al or Fe from DWTR can be done by different techniques such as acidification, 2,14,17,50–52 alkalization, 14 roasting 53 dialysis or ultrafiltration, 1 or adsorptive capacity can be improved through redox actions such as oxygen-limiting treatment. 54 This allows the possibility of repeating the coagulation process of the two metals Al and Fe (often as sulfates) for efficient reuse as adsorbents to remove either turbidity, total suspended solids, chemical oxygen demand, or phosphorus from various wastewater.…”

Section: Adsorption: Simplified Mechanisms and Main Controlling And L...mentioning

confidence: 99%

Re-utilization of drinking water treatment residuals (DWTR): a review focused on the adsorption of inorganic and organic contaminants in wastewater and soil

Belzile,

Chen

2024

Environ. Sci.: Water Res. Technol.

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Section: Adsorption: Simplified Mechanisms and Main Controlling And L...mentioning

confidence: 99%

Re-utilization of drinking water treatment residuals (DWTR): a review focused on the adsorption of inorganic and organic contaminants in wastewater and soil

Belzile,

Chen

2024

Environ. Sci.: Water Res. Technol.

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“…Aluminum extracted from drinking water treatment sludge by thermochemical treatment with ammonium sulfate was the subject of our study for the synthesis of γ-AlOOH and γ-Al2O3 [14].…”

Section: Pseudo-boehmite (γ-Alooh) and Gamma Alumina (γ-Al2o3) Oxide ...mentioning

confidence: 99%

“…Thus, aluminum recovered from aluminum sludge should be a more attractive candidate from an economic and environmental point of view. For this purpose, aluminum sludge has been thermo-chemically treated and solubilized with distilled water to extract aluminum [14].…”

Section: Introductionmentioning

confidence: 99%

“…Pseudo-Boehmite (γ-AlOOH) and Gamma Alumina (γ-Al 2 O 3 ) Oxide Preparation Aluminum extracted from drinking water treatment sludge by thermochemical treatment with ammonium sulfate was the subject of our study for the synthesis of γ-AlOOH and γ-Al 2 O 3[14].The resulting solution was heated to 80 • C. The pH was adjusted to 13 by adding NaOH solution (5 M) drop by drop for 40 min, which transformed Al(OH) 3 into Al(OH)4 …”

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confidence: 99%

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Adsorption of Eriochrome Black T on Pseudo Boehmite and Gamma Alumina Synthesized from Drinking Water Treatment Sludge: A Waste-to-Recycling Approach

Ballou,

Naja,

Bakher

et al. 2024

Recycling

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Eriochrome black T is considered as one of the anionic dyes with potential harmful effects on human health and the environment. Among other processes, adsorption can contribute to the removal of these dyes. In the present study, two adsorbent materials, pseudo-boehmite (γ-AlOOH) and gamma alumina (γ-Al2O3), were synthesized and tested in the removal of the Eriochrome black T molecule (EBT). γ-AlOOH and γ-Al2O3 were obtained by precipitation from NaAlO2 solution at pH = 7, at a temperature of 80 °C, and by the thermal transformation of γ-AlOOH at 800 °C, respectively. In order to gain insights into the structural, chemical, thermal and morphological properties of these materials, numerous analytical techniques were involved, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), differential thermogravimetric–thermal analysis (TGA-DTA), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and specific surface area measurement using the Brunauer–Emmett–Teller (BET) method. Several adsorption parameters were studied, such as the adsorbent dose, initial concentration, pH, contact time and reaction temperature. The kinetic study showed that EBT adsorption follows the pseudo-second-order model. The Langmuir isotherm model revealed a maximum EBT adsorption capacity of 344.44 mg g−1 and 421.94 mg g−1 for γ-AlOOH and γ-Al2O3, respectively. A textural and structural analysis after adsorption highlighted the effective adsorption of the dye.

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Thermogravimetry as a research tool for the development of an ammonium sulphate roasting process for selective metal extraction from minerals

Castleman,

Doucet,

Roos

et al. 2024

J Therm Anal Calorim

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The ammonium sulphate roasting process involves reacting mineral-bearing materials with ammonium sulphate via a solid–solid roasting process and subjecting the resulting roast residue to aqueous leaching. This process enables the simultaneous, non-selective co-extraction of strategic metals from the starting materials. However, effective separation of the extracted metals is often mandatory to produce quality products of high purity. In this study, the combined application of thermogravimetric analysis, X-ray powder diffraction and inductively coupled plasma optical emission spectrometry confirmed the non-selectivity of the process when applied to a South African diamond mine residue residue roasted with ammonium sulphate in a 1:2 mass ratio (m/m) at 450 °C for 2 h, with magnesium, iron and aluminium being co-extracted into water-soluble metal sulphates. Thermogravimetry was then applied to develop a multi-step, multi-temperature selective roasting process using mixtures of pure commercial metal sulphate salts. The first step of the modified process successfully separated iron and aluminium sulphates from magnesium-sulphates in the roast residues by thermally decomposing soluble iron and aluminium sulphates into insoluble oxides via calcination at 750 °C for 2 h. This temperature was lower than the one at which magnesium sulphates convert into magnesium oxide. In the second and final step, iron and aluminium were recovered from the oxide minerals via solid–solid re-roasting with ammonium sulphate at 450 °C for 1 h, causing the oxides to revert back to their water-soluble sulphate forms. The effectiveness of the modified process was subsequently verified using a diamond mine residue, showing that the soluble iron and aluminium contents in the magnesium-bearing leachate could be reduced by over 90%.

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A new approach of aluminum extraction from drinking water treatment sludge using ammonium sulfate roasting process

Cited by 8 publications

References 46 publications

Re-utilization of drinking water treatment residuals (DWTR): a review focused on the adsorption of inorganic and organic contaminants in wastewater and soil

Re-utilization of drinking water treatment residuals (DWTR): a review focused on the adsorption of inorganic and organic contaminants in wastewater and soil

Adsorption of Eriochrome Black T on Pseudo Boehmite and Gamma Alumina Synthesized from Drinking Water Treatment Sludge: A Waste-to-Recycling Approach

Thermogravimetry as a research tool for the development of an ammonium sulphate roasting process for selective metal extraction from minerals

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