Removal Characteristics and Mechanism
of Mn(II) from Acidic Wastewater Using
Red Mud-Loess Mixture

Lu, Yisi; Liu, Xiaofeng; Yu, Li-yuan; Zhang, Xidong; Duan, Wei; Park, Junboum; Dong, Xiaoqiang

doi:10.15244/pjoes/150386

Cited by 4 publications

(1 citation statement)

References 28 publications

(33 reference statements)

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“…A mild frequency band could be observed at 3280.9 cm -1 in raw red mud. It can be explained as the hydroxylstretching region and H 2 O present in red mud [27]. This band disappeared as the temperature increased and was not present in the other samples of red mud.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 91%

Investigation on Properties and Heavy Metal Ion Extraction of Thermally Activated Red Mud Incorporated Cement Mortar

Athira¹,

Shanmugapriya²

2023

Pol. J. Environ. Stud.

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The manufacturing process of aluminum results in a toxic and highly alkaline by-product, red mud. The chemical composition of red mud varies based on the applied conditions during the production of aluminum. However, hematite (α-Fe 2 O 3 ), goethite (α-FeOOH), boehmite (γ-AlO(OH)), and quartz (SiO 2 ) are the major compounds and calcite (CaCO 3 ) and gibbsite (Al(OH) 3 ) are the minor compounds that constitute in the raw red mud. The characteristic studies conclude that red mud reacting with water molecules releases OHions contributing to high pH. With suitable treatment methods, red mud can be converted into cementitious material and used in the construction industry [1]. As per the studies, red mud calcined

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Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 91%

Investigation on Properties and Heavy Metal Ion Extraction of Thermally Activated Red Mud Incorporated Cement Mortar

Athira¹,

Shanmugapriya²

2023

Pol. J. Environ. Stud.

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Research Investigates and Simulation Behavior of the Failure Characteristics of Red Mud–Loess Type Permeable Reactive Barriers PRB in Fixed‐Bed Column Experiments

Salih,

Xiao,

Dong

2024

Advances in Civil Engineering

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Controlling and remediating water and soil pollution while efficiently utilizing solid waste is essential for comprehensive environmental protection and sustainable development, particularly in establishing green, low‐carbon economic systems in China. We evaluate the impact of initial concentration, flow rate, and bed height on breakthrough performance and adsorption capacity using the Tessier method under dynamic water flow conditions. Additionally, we analyze micromorphological changes in the red mud–loess mixture before and after breakthrough by acid mine drainage containing Pb and Cd in mining areas, employing soil column experiments and numerical simulations with COMSOL Multiphysics. Our findings suggest that reducing initial concentration and flow rate while increasing bed height leads to higher breakthrough time, saturation time, and adsorption capacity for Pb and Cd in the red mud–loess mixture (7 : 3). Furthermore, the red mud–loess blend (7 : 3) demonstrates sustained and efficient acid‐buffering capability in the presence of acid mine drainage containing Pb and Cd. Notably, under specific conditions (initial Pb content at 100 mg/L, a height of 7 cm, and flow rate set at 1 mL/min), the adsorption capacity of red mud–loess (7 : 3) reaches 17.30 mg/g. The prescribed minimum length for PRBs is 11.40 cm. Under specified conditions (Cd concentrations at 100 mg/L, a height of 5 cm, and a flow rate of 1 mL/min), the material exhibits a notable adsorption capacity of 29.91 mg/g, with a theoretical minimum length for PRBs at 8.95 cm. Increasing bed heights successfully remove Pb and Cd ions through chemical precipitation. The BDST model accurately describes the breakthrough curves of Pb and Cd and develops a correlation formula for the breakthrough time of red mud–loess PRB medium. As the saturation of Pb increases from 0.05 to 0.85, the maximum volume adsorption capacity of Pb increases from 1.78 to 2.98 mg/L, while for Cd, it increases from 4.15 to 7.87 mg/L. Elevating the bed height first triggers chemical precipitation, hence improving Pb and Cd removal. Consequently, the longevity of red mud–loess PRB in acidic mine effluent containing Pb and Cd surpasses predicted theoretical outcomes. These observations reveal correlations between the breakthrough length for red mud–loess permeable reactive barriers and the bed height. Furthermore, the distribution of Pb speciation within the red mud–loess mixture (7 : 3) is primarily governed by the presence of iron–manganese oxide, while the composition of Cd speciation is chiefly influenced by the carbonate form and iron–manganese oxide. After treating acidic mine wastewater with Pb and Cd, the red mud–loess mixed material (7 : 3) undergoes surface changes, shifting from smooth to rough due to H+ corrosion. Pores between particles enlarge, yet heavy metal ions, adsorbates, and precipitates reoccupy and cover the surface, transforming the particle morphology from dense lamellar to clustered spherical. Our innovative approach to combining waste materials for environmental remediation presents a cost‐effective and impactful solution for heavy metal pollution.

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Purification of acidic wastewater containing Cd(II) using a red mud–loess mixture: Column test, breakthrough curve, and speciation of Cd

Lu,

Liu,

Zhang

et al. 2024

Water Science &Amp; Technology

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In this study, the safety of a red mud–loess mixture (RM–L) for the remediation of groundwater polluted by acid mine drainage (AMD) containing Cd(II) in mining areas was systematically analyzed and clarified. The effects of the initial concentration, flow rate, and packing height on the breakthrough performance and longevity of RM–L as a permeable reactive barrier (PRB) packing material were explored by column tests. The results show that the breakthrough time, saturation time, and adsorption capacity of Cd(II) in RM–L increased with decreasing initial concentration and flow rate, as well as increasing packing height. Moreover, RM–L had a long-term effective acid buffering capacity for acidic wastewater containing Cd(II). An increase in the packing height led to a longer longevity of the PRB than the theoretical value. In addition, the speciation of Cd on RM–L was dominated by carbonate form and iron–manganese oxide form. The surface of the RM–L particles evolved from a dense lamellar structure to small globular clusters after purifying the acidic wastewater containing Cd(II), due to the corrosion of H+ and the reoccupation and coverage by increasingly enriched adsorbates and precipitates of heavy metal ions.

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Removal Characteristics and Mechanism of Mn(II) from Acidic Wastewater Using Red Mud-Loess Mixture

Cited by 4 publications

References 28 publications

Investigation on Properties and Heavy Metal Ion Extraction of Thermally Activated Red Mud Incorporated Cement Mortar

Investigation on Properties and Heavy Metal Ion Extraction of Thermally Activated Red Mud Incorporated Cement Mortar

Research Investigates and Simulation Behavior of the Failure Characteristics of Red Mud–Loess Type Permeable Reactive Barriers PRB in Fixed‐Bed Column Experiments

Purification of acidic wastewater containing Cd(II) using a red mud–loess mixture: Column test, breakthrough curve, and speciation of Cd

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