A Study of the Effect of Red Mud Amendments on the Growth of Cyanobacterial Species

Dubey, K. P.

doi:10.1080/10889868.2011.598483

Cited by 13 publications

(14 citation statements)

References 34 publications

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“…The role of photosynthetic algae in the bioremediation of elements from red mud has not been studied in detail. However, several cyanobacteria and fungi have been tested for bio-leaching of bauxite residue [19,24]. Cyanobacteria were found to be less efficient in the re-vegetation of red mud field deposits than fungi because they suffered more under alkaline conditions and a total lack of energy sources.…”

Section: Discussionmentioning

confidence: 99%

“…Cyanobacteria were found to be less efficient in the re-vegetation of red mud field deposits than fungi because they suffered more under alkaline conditions and a total lack of energy sources. But if the pH was reduced they formed a crust-like structure on the red mud surface [24]. In contrast, fungi were less vulnerable to harsh conditions of red mud, and could even excrete metabolites (such as organic acids, amino acids, and proteins) and form complexes with metal ions.…”

Section: Discussionmentioning

confidence: 99%

“…Dried or carbonized biomass of the green alga Parachlorella was used for bio-sorption and reversible desorption of lanthanides from aqueous solution [23]. Studies of bio-remediation of red mud were performed with the cyanobacterial species Phormidium and Oscillatoria [24]. Results indicated that these microorganisms were able to reach a high growth rate in the presence of red mud-supplemented nutrient medium.…”

Section: Introductionmentioning

confidence: 99%

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Bio-mining of Lanthanides from Red Mud by Green Microalgae

et al. 2019

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Red mud is a by-product of alumina production containing lanthanides. Growth of green microalgae on red mud and the intracellular accumulation of lanthanides was tested. The best growing species was Desmodesmus quadricauda (2.71 cell number doublings/day), which accumulated lanthanides to the highest level (27.3 mg/kg/day), if compared with Chlamydomonas reinhardtii and Parachlorella kessleri (2.50, 2.37 cell number doublings and 24.5, 12.5 mg/kg per day, respectively). With increasing concentrations of red mud, the growth rate decreased (2.71, 2.62, 2.43 cell number doublings/day) due to increased shadowing of cells by undissolved red mud particles. The accumulated lanthanide content, however, increased in the most efficient alga Desmodesmus quadricauda within 2 days from zero in red-mud free culture to 12.4, 39.0, 54.5 mg/kg of dry mass at red mud concentrations of 0.03, 0.05 and 0.1%, respectively. Red mud alleviated the metal starvation caused by cultivation in incomplete nutrient medium without added microelements. Moreover, the proportion of lanthanides in algae grown in red mud were about 250, 138, 117% higher than in culture grown in complete nutrient medium at red mud concentrations of 0.03, 0.05, 0.1%. Thus, green algae are prospective vehicles for bio-mining or bio-leaching of lanthanides from red mud.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bio-mining of Lanthanides from Red Mud by Green Microalgae

et al. 2019

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“…Over the last 60 years, scientists have made an effort to seek practical approaches for bauxite residue (BR) utilization, ranging from agriculture, metal extraction, rare earth element recovery, and applications as a component of construction materials . BR is a residue generated by the alumina refinery industry using the Bayer process, the sintering process, and the combined process (a combination of Bayer and sintering processes).…”

Section: Introductionmentioning

confidence: 99%

Revealing the Mechanisms of Metal Adsorption by Bauxite Residue

Peng

Vaughan

et al. 2023

Ind. Eng. Chem. Res.

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Acid treatment of bauxite residue (BR) has been one of the main approaches to enhance its metal adsorption performance. However, the acid treatment mechanisms remain poorly understood and is complicated by the variable and complex mineralogy of bauxite residue and different test conditions in previous studies. In this study, bauxite residue samples were treated with aqueous HCl solutions, with concentrations ranging from 0 to 0.25 M. The dissolution kinetics of the major elements (Na, Al, Ca, Fe, and Si) and target metals (Pb 2+ and Cu 2+ ) for ion exchange and adsorption performance were measured. The solid samples were examined using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) cross-sectional elemental mapping to determine the reaction mechanisms. The results revealed that the adsorption performance decreased with increasing acid concentrations, which is related to the structural changes of the sodalite phase. Other mineral phases, such as hematite, boehmite, and quartz, play a minor role in the adsorption. Additionally, different adsorption mechanisms between Pb 2+ and Cu 2+ were revealed, which were related to surface disruption.

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“…Red mud is highly alkaline due to the addition of sodium hydroxide (NaOH) during the production process and contains metal oxides and elevated concentrations of a range of minor trace elements − that can be toxic to aquatic organisms. Initial research after the Ajka accident focused on the short-term impact of the pollution on freshwaters.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Legacy of Red Mud Pollution in a Shallow Freshwater Lake: Arsenic Accumulation and Speciation in Macrophytes

Olszewska

Meharg

Heal

et al. 2016

Environ. Sci. Technol.

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Little is known about long-term ecological responses in lakes following red mud pollution. Among red mud contaminants, arsenic (As) is of considerable concern. Determination of the species of As accumulated in aquatic organisms provides important information about the biogeochemical cycling of the element and transfer through the aquatic food-web to higher organisms. We used coupled ion chromatography and inductively coupled plasma mass spectrometry (ICP-MS) to assess As speciation in tissues of five macrophyte taxa in Kinghorn Loch, U.K., 30 years following the diversion of red mud pollution from the lake. Toxic inorganic As was the dominant species in the studied macrophytes, with As species concentrations varying with macrophyte taxon and tissue type. The highest As content measured in roots of Persicaria amphibia (L.) Gray (87.2 mg kg(-1)) greatly exceeded the 3-10 mg kg(-1) range suggested as a potential phytotoxic level. Accumulation of toxic As species by plants suggested toxicological risk to higher organisms known to utilize macrophytes as a food source.

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A Study of the Effect of Red Mud Amendments on the Growth of Cyanobacterial Species

Cited by 13 publications

References 34 publications

Bio-mining of Lanthanides from Red Mud by Green Microalgae

Bio-mining of Lanthanides from Red Mud by Green Microalgae

Revealing the Mechanisms of Metal Adsorption by Bauxite Residue

Assessing the Legacy of Red Mud Pollution in a Shallow Freshwater Lake: Arsenic Accumulation and Speciation in Macrophytes

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