Arsenic removal by iron-oxidizing bacteria in a fixed-bed coconut husk column: Experimental study and numerical modeling

Razzak, Abdur; Shafiquzzaman, Md.; Haider, Husnain; Alresheedi, Mohammad T.

doi:10.1016/j.envpol.2020.115977

Cited by 15 publications

(5 citation statements)

References 52 publications

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“…On the other hand, Leptothnix , Thiobacillus , and Hydrogenophaga genera (Figure c), which were abundant in the studied samples, have As(III) oxidative functions, − which may further promote adsorbed or incorporated As oxidation. Therefore, As oxidation may result from both biotic and abiotic ways.…”

Section: Discussionmentioning

confidence: 99%

Oxidative Weathering of Neutral Mine Drainage from Gold Mine Tailings Impoundment: Tracking Formation and Transformation of Biogenic Iron Minerals and the Associated Arsenic

Lu,

Luo,

et al. 2024

ACS Earth Space Chem.

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Globally, tailing impoundment failures frequently occur, making safely held hazardous materials mobile. The pore water within the tailings can have (near-) neutral pH due to acid neutralization before tailings disposal, leading to the generation of neutral mine drainage (NMD) as it leaks from the impoundment. The biogeochemical evolution of key elements, particularly Fe, and the associated mobility of toxic trace metals, including arsenic (As), in these NMD scenarios remain insufficiently explored. In this study, we investigated the oxidative weathering of NMD originating from a gold mine tailings impoundment in Taojiang City, China, where the pH of the sampled tailings' pore water approached neutrality (pH: 6.82). Our observations revealed distinct helically twisted and tubular-like structures of biogenic Fe minerals in suspended particles within the pore water. The dominant Fe-oxidizing bacteria were identified as belonging to the Crenothrix genus. Further characterization identified these biogenic minerals as ferrihydrite (Fh) and amorphous ferric arsenate (AFA). During oxidative weathering, transformations occurred, converting Fh to hematite/goethite and AFA to scorodite. These transformed minerals accumulated as orange-brown precipitates at the impoundment's toe. Arsenite in the pore water underwent complete oxidation to As(V) outside the impoundment. Arsenic was immobilized by biogenic Fe mineral potential through both surface adsorption and structural incorporation mechanisms. Given the prevalence of NMD in mine-impacted areas, the findings of this case study have broad indications for similar environmental settings. The results not only fill knowledge gaps related to Fe biogeochemical cycling but also provide significant guidance for NMD control.

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Section: Discussionmentioning

confidence: 99%

Oxidative Weathering of Neutral Mine Drainage from Gold Mine Tailings Impoundment: Tracking Formation and Transformation of Biogenic Iron Minerals and the Associated Arsenic

Lu,

Luo,

et al. 2024

ACS Earth Space Chem.

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“…They may release Cd, Mn, P from organic material and thereby increase uptake into the rice grain. Higher abundance of Fe-oxidizing bacteria (FeOB) like Gallionella and Pseudomonas in wet season may contribute to the immobilization of As via formation of solid Fe (hydro)oxides minerals (Emerson et al 2013 ; Razzak et al 2021 ). This immobilization may contribute to lower levels of As in wet versus dry season.…”

Section: Discussionmentioning

confidence: 99%

Recycled Household Ash in Rice Paddies of Bangladesh for Sustainable Production of Rice Without Altering Grain Arsenic and Cadmium

et al. 2023

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In Bangladesh most agronomic biomass (straw, husk, dried dung) is burnt for domestic cooking use. Consequently, the soil is continuously stripped of mineral nutrients and carbon (C) substrate. QueryHere we investigate if recycling of household ash (ash) as fertilizer can sustainably improve soil fertility as well as minimise accumulation of toxic elements (As, Cd) in rice grain. Large scale field trials across two geographic regions (Barind, Madhupur) and two seasons (wet, dry) and with application of 3 fertiliser treatments (NPKS, ash, NPKS + ash) were conducted. At the end of each season, the impact of region*season*treatment on soil microbial comunities, rice yield, and grain quality (As, Cd, nutrient elements) was assessed. When compared to conventional field application rates of NPKS (control), application of ash boosted rice yield by circa. 20% in both regions during wet and dry season, with no effect on rice grain carcinogenic inorganic arsenic (iAs), dimethylarsonic acid (DMA) or cadmium (Cd), but with potential to increase zinc (Zn). For soil microbial communities, a significant region and season effect as well as correlation with elements in rice grain was observed, amongst these Cd, Zn, iAs and DMA. This study illustrates that application of ash can reduce the requirement for expensive chemical fertiliser, whilst at the same time increasing rice yield and maintaining grain quality, making farming in Bangladesh more sustainable and productive. The study also implies that the combined impact of region, season, and soil microbes determines accumulation of elements in rice grain.

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“…S-shaped breakthrough curves were observed in the flux range of 40−91 L/m 2 •h (Figure 9A), which are typical for fixed-bed columns. 89 However, due to the difference in scale, the hydraulic residence time in fixed-bed columns is typically in the range of minutes and hours, 89,90 whereas the hydraulic residence time in the HLCM is only a few seconds. In addition, regarding the transport mechanisms in small-scale layers, such as in the case of MF, the axial dispersion could be an important transport mechanism compared to fixed-bed columns.…”

Section: Influence Of Hydraulic Residence Time On Arsenic Adsorptionmentioning

confidence: 99%

Microporous Hematite-Loaded Composite Membrane for Arsenic(III) and Arsenic(V) Removal

Boussouga

Tantish

Schäfer

2023

ACS Appl. Eng. Mater.

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In this work, adsorption and membrane separation were combined to remove adsorbable contaminants from water at lower energy requirements. Such an approach was investigated for arsenic (As) removal with hematite nanoparticles (70 ± 20 nm) immobilized in a microporous (0.2 μm pore size) poly(vinylidene fluoride) (PVDF) membrane. Hematite loading and hydraulic residence time with the role of speciation were investigated for As(III) and As(V) removal using hematite-loaded composite membrane (HLCM). During the flow-through filtration, it was observed 50% removal for As(III), while only 15% As(V) was removed at pH 8 with 2.6 mg/cm2 hematite loading, equivalent to uptakes of 5.5 ± 0.8 μgAs(III)/cm2 and 3.9 ± 0.6 μgAs(V)/cm2. Varying the pH from 2 to 12 and, ultimately, As(III, V) speciation showed a significant impact on the uptake, especially for As(V). In this case, increasing the NaCl concentration from 0.58 to 20 g/L hindered the charge attraction. Arsenic uptake increased with increasing the hematite loading from 0.7 to 3.9 mg/cm2, while the impact of the hydraulic residence time (flux) was observed. Arsenic uptake by this composite membrane requires further improvement in terms of adsorption capacity. Increasing the loading of hematite in the membrane or chemical modifications of hematite to achieve enhanced affinity for As(III, V) will be part of further material modification. From the water treatment perspective, the composite membrane potentially provides effective removal with a lower specific energy consumption compared to nanofiltration.

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Arsenic removal by iron-oxidizing bacteria in a fixed-bed coconut husk column: Experimental study and numerical modeling

Cited by 15 publications

References 52 publications

Oxidative Weathering of Neutral Mine Drainage from Gold Mine Tailings Impoundment: Tracking Formation and Transformation of Biogenic Iron Minerals and the Associated Arsenic

Oxidative Weathering of Neutral Mine Drainage from Gold Mine Tailings Impoundment: Tracking Formation and Transformation of Biogenic Iron Minerals and the Associated Arsenic

Recycled Household Ash in Rice Paddies of Bangladesh for Sustainable Production of Rice Without Altering Grain Arsenic and Cadmium

Microporous Hematite-Loaded Composite Membrane for Arsenic(III) and Arsenic(V) Removal

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