Particle size control of biogenic scorodite during the GAC-catalysed As(III) oxidation for efficient arsenic removal in acid wastewaters

Vega-Hernandez, Silvia; Weijma, Jan; Buisman, C.J.N.

doi:10.1016/j.wri.2020.100128

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…Scorodite is considered one of the suitable forms for the final disposal of As, owing to its high thermodynamic stability [ 66 ]. As(III) is the predominant species in metallurgical residues, and the production of bioscorodite has been considered as a strategy for As removal [ 67 ]. Previous studies have evaluated the crystallization of scorodite using Acidianus sulfidivorans in the absence of primary minerals or seed crystals [ 12 ].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, Tanaka and Okibe (2018) [ 70 ] have described a process for scorodite production through the oxidation of As and Fe using the extremophile archaea Acidianus brierley . Additionally, Vega-Hernández et al (2020) [ 67 ] have reported the use of granular activated carbon to oxidize As under thermoacidophilic conditions in the presence of air.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Micro-Nanobubbles on Arsenic Removal by Trichoderma atroviride for Bioscorodite Generation

Morales-Mendoza,

Flores-Trujillo,

Ramírez-Castillo

et al. 2023

JoF

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The global environmental issue of arsenic (As) contamination in drinking water is a significant problem that requires attention. Therefore, the aim of this research was to address the application of a sustainable methodology for arsenic removal through mycoremediation aerated with micro-nanobubbles (MNBs), leading to bioscorodite (FeAsO4·2H2O) generation. To achieve this, the fungus Trichoderma atroviride was cultivated in a medium amended with 1 g/L of As(III) and 8.5 g/L of Fe(II) salts at 28 °C for 5 days in a tubular reactor equipped with an air MNBs diffuser (TR-MNBs). A control was performed using shaking flasks (SF) at 120 rpm. A reaction was conducted at 92 °C for 32 h for bioscorodite synthesis, followed by further characterization of crystals through Fourier–Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD) analyses. At the end of the fungal growth in the TR-MNBs, the pH decreased to 2.7–3.0, and the oxidation-reduction potential (ORP) reached a value of 306 mV at 5 days. Arsenic decreased by 70%, attributed to possible adsorption through rapid complexation of oxidized As(V) with the exchangeable ferrihydrite ((Fe(III))4-5(OH,O)12), sites, and the fungal biomass. This mineral might be produced under oxidizing and acidic conditions, with a high iron concentration (As:Fe molar ratio = 0.14). The crystals produced in the reaction using the TR-MNBs culture broth and characterized by SEM, XRD, and FTIR revealed the morphology, pattern, and As-O-Fe vibration bands typical of bioscorodite and römerite (Fe(II)(Fe(III))2(SO4)4·14H2O). Arsenic reduction in SF was 30%, with slight characteristics of bioscorodite. Consequently, further research should include integrating the TR-MNBs system into a pilot plant for arsenic removal from contaminated water.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%