Continuous bioscorodite crystallization in CSTRs for arsenic removal and disposal

Gonzalez-Contreras, P.A.; Weijma, Jan; Buisman, C.J.N.

doi:10.1016/j.watres.2012.07.055

Cited by 47 publications

(26 citation statements)

References 19 publications

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“…Crystalline and amorphous arsenate ferric compound with high arsenic can be formed in the Fe-As(V)-H 2 O system at pHs ranged from 1 to 3. 1,[16][17][18][19][20] Among them, scorodite (FeAsO 4 $2H 2 O) shows a high stability, 21,22 a high theoretical arsenic content of up to 32%, 23 a less volume of slag and it is easy to separate from the solid-liquid mixture. Scorodite is stable in the mildly acidic environment, while in a neutral to weakly alkaline environment, it can easily decompose and release As into solutions.…”

Section: Introductionmentioning

confidence: 99%

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Wei

et al. 2020

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Wei

et al. 2020

RSC Adv.

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“…The development of passive treatment systems exploiting these microbially mediated processes is a promising strategy for the remediation of As-rich AMD (Hengen et al, 2014; Bruneel et al, 2017). The efficiency of such system was demonstrated in lab-scale bioreactors (González-Contreras et al, 2012; Hedrich and Johnson, 2014; Ahoranta et al, 2016; Fernandez-Rojo et al, 2017). Attempts of in situ treatment are scarce and mainly limited so far to AMD with arsenic concentrations lower than 3 mg L -1 (Whitehead et al, 2005; Macías et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Bacterial Communities Mediating the Treatment of an As-Rich Acid Mine Drainage in a Field Pilot

et al. 2018

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Passive treatment based on iron biological oxidation is a promising strategy for Arsenic (As)-rich acid mine drainage (AMD) remediation. In the present study, we characterized by 16S rRNA metabarcoding the bacterial diversity in a field-pilot bioreactor treating extremely As-rich AMD in situ, over a 6 months monitoring period. Inside the bioreactor, the bacterial communities responsible for iron and arsenic removal formed a biofilm (“biogenic precipitate”) whose composition varied in time and space. These communities evolved from a structure at first similar to the one of the feed water used as an inoculum to a structure quite similar to the natural biofilm developing in situ in the AMD. Over the monitoring period, iron-oxidizing bacteria always largely dominated the biogenic precipitate, with distinct populations (Gallionella, Ferrovum, Leptospirillum, Acidithiobacillus, Ferritrophicum), whose relative proportions extensively varied among time and space. A spatial structuring was observed inside the trays (arranged in series) composing the bioreactor. This spatial dynamic could be linked to the variation of the physico-chemistry of the AMD water between the raw water entering and the treated water exiting the pilot. According to redundancy analysis (RDA), the following parameters exerted a control on the bacterial communities potentially involved in the water treatment process: dissolved oxygen, temperature, pH, dissolved sulfates, arsenic and Fe(II) concentrations and redox potential. Appreciable arsenite oxidation occurring in the bioreactor could be linked to the stable presence of two distinct monophylogenetic groups of Thiomonas related bacteria. The ubiquity and the physiological diversity of the bacteria identified, as well as the presence of bacteria of biotechnological relevance, suggested that this treatment system could be applied to the treatment of other AMD.

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“…It is well established that both scorodite and mansfieldite have significantly lower solubilities compared to their amorphous counterparts [36][37][38]. The formation of scorodite with its low solubility is one of the methods either through direct deposition or through bioformation using bacteria which has received considerable interest in recent years [12,13,15,23,[39][40][41][42].…”

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

X-ray Photoelectron Spectroscopic and Raman microscopic investigation of the variscite group minerals: Variscite, strengite, scorodite and mansfieldite

Kloprogge

Wood

2017

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Several structurally related AsO and PO minerals, were studied with Raman microscopy and X-ray Photoelectron Spectroscopy (XPS). XPS revealed only Fe, As and O for scorodite. The Fe 2p, As 3d, and O 1s indicated one position for Fe, while 2 different environments for O and As were observed. The O 1s at 530.3eV and the As 3d 5/2 at 43.7eV belonged to AsO, while minor bands for O 1s at 531.3eV and As 3d 5/2 at 44.8eV were due to AsO groups exposed on the surface possibly forming OH-groups. Mansfieldite showed, besides Al, As and O, a trace of Co. The PO equivalent of mansfieldite is variscite. The change in crystal structure replacing As with P resulted in an increase in the binding energy (BE) of the Al 2p by 2.9eV. The substitution of Fe for Al in the structure of strengite resulted in a Fe 2p at 710.8eV. An increase in the Fe 2p BE of 4.8eV was found between mansfieldite and strengite. The scorodite Raman OH-stretching region showed a sharp band at 3513cm and a broad band around 3082cm. The spectrum of mansfieldite was like that of scorodite with a sharp band at 3536cm and broader maxima at 3100cm and 2888cm. Substituting Al in the arsenate structure instead of Fe resulted in a shift of the metal-OH-stretching mode by 23cm towards higher wavenumbers due to a slightly longer H-bonding in mansfieldite compared to scorodite. The intense band for scorodite at 805cm was ascribed to the symmetric stretching mode of the AsO. The medium intensity bands at 890, 869, and 830cm were ascribed to the internal modes. A significant shift towards higher wavenumbers was observed for mansfieldite. The strengite Raman spectrum in the 900-1150cm shows a strong band at 981cm accompanied by a series of less intense bands. The 981cm band was assigned to the PO symmetric stretching mode, while the weak band at 1116cm was the corresponding antisymmetric stretching mode. The remaining bands at 1009, 1023 and 1035cm were assigned to υ(A) internal modes in analogy to the interpretation of the AsO bands for scorodite and mansfieldite. The variscite spectrum showed a shift towards higher wavenumbers in comparison to the strengite spectrum with the strongest band observed at 1030cm and was assigned to the symmetric stretching mode of the PO, while the corresponding antisymmetric stretching mode was observed at 1080cm. Due to the band splitting component bands were observed at 1059, 1046, 1013 and 940cm. The AsO symmetric bending modes for scorodite were observed at 381 and 337cm, while corresponding antisymmetric bending modes occurred at 424, 449 and 484cm. Comparison with other arsenate and phosphate minerals showed that both XPS and Raman spectroscopy are fast and non-destructive techniques to identify these minerals based on their differences in chemistry and the arsenate/phosphate vibrational modes due to changes in the symmetry and the unique fingerprint region of the lattice modes.

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Continuous bioscorodite crystallization in CSTRs for arsenic removal and disposal

Cited by 47 publications

References 19 publications

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Disposal of high-arsenic waste acid by the stepwise formation of gypsum and scorodite

Dynamics of Bacterial Communities Mediating the Treatment of an As-Rich Acid Mine Drainage in a Field Pilot

X-ray Photoelectron Spectroscopic and Raman microscopic investigation of the variscite group minerals: Variscite, strengite, scorodite and mansfieldite

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