Spatial distribution and leaching behavior of pollutants from phosphogypsum stocked in a gypstack: Geochemical characterization and modeling

Bisone, Sara; Gautier, Mathieu; Chatain, Vincent; Blanc, D.

doi:10.1016/j.jenvman.2017.02.055

Cited by 56 publications

(22 citation statements)

References 22 publications

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“…The high values measured for PG conductivity are related to salts dissolved during tests which can be associated to the lower pH. pH value of PGF sample (2.3) was slightly lower than that of PGA (2.7) without affecting the leaching abilities of both samples because of the fact that pH of the leaching solution is a key parameter in the process [36].…”

Section: Ph and Ec Variation During Leaching Testmentioning

confidence: 92%

“…Samples were leached at a liquid solid (L/S) ratio of 10 L/kg in UPW at 25°C for 24 h under continuous shaking. Then, about 10 mL from the supernatants were withdrawn through 0.45 μm syringe-driven millipore filters (Millex-LH, PTFE, Millipore Corp., France), acidified with HNO 3 acid (5 mol/L) and stored for subsequent chemical analysis by ICP-AES as shown in Bisone et al [36]. Measurements concerned both major and trace elements (e.g.,…”

Section: Batch Leaching Testsmentioning

confidence: 99%

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Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Zmemla

Sdiri

Naifar

et al. 2019

Environmental Engineering Research

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This study has been carried out to evaluate the leaching behavior of Tunisian phosphogypsum (PG) tailings in Skhira city (southern Tunisia). Two PG samples, including old and freshly deposited samples, were characterized in terms of physical, geotechnical, mechanical, chemical and mineralogical properties. Special attention was paid to their leaching behavior when subjected to standard leaching tests. Our results indicated that both samples are mainly composed of more than 31.85% CaO and 31.4% SO3, indicating the predominance of gypsum. This was further confirmed by XRD patterns that revealed the presence of characteristic reflections of gypsum, brushite, quartz and Maladrite. Compressive strength after 90 d exceeded 769 kPa, but still lower than that of natural sand (1,800 kPa). Leaching test was proposed as an appropriate method to determine the released contaminants from PG. The obtained results showed that Fluorine and Phosphorus are the most released elements from PG with 40 and 30%, respectively. The released Se, Cd, and Zn were the only trace elements that exceeded the threshold limits. It seemed that leached element concentrations were independent aging or particle size of the PG. Based on the assessment of leaching behavior, an integrated management approach of the PG deposits was proposed.

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Section: Ph and Ec Variation During Leaching Testmentioning

confidence: 92%

Section: Batch Leaching Testsmentioning

confidence: 99%

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Zmemla

Sdiri

Naifar

et al. 2019

Environmental Engineering Research

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“…It is clear that the specific surface area (SSA) and mean-volume diameter (D [4,3] ) of PG decreased from 0.324 to 0.277 m 2 /g and from 69.935 µm to 66.801 µm, respectively, after water-washing pre-treatment. The particle size fitting formulas of OPG and TPG are shown in Equations (1) and (2). are shown in Figure 6, which illustrates that water washing can effectively optimise the particle size gradation with a difference value of 205.1896.…”

Section: Analysis Of Xrfmentioning

confidence: 99%

“…Normally, PG is mostly composed of calcium sulphate dihydrate (CaSO 4 •2H 2 O) containing some impurities, such as phosphoric acid (H 3 PO 4 ), hydrofluoric acid (HF), heavy metals (Sr, Ba, Cu, Cd, etc. ), and radioactive-elements ( 226 Ra, 238 U) [1,2]. Historically, PG was disposed of on the Earth's surface, which not only wasted a lot of resources, but also caused serious pollution of the atmosphere, soil, and water near the burial locations [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Utilisation of Water-Washing Pre-Treated Phosphogypsum for Cemented Paste Backfill

et al. 2019

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Recycling phosphogypsum (PG) for cemented paste backfill (CPB) has been widely used at phosphate mines in China. However, the impurities in PG prolong the setting time and reduce the uniaxial compressive strength (UCS), limiting the engineering application of PG. This paper aims to investigate the feasibility of treated PG (TPG) washed repeatedly using deionised water (DW) for CPB. A water-washing pre-experiment was first conducted to find the proportion with the least DW demand and the effects of water-washing on ordinary PG (OPG). Then, based on the PG:DW ratio obtained from the pre-experiment, the properties of the OPG-based CPB (OCPB) and TPG-based CPB (TCPB) were tested using slump tests, UCS tests, and microstructural analysis. The results show that (1) after 11 water-washings at the PG:DW ratio of 1:1.75, the pH of the supernatant (pH = 6.328) meets the requirements of Chinese standard GB 8978-1996. (2) Water-washing improves the particle gradation quality of PG and removes the soluble impurities adsorbed at the surface of PG crystals. (3) The initial slump values of TCPB are 0.19–1.15 cm higher than that of OCPB, furthermore, the diffusivity values of TCPB are better than the performance of OCPB, with 0.61–1.68 cm of superiority. (4) The UCS values of TCPB are up to 0.838 MPa, 1.953 MPa, and 2.531 MPa, after curing for 7, 14, and 28 days. These are 0.283 MPa, 0.823 MPa, and 0.881 MPa higher than that of OCPB, respectively. It can be concluded that water-washing pre-treatment greatly improves the workability and mechanical property of PG-based CPB. These results are of great value for creating a reliable and environmentally superior alternative for the recycling of PG and for safer mining production.

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“…Acid Neutralization Capacity & Base Neutralization Capacity ANC-BNC titrations are a promising tool for the quantification of phase alteration and subsequent pollutants release triggered by a source of protons (acidic condition) or a source of alkalinity (basic condition). ANC-BNC titrations have already been used for the quantification of pollutant release as a function of pH for several solid materials like wastes or construction materials [21] [22] [23] [24]. However, applications to urban sediments remain scarce; despite the potential utility of such a tool for the management of urban sediments.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Stability of Major and Trace Element Leaching in Urban Stormwater Sediments

Drapeau¹,

Delolme²,

Chatain³

et al. 2017

OJSS

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Urban sediment generated by stormwater management techniques are highly contaminated with various trace elements. The characterization of trace element speciation and mobility are critical information to improve environmental risk assessment. This study investigates the spatial and temporal variability of major and trace element release from a sedimentary layer in Django Reinhart stormwater infiltration basin (Chassieu, eastern suburbs of Lyon, France). Sampling was conducted for 3 zones and two dates. Chemical characterization was performed (X-Ray diffraction, ICP-AES). The samples were submitted to Acid Neutralization Capacity & Base Neutralization Capacity ANC-BNC tests, according to European standard 14429 (AFNOR, 2015). Solid matrices were mixed with acid or basic solutions and physicochemical parameters and major and trace element release (i.e. Al, Ca, Fe, P, S, Si, Cu, Zn and total carbon) were followed as a function of pH. The results show that the urban sediment has no significant spatial and temporal variability with regards to element release. This observation is all the more surprising that the samples were collected in three contrasting zones regarding stormwater supply and hydric conditions. Element release follows the same trends as a function of pH with a bell-shaped solubilization curve exhibiting the highest solubility at extreme pH values. However, the samples showed slight differences concerning the release of major elements. Such differences are related to slight differences in total mineral contents (organic matter, carbonates…) and chemical composition of the sediments. The results show that despite the varying environmental conditions, the sediment chemical properties can be considered as very stable and uniform over space, dependent mainly on the local geochemical context and watershed characteristics. This study highlights

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Spatial distribution and leaching behavior of pollutants from phosphogypsum stocked in a gypstack: Geochemical characterization and modeling

Cited by 56 publications

References 22 publications

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Utilisation of Water-Washing Pre-Treated Phosphogypsum for Cemented Paste Backfill

Spatial and Temporal Stability of Major and Trace Element Leaching in Urban Stormwater Sediments

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