Characterization of the role of phosphogypsum foam in the transport of metals and radionuclides in the Southern Mediterranean Sea

Zrelli, Radhouan El; Rabaoui, Lotfi; Abda, Heithem; Daghbouj, N.; Pérez‐López, Rafael; Castet, Sylvie; Aigouy, Thierry; Bejaoui, Nejla; Courjault‐Radé, Pierre

doi:10.1016/j.jhazmat.2018.09.083

Cited by 58 publications

(7 citation statements)

References 29 publications

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“…It was estimated that about 87% of the radiation doses received by humans are from natural sources, produced by radioactive isotopes of 238 U and 232 Th in addition to their progeny and 40 K (UNSCEAR, 2008; Shetty & Narayana, 2010). The effects of radiation on humans and biota vary according to the radiation type (α or β or γ), the time of exposure, the dose, and the exposure route (external, inhalation, and ingestion) (ATSDR, 1988;INRS, 2012;El Zrelli et al, 2019). A long exposure period leads to a greater risk of cancer (including lung, breast, and thyroid glands) that usually appear after decades of exposure (UNSCEAR, 2000).…”

Section: Radiation Hazards Radionuclides Dose Rate Cancer Risk the Re...mentioning

confidence: 99%

Distribution of Natural radionuclides and its Associated Hazards in the Valleys Coastline of the Red Sea, Egypt

Madkour¹

2022

Egypt. J. of Aquatic Biolo. and Fish.

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Radioactivity from naturally occurring radioactive materials (NORMs) is ubiquitous in the terrestrial environment and exists in various geological formations, viz. soils, rocks, sediment, air, and construction materials (Ramasamy et al., 2013; Abbasi et al., 2022). However, the distribution of NORMs in the terrestrial and coastal sediments relies on both the distribution of rocks and the procedures through which they are concentrated. Noureddine et al. (1998) and Mahur et al. (2010) reported that, the major source of natural radionuclides in the aquatic environment results from the weathering and recycling of terrestrial minerals and rocks that give rise to 40 K, 232 Th and 238 U in marine sediments (Zakaly et al., 2021).

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Section: Radiation Hazards Radionuclides Dose Rate Cancer Risk the Re...mentioning

confidence: 99%

Distribution of Natural radionuclides and its Associated Hazards in the Valleys Coastline of the Red Sea, Egypt

Madkour¹

2022

Egypt. J. of Aquatic Biolo. and Fish.

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“…В частности, в процессе производства фосфорной кислоты для дальнейшей переработки в фосфорсодержащие удобрения из апатитового сырья образуется фосфогипс. Многотоннажные отвалы фосфогипса занимают значительные площади и приводят к нарушениям экосистемы [1,2]. Актуальной задачей химической технологии неорганических веществ является разработка основ способа вовлечения в процессы переработки данных отходов производства.…”

Section: Introductionunclassified

Technology for processing phosphogypsum into a fluorescent dye based on calcium sulfide

Medennikov

Shabelskaya

2022

Fine Chem. Technol.

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Objectives. There is considerable economic demand for products obtained by processing phosphogypsum. In particular, calcium sulfide-based materials having luminescent properties are the object of intensive study due to the wide range of possibilities for their use. The alloying of the structure of calcium sulfide with cations of rare earth elements leads to the appearance of a glow having various colors. However, the high cost of such phosphorescent materials is due to the high chemical purity of the reagents required for their synthesis. The development of efficient methods for obtaining calcium sulfide-based luminescent materials from phosphogypsum is part of an integrated approach to solving the problem of synthesizing economically demanded materials from production waste.Methods. The synthesized materials were studied using X-ray phase analysis and scanning electron microscopy. Photos of the samples were taken under illumination with an incandescent lamp or a fluorescent ultraviolet lamp.Results. According to X-ray phase analysis, phosphogypsum is mainly comprised of calcium sulfate dihydrate and calcium sulfate hemihydrate. Heat treatment of a phosphogypsum sample at a temperature of 1073 K is accompanied by the formation of anhydrous calcium sulfate. In the presence of a reducing agent, a composite material is formed containing a phase of anhydrous calcium sulfate and calcium sulfide. Due to the calcium sulfide content, phosphogypsum has luminescent properties when heat-treated in the presence of various reducing agents, including activated carbon, wood charcoal, vegetable oil, citric acid, starch, and sucrose.Conclusions. Optimal technological conditions for obtaining a composite material exhibiting luminescent properties are revealed. The successful synthesis of phosphor from without nonpretreated phosphogypsum is demonstrated. Optimal technological conditions for obtaining a composite material exhibiting luminescent properties are as follows: heat treatment temperature is 1073–1173 K; isothermal holding time is 60 min; reducing agent quantity is 37–50% (mol). The study results are widely applicable to processing wastes obtained from large-scale chemical production involving the production of a highly demanded inorganic product.

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“…This is a significant environmental problem, especially in the Atlantic Ocean around two locations: Safi and Yorf Lasfar, where the Moroccan phosphate industry emits large quantities of this waste [9]. A study [10] characterized the formed layers of foam from the discharge of phosphogypsum into coastal waters, which can float on the surface and be passively transported to remote areas to understand their role in the behavior of pollutants in the marine environment [10].…”

Section: Introductionmentioning

confidence: 99%

Phosphogypsum Recycling: A Review of Environmental Issues, Current Trends, and Prospects

et al. 2021

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The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and atmosphere. Therefore, this paper analyzes the directions of phosphogypsum recycling and possible alternatives to its use. The main disadvantages of the existing methods of phosphogypsum processing were identified and trends in this waste management were also considered. Through the VOSviewer programme, a visualization of cluster interconnections was carried out in research publications of various fields of phosphogypsum utilization. Five clusters were formed: a red cluster—phosphogypsum recycling in the construction industry; green cluster—radiation pollution problem of phosphogypsum and phosphate fertilizers; yellow cluster—monitoring migration of phosphogypsum components in the ecosystem, with the mobile forms of heavy metals and their inflow into aquifers from phosphogypsum dumps; blue cluster—use of phosphogypsum in agriculture as an ameliorant and a component of fertilizer; and a purple cluster—the impact of phosphogypsum on microorganisms, particularly in bioremediation processes. Under the proposed integrated biochemical approach, the use of various bioprocesses of phosphogypsum recovery from waste dumps and implementation of new biotechnological solutions for processing phosphorus raw materials are presented.

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Characterization of the role of phosphogypsum foam in the transport of metals and radionuclides in the Southern Mediterranean Sea

Cited by 58 publications

References 29 publications

Distribution of Natural radionuclides and its Associated Hazards in the Valleys Coastline of the Red Sea, Egypt

Distribution of Natural radionuclides and its Associated Hazards in the Valleys Coastline of the Red Sea, Egypt

Technology for processing phosphogypsum into a fluorescent dye based on calcium sulfide

Phosphogypsum Recycling: A Review of Environmental Issues, Current Trends, and Prospects

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