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The geochemical evolution of brines from phosphogypsum deposits in Huelva (SW Spain) and its environmental implications.

Authors
  • Lieberman, Roy Nir1
  • Izquierdo, Maria2
  • Córdoba, Patricia1
  • Moreno Palmerola, Natalia1
  • Querol, Xavier1
  • Sánchez de la Campa, Ana M3
  • Font, Oriol1
  • Cohen, Haim4
  • Knop, Yaniv5
  • Torres-Sánchez, Raquel3
  • Sánchez-Rodas, Daniel6
  • Muñoz-Quiros, Carmen1
  • de la Rosa, Jesús D3
  • 1 Institute of Environmental Assessment and Water Research (IDÆA), Consejo Superior de Investigaciones Cientificas (CSIC), 18-23 Jordi Girona, 08034 Barcelona, Spain. , (Spain)
  • 2 Institute of Environmental Assessment and Water Research (IDÆA), Consejo Superior de Investigaciones Cientificas (CSIC), 18-23 Jordi Girona, 08034 Barcelona, Spain. Electronic address: [email protected] , (Spain)
  • 3 Associate Unit-University of Huelva "Atmospheric Pollution", Center for Research in Sustainable Chemistry - CIQSO, University of Huelva, Campus de El Carmen s/n, E-21071 Huelva, Spain; Department of Earth Science, University of Huelva, Campus El Carmen E21007, Huelva, Spain. , (Spain)
  • 4 Department of Chemical Sciences, Ariel University, Ariel 40700, Israel. , (Israel)
  • 5 Department of Civil Engineering, Ariel University, Ariel 40700, Israel. , (Israel)
  • 6 Associate Unit-University of Huelva "Atmospheric Pollution", Center for Research in Sustainable Chemistry - CIQSO, University of Huelva, Campus de El Carmen s/n, E-21071 Huelva, Spain. , (Spain)
Type
Published Article
Journal
The Science of the total environment
Publication Date
Jan 15, 2020
Volume
700
Pages
134444–134444
Identifiers
DOI: 10.1016/j.scitotenv.2019.134444
PMID: 31689656
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The present study focuses on the geochemistry of large phosphogypsum deposits in Huelva (SW Spain). Phosphogypsum slurry waste from fertiliser production was disposed in large ponds containing aqueous waste (i.e. brines) and exposed to weathering. These evaporation ponds were found to be dynamic environments far from attaining steady state conditions where a number of trace pollutants are subjected to temporal variations in response to changing environmental conditions. Chemical, mineralogical and morphological data were used to improve our understanding on the dynamics of a large number of elements in the phosphogypsum-brine-evaporation deposits system. Weekly sampling of brines over the course of 1 yr indicated a substantial enrichment in potentially harmful elements (e.g. As, Cr, Cu, F, Ni, U, V, Zn) present in time-dependent concentrations. The evaporation deposits formed multi-layered precipitates of chlorides, sulphates, phosphates and fluorides containing a large number of pollutants in readily soluble forms. The precipitation sequence revealed a time-dependent composition reflecting alternating precipitation and re-dissolution processes associated with seasonal changes in the local weather conditions. Concatenation of precipitation/re-dissolution stages was found to progressively enrich the brines in pollutants. These findings were supported by the observations from a tank experiment simulating the phosphogypsum-brine-evaporation deposits system under laboratory conditions. Given the substantially high concentrations of pollutants present in mobile forms in the brine-salt system, actions to abate these compounds should be implemented. Copyright © 2019 Elsevier B.V. All rights reserved.

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