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Remediation experiment of Ecuadorian acid mine drainage: geochemical models of dissolved species and secondary minerals saturation

2019-12Artigo científico Acesso restrito
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dc.contributor.authorDelgado, J
dc.contributor.authorBarba-Brioso, Cinta
dc.contributor.authorAyala, Diana
dc.contributor.authorBoski, T.
dc.contributor.authorTorres, Sandra
dc.contributor.authorCalderon, Edmundo
dc.contributor.authorLopez, Flavio
dc.date.accessioned2020-07-24T10:51:14Z
dc.date.available2020-07-24T10:51:14Z
dc.date.issued2019-12
dc.description.abstractAcid mine drainage is one of the main environmental hazards to ecosystems worldwide and it is directly related to mining activities. In Ecuador, such acidic-metallic waters are drained to rivers without treatment. In this research, we tested a laboratory combined (Ca-Mg) Dispersed Alkaline Substrate (DAS) system as an alternative to remediate acid drainage from the Zaruma-Portovelo gold mining site, at El Oro, Ecuador. The system worked at low and high flow hydraulic rates during a period of 8 months, without signs of saturation.. Analysis of physico-chemical parameters and water composition (ICP-OES, ICP-MS) demonstrated that treatment effectively increased water pH and promoted the retention of about 80% of Fe, Al, Mn and Cu. Under acid conditions As, Cr and Pb concentrations decreased with Fe and possible precipitation of jarosite and schwertmannite. However, the homogeneous depletion of Cr at pH above 6 could be related to ferrihydrite or directly with Cr (OH)(3) precipitation. After DAS-Ca, sulphate, phosphate and rare earth elements (REE) concentrations decreased to 1912, 0.85 and 0.07 mg/L respectively, while DAS-Mg contributed to form a complex model of minor carbonate and phosphate phases as main sink of REE. DAS-Mg also promoted the retention of most divalent metals at pH values over seven. Thus, this low cost treatment could avoid environmental pollution and international conflicts. Anyway, further investigations are needed to obtain higher Zn retention values.
dc.description.sponsorshipPROMETEO Ecuadorian program (Secretary of Superior Education, Science, Technology and Innovation)
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1007/s11356-019-06539-3
dc.identifier.issn0944-1344
dc.identifier.urihttp://hdl.handle.net/10400.1/14207
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer
dc.subjectRare-earth-elements
dc.subjectIberian Pyrite Belt
dc.subjectPuyango river-basin
dc.subjectPassive treatment
dc.subjectCaustic magnesia
dc.subjectStream waters
dc.subjectMining cctivities
dc.subjectSw
dc.subjectMetals
dc.subjectIron
dc.subjectZaruma-Portovelo mining district
dc.subjectHydro-geochemistry
dc.subjectAMD
dc.subjectWater remediation
dc.subjectMetal removal
dc.subjectSecondary mineral cycles
dc.subjectMine waste revalorization
dc.titleRemediation experiment of Ecuadorian acid mine drainage: geochemical models of dissolved species and secondary minerals saturation
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage34872
oaire.citation.issue34
oaire.citation.startPage34854
oaire.citation.titleEnvironmental Science and Pollution Research
oaire.citation.volume26
person.familyNameDelgado Rodríguez
person.familyNameBoski
person.givenNameJoaquín
person.givenNameTomasz
person.identifier.ciencia-id1416-B317-51D1
person.identifier.orcid0000-0002-6906-5713
person.identifier.orcid0000-0003-2462-4179
person.identifier.ridB-5274-2016
person.identifier.scopus-author-id12766437500
person.identifier.scopus-author-id6602267486
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication5f3ba401-8186-47ca-b28f-a630fabd7551
relation.isAuthorOfPublicationa857b0c7-90ab-473b-a62e-e92b452e604d
relation.isAuthorOfPublication.latestForDiscovery5f3ba401-8186-47ca-b28f-a630fabd7551

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