Selective removal of chlorinated organic compounds from soil flushing emulsions: Adsorbent regeneration with thermal-activated persulfate and surfactant recovery

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dc.contributor.authorSánchez Yepes, Andrés
dc.contributor.authorSantos López, Aurora
dc.contributor.authorRomero Salvador, Arturo
dc.contributor.authorLorenzo Fernández, David
dc.date.accessioned2024-06-20T11:54:06Z
dc.date.available2024-06-20T11:54:06Z
dc.date.issued0202
dc.description2023 Acuerdo transformativo financiado por la CRUE
dc.description.abstractHydrophobic organic compounds (HOCs) released into the environment can form nonaqueous phase liquids, contaminating soil and groundwater. Surfactant-enhanced aquifer remediation, followed by extracting a highly contaminated emulsion comprising surfactants and contaminants, is a promising technology for remediating polluted sites. However, the sustainable treatment of the emulsion is crucial. This study presents a two-step method for treating emulsions containing HOCs and surfactants. Firstly, pollutants are selectively adsorbed onto granular activated carbon (GAC) in a column. Secondly, spent GAC is regenerated by oxidizing adsorbed pollutants using persulfate activated at 60 ◦C. The emulsion was obtained from surfactant-enhanced aquifer remediation at a polluted site with lindane production waste, consisting of E-Mulse® 3 surfactant (12 g L− 1 ) and 28 chlorinated organic compounds (COCs) at a concentration of 9.1 gCOCs L− 1 . Selective adsorption of COCs was observed since the adsorption kinetic constant was much higher than the E3, being 31.60 and 1.76 gGAC− W⋅mg− 1 j ⋅ h− 1 respectively. The adsorption-regeneration cycle was repeated three times. It was found that the GAC adsorbed 90 mgCOCs⋅gGAC − 1 were constant after four cycles (70 % of the COCs adsorption capacity in the first step). The surfactant adsorption decreased by approximately 80 % from 108 to 26 mgE3 gGAC − 1 after the third cycle, enabling surfactant recovery from the emulsion. In addition, the remaining amount of persulfate increased from 24 to 39 %, reducing oxidant consumption. Finally, the water effluent obtained after regeneration showed reduced toxicity due to the generation of nontoxic by-products, such as short-chain acids and sulphates. The results obtained proved the GAC-based adsorption/regeneration process was effective and stable over multiple cycles.
dc.description.departmentDepto. de Ingeniería Química y de Materiales
dc.description.facultyFac. de Ciencias Químicas
dc.description.fundingtypeAPC financiada por la UCM
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (España)
dc.description.sponsorshipMinisterio de Ciencia e Innovación (España)
dc.description.sponsorshipEuropean Commission
dc.description.statuspub
dc.identifier.citationReferences 1. Sánchez-Yepes, A.; Santos, A.; Romero, A.; Lorenzo, D. Selective removal of chlorinated organic compounds from soil flushing emulsions: Adsorbent regeneration with thermal-activated persulfate and surfactant recovery. Journal of Water Process Engineering 2024, 57, 104644 DOI:10.1016/j.jwpe.2023.104644.
dc.identifier.doi10.1016/j.jwpe.2023.104644
dc.identifier.issn2214-7144
dc.identifier.officialurl10.1016/j.jwpe.2023.104644
dc.identifier.relatedurlhttps://www.sciencedirect.com/science/article/pii/S2214714423011649
dc.identifier.urihttps://hdl.handle.net/20.500.14352/105136
dc.journal.titleJournal of Water Process Engineering
dc.language.isoeng
dc.page.initial104644
dc.publisherElsevier
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/PID2022-137828OB-I00
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/PDC2022-133095-I00
dc.relation.projectIDinfo:eu-repo/grantAgreement/MICINN/PRE2020-093195
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/LIFE17/ENV/ES/000260
dc.rightsAttribution 4.0 Internationalen
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.cdu66.0
dc.subject.keywordAdsorption and regeneration cycles Chlorinated organic compound Persulfate activated by temperature
dc.subject.keywordSurfactant
dc.subject.keywordEmulsion
dc.subject.keywordChlorinated organic compound
dc.subject.keywordPersulfate activated by temperature
dc.subject.ucmIngeniería química
dc.subject.unesco3303 Ingeniería y Tecnología Químicas
dc.titleSelective removal of chlorinated organic compounds from soil flushing emulsions: Adsorbent regeneration with thermal-activated persulfate and surfactant recovery
dc.typejournal article
dc.type.hasVersionVoR
dc.volume.number57
dspace.entity.typePublication
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relation.isAuthorOfPublication.latestForDiscovery68af935f-2da3-46e3-8e2d-a33ea1919bd6
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