Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.1430
DC FieldValueLanguage
dc.contributor.authorGröhlich, Anna-
dc.contributor.authorLanger, Margarethe-
dc.contributor.authorMitrakas, Manassis-
dc.contributor.authorZouboulis, Anastasios I.-
dc.contributor.authorKatsoyiannis, Ioannis A.-
dc.contributor.authorErnst, Mathias-
dc.date.accessioned2017-10-04T12:10:06Z-
dc.date.available2017-10-04T12:10:06Z-
dc.date.issued2017-06-01-
dc.identifierdoi: 10.3390/w9060389-
dc.identifier.citationWater 9 (2017), 6: 389de_DE
dc.identifier.issn2073-4441de_DE
dc.identifier.urihttp://tubdok.tub.tuhh.de/handle/11420/1433-
dc.description.abstractDue to its toxicity, Cr(VI) is undesirable in groundwater. Its chemical reduction to Cr(III) species, followed by precipitation is the most widely practiced treatment technique for the removal of Cr(VI) from polluted waters. The resulting Cr(III) species present low solubility, is much less toxic, and can be subsequently removed either by precipitation, or by adsorption onto iron oxy-hydroxides and co-precipitation. The effects of several parameters, such as the pH value of water to be treated, the applied Fe(II) dose, and the presence of appropriate mineral surfaces, are well investigated and understood. However, the impact of the presence of humic acids (HAs) in this process has only been considered by rather few studies. The main aim of this study was to determine the effect of humic substances on Fe(II) reductive precipitation of Cr(VI) within a pH range relevant for drinking water treatment. Jar test experiments were performed, using artificial groundwater of defined composition and initial Cr(VI) concentration 100 μg/L, ferrous sulphate dosages 0.25–2 mg Fe(II)/L, and pH values 6.5–8. It was found that Cr(VI) and total chromium (Cr(total)) can be reliably removed in the absence of HAs in the tested pH range with the addition of Fe(II) dosage of 1 mg Fe(II)/L. Further on, the results indicated that the reduction of Cr(VI) is only slightly affected by the presence of HAs. However, increased residual total Cr concentrations were found at lower Fe(II) dosages and/or higher pH values. Additionally, the removal of the Cr(III) species formed during Cr(VI) reduction was strongly inhibited by the presence of HAs under the examined experimental conditions, since residual concentrations higher than 60 μg/L were determined. The results of this study will have implications to the ongoing discussion of a new, stricter, European Union regulation limit, regarding the presence of total chromium in drinking water.-
dc.description.abstractDue to its toxicity, Cr(VI) is undesirable in groundwater. Its chemical reduction to Cr(III) species, followed by precipitation is the most widely practiced treatment technique for the removal of Cr(VI) from polluted waters. The resulting Cr(III) species present low solubility, is much less toxic, and can be subsequently removed either by precipitation, or by adsorption onto iron oxy-hydroxides and co-precipitation. The effects of several parameters, such as the pH value of water to be treated, the applied Fe(II) dose, and the presence of appropriate mineral surfaces, are well investigated and understood. However, the impact of the presence of humic acids (HAs) in this process has only been considered by rather few studies. The main aim of this study was to determine the effect of humic substances on Fe(II) reductive precipitation of Cr(VI) within a pH range relevant for drinking water treatment. Jar test experiments were performed, using artificial groundwater of defined composition and initial Cr(VI) concentration 100 μg/L, ferrous sulphate dosages 0.25–2 mg Fe(II)/L, and pH values 6.5–8. It was found that Cr(VI) and total chromium (Cr(total)) can be reliably removed in the absence of HAs in the tested pH range with the addition of Fe(II) dosage of 1 mg Fe(II)/L. Further on, the results indicated that the reduction of Cr(VI) is only slightly affected by the presence of HAs. However, increased residual total Cr concentrations were found at lower Fe(II) dosages and/or higher pH values. Additionally, the removal of the Cr(III) species formed during Cr(VI) reduction was strongly inhibited by the presence of HAs under the examined experimental conditions, since residual concentrations higher than 60 μg/L were determined. The results of this study will have implications to the ongoing discussion of a new, stricter, European Union regulation limit, regarding the presence of total chromium in drinking water.en
dc.language.isoende_DE
dc.publisherMultidisciplinary Digital Publishing Institutede_DE
dc.relation.ispartofWaterde_DE
dc.rightsCC BY 4.0de_DE
dc.rightsinfo:eu-repo/semantics/openAccess-
dc.subjectCr(VI) removalde_DE
dc.subjectFe(II) dosede_DE
dc.subjectCr(total)de_DE
dc.subjecthumic acidsde_DE
dc.subjectgroundwaterde_DE
dc.subject.ddc620: Ingenieurwissenschaftende_DE
dc.titleEffect of organic matter on Cr(VI) removal from groundwaters by Fe(II) reductive precipitation for groundwater treatmentde_DE
dc.typeArticlede_DE
dc.date.updated2017-08-24T09:55:16Z-
dc.identifier.urnurn:nbn:de:gbv:830-882w02284-
dc.identifier.doi10.15480/882.1430-
dc.type.diniarticle-
dc.subject.ddccode620-
dcterms.DCMITypeText-
tuhh.identifier.urnurn:nbn:de:gbv:830-882w02284de_DE
tuhh.gvk.ppn898747988-
tuhh.oai.showtrue-
dc.identifier.hdl11420/1433-
tuhh.abstract.englishDue to its toxicity, Cr(VI) is undesirable in groundwater. Its chemical reduction to Cr(III) species, followed by precipitation is the most widely practiced treatment technique for the removal of Cr(VI) from polluted waters. The resulting Cr(III) species present low solubility, is much less toxic, and can be subsequently removed either by precipitation, or by adsorption onto iron oxy-hydroxides and co-precipitation. The effects of several parameters, such as the pH value of water to be treated, the applied Fe(II) dose, and the presence of appropriate mineral surfaces, are well investigated and understood. However, the impact of the presence of humic acids (HAs) in this process has only been considered by rather few studies. The main aim of this study was to determine the effect of humic substances on Fe(II) reductive precipitation of Cr(VI) within a pH range relevant for drinking water treatment. Jar test experiments were performed, using artificial groundwater of defined composition and initial Cr(VI) concentration 100 μg/L, ferrous sulphate dosages 0.25–2 mg Fe(II)/L, and pH values 6.5–8. It was found that Cr(VI) and total chromium (Cr(total)) can be reliably removed in the absence of HAs in the tested pH range with the addition of Fe(II) dosage of 1 mg Fe(II)/L. Further on, the results indicated that the reduction of Cr(VI) is only slightly affected by the presence of HAs. However, increased residual total Cr concentrations were found at lower Fe(II) dosages and/or higher pH values. Additionally, the removal of the Cr(III) species formed during Cr(VI) reduction was strongly inhibited by the presence of HAs under the examined experimental conditions, since residual concentrations higher than 60 μg/L were determined. The results of this study will have implications to the ongoing discussion of a new, stricter, European Union regulation limit, regarding the presence of total chromium in drinking water.de_DE
tuhh.relation.ispartofWaterde
tuhh.publisher.doi10.3390/w9060389-
tuhh.publication.instituteWasserressourcen und Wasserversorgung B-11de_DE
tuhh.identifier.doi10.15480/882.1430-
tuhh.type.opus(wissenschaftlicher) Artikelde
tuhh.institute.germanWasserressourcen und Wasserversorgung B-11de
tuhh.institute.englishWasserressourcen und Wasserversorgung B-11de_DE
tuhh.gvk.hasppnfalse-
tuhh.hasurnfalse-
openaire.rightsinfo:eu-repo/semantics/openAccessde_DE
dc.type.driverarticle-
dc.rights.ccbyde_DE
dc.rights.ccversion4.0de_DE
dc.type.casraiJournal Articleen
dc.rights.nationallicensefalsede_DE
item.fulltextWith Fulltext-
item.creatorOrcidGröhlich, Anna-
item.creatorOrcidLanger, Margarethe-
item.creatorOrcidMitrakas, Manassis-
item.creatorOrcidZouboulis, Anastasios I.-
item.creatorOrcidKatsoyiannis, Ioannis A.-
item.creatorOrcidErnst, Mathias-
item.grantfulltextopen-
item.languageiso639-1other-
item.creatorGNDGröhlich, Anna-
item.creatorGNDLanger, Margarethe-
item.creatorGNDMitrakas, Manassis-
item.creatorGNDZouboulis, Anastasios I.-
item.creatorGNDKatsoyiannis, Ioannis A.-
item.creatorGNDErnst, Mathias-
crisitem.author.deptWasserressourcen und Wasserversorgung B-11-
crisitem.author.orcid0000-0001-8465-1174-
crisitem.author.orcid0000-0001-9282-6683-
crisitem.author.parentorgStudiendekanat Bauwesen-
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