Cristin-resultat-ID: 2004937
Sist endret: 25. april 2022, 08:46
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

The effects of soil organic matter on leaching of hexavalent chromium from concrete waste: Batch and column experiments

Bidragsytere:
  • Cathrine Eckbo
  • Gudny Okkenhaug og
  • Sarah Hale

Tidsskrift

Journal of Environmental Management
ISSN 0301-4797
e-ISSN 1095-8630
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Volum: 309
Artikkelnummer: 114708
Open Access

Importkilder

Scopus-ID: 2-s2.0-85124547686

Beskrivelse Beskrivelse

Tittel

The effects of soil organic matter on leaching of hexavalent chromium from concrete waste: Batch and column experiments

Sammendrag

Concrete is one of the most common building materials in the world and in accordance with the world’s shift to a circular economy, there is a need of an increase in concrete reuse and recycling. One of the environmental concerns linked to concrete recycling is the leaching and spread of hexavalent chromium (Cr(VI)). In the present study the Cr(VI) leaching from crushed concrete waste and the effects of soil organic matter (SOM) on chromium (Cr) speciation has been investigated in realistic reuse scenarios by the means of batch shale tests and layered column tests. The effects of concrete properties (pH, grain size and age) on Cr(VI) leaching was also studied. Cr leaching from concrete alone is mainly in the form of Cr(VI), with the pH of the leachate being >10. The smaller the grainsize of the concrete, the higher the Cr(VI) concentration is in the leachate. There was no correlation between the age of the concrete and concrete leaching. When exposed to SOM the Total-Cr concentration in the leachate was reduced. The reduction increased with higher TOC level, with a 99% reduction at very high TOC (25%). The results indicate that Cr(VI) leaching from recycled concrete waste can be mitigated by exposing it to SOM in the desired recycling scenario.

Bidragsytere

Cathrine Eckbo

  • Tilknyttet:
    Forfatter
    ved Miljøvitenskap og naturforvaltning ved Norges miljø- og biovitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Bærekraftige geoløsninger ved Norges Geotekniske Institutt

Gudny Okkenhaug

  • Tilknyttet:
    Forfatter
    ved Miljøgeoteknikk ved Norges Geotekniske Institutt
  • Tilknyttet:
    Forfatter
    ved Miljøvitenskap og naturforvaltning ved Norges miljø- og biovitenskapelige universitet

Sarah Hale

  • Tilknyttet:
    Forfatter
    ved Bærekraftige geoløsninger ved Norges Geotekniske Institutt
1 - 3 av 3