Co-remediation of hexavalent chromium and arsenic polluted groundwater using crab processing waste products

Helen Keenan, Keith Torrance

Research output: Contribution to conferencePaper

Abstract

Groundwater samples containing elevated concentrations of Cr(VI) and As(III) were collected from boreholes in the Glasgow area that were known to contain waste in-fill from chromite ore processing (COPR). As Cr(VI)pollution is usually addressed by chemical reduction to the less mobile and toxic Cr(III) species, there is concern whether this will cause other contaminants such as arsenic to become mobile from the reduction of the less-mobile As (V) to the more toxic As (III).
Chromium speciation was determined using ICP-MS and colourimetry, then compared to analysis after laboratory-scale remediation by passing samples through columns containing mixtures of sorbants, including crab processing waste, chitosan and zero-valent iron under different redox conditions. Arsenic speciation was determined by IC-ICP-MS and anodic stripping voltammetry and monitored for each experiment. Results are presented on the effectiveness of different sorbants to reduce the mobility of Cr(VI) as an alternative to chemical reduction, and rated on consequential arsenic mobility.


LanguageEnglish
Publication statusUnpublished - 1 Jul 2010
EventSEGH 2010 - Galway, Ireland
Duration: 28 Jun 20103 Jul 2010

Conference

ConferenceSEGH 2010
CountryIreland
CityGalway
Period28/06/103/07/10

Fingerprint

Arsenic
Remediation
Groundwater
Poisons
Processing
Chromite
Ore treatment
Chitosan
Chromium
Voltammetry
Boreholes
Pollution
Iron
Impurities
chromium hexavalent ion
Experiments

Keywords

  • arsenic
  • speciation
  • chromium
  • co-remediation

Cite this

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title = "Co-remediation of hexavalent chromium and arsenic polluted groundwater using crab processing waste products",
abstract = "Groundwater samples containing elevated concentrations of Cr(VI) and As(III) were collected from boreholes in the Glasgow area that were known to contain waste in-fill from chromite ore processing (COPR). As Cr(VI)pollution is usually addressed by chemical reduction to the less mobile and toxic Cr(III) species, there is concern whether this will cause other contaminants such as arsenic to become mobile from the reduction of the less-mobile As (V) to the more toxic As (III). Chromium speciation was determined using ICP-MS and colourimetry, then compared to analysis after laboratory-scale remediation by passing samples through columns containing mixtures of sorbants, including crab processing waste, chitosan and zero-valent iron under different redox conditions. Arsenic speciation was determined by IC-ICP-MS and anodic stripping voltammetry and monitored for each experiment. Results are presented on the effectiveness of different sorbants to reduce the mobility of Cr(VI) as an alternative to chemical reduction, and rated on consequential arsenic mobility.",
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author = "Helen Keenan and Keith Torrance",
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Keenan, H & Torrance, K 2010, 'Co-remediation of hexavalent chromium and arsenic polluted groundwater using crab processing waste products' Paper presented at SEGH 2010, Galway, Ireland, 28/06/10 - 3/07/10, .

Co-remediation of hexavalent chromium and arsenic polluted groundwater using crab processing waste products. / Keenan, Helen; Torrance, Keith.

2010. Paper presented at SEGH 2010, Galway, Ireland.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Co-remediation of hexavalent chromium and arsenic polluted groundwater using crab processing waste products

AU - Keenan, Helen

AU - Torrance, Keith

PY - 2010/7/1

Y1 - 2010/7/1

N2 - Groundwater samples containing elevated concentrations of Cr(VI) and As(III) were collected from boreholes in the Glasgow area that were known to contain waste in-fill from chromite ore processing (COPR). As Cr(VI)pollution is usually addressed by chemical reduction to the less mobile and toxic Cr(III) species, there is concern whether this will cause other contaminants such as arsenic to become mobile from the reduction of the less-mobile As (V) to the more toxic As (III). Chromium speciation was determined using ICP-MS and colourimetry, then compared to analysis after laboratory-scale remediation by passing samples through columns containing mixtures of sorbants, including crab processing waste, chitosan and zero-valent iron under different redox conditions. Arsenic speciation was determined by IC-ICP-MS and anodic stripping voltammetry and monitored for each experiment. Results are presented on the effectiveness of different sorbants to reduce the mobility of Cr(VI) as an alternative to chemical reduction, and rated on consequential arsenic mobility.

AB - Groundwater samples containing elevated concentrations of Cr(VI) and As(III) were collected from boreholes in the Glasgow area that were known to contain waste in-fill from chromite ore processing (COPR). As Cr(VI)pollution is usually addressed by chemical reduction to the less mobile and toxic Cr(III) species, there is concern whether this will cause other contaminants such as arsenic to become mobile from the reduction of the less-mobile As (V) to the more toxic As (III). Chromium speciation was determined using ICP-MS and colourimetry, then compared to analysis after laboratory-scale remediation by passing samples through columns containing mixtures of sorbants, including crab processing waste, chitosan and zero-valent iron under different redox conditions. Arsenic speciation was determined by IC-ICP-MS and anodic stripping voltammetry and monitored for each experiment. Results are presented on the effectiveness of different sorbants to reduce the mobility of Cr(VI) as an alternative to chemical reduction, and rated on consequential arsenic mobility.

KW - arsenic

KW - speciation

KW - chromium

KW - co-remediation

UR - http://www.nuigalway.ie/segh2010/

M3 - Paper

ER -