Decommissionable concrete? Adsorption of radionuclides by removable bio-mineralised hydroxyapatite layers

Research output: Contribution to conferencePoster

Abstract

Decomissioning of concrete infrastructure at nuclear sites after years of use can be problematic and dangerous due to high levels of radioactivity, penetration of contamination into concrete and potentially large volumes of contaminated material. The depth of contamination within concrete ranges from mm to cm and contain many radioactive isotopes types such as C, U, Pu, Sr and Cs. Before decommissioning, concrete structures must be surface decontaminated to minimize waste volumes and reduce hazard. Techniques normally applied involve mechanical scabbing/scraping and high pressure blasting of concrete to remove layers of contamination. These techniques are expensive, unsafe for workers, and risk the spread of radioactive contamination. In addressing the above issues, this project aims to develop a novel decommissionable concrete tailored for safe, rapid decommissioning with minimal waste. Previous work in our group has shown that under certain conditions, bacteria can make bio-mineralized hydroxyapatite (HAp) which form layers as surfaces on cement [1]. The Ca from the HAp can substitute for other cations and we hypothesize that this mechanism would be relevant for radioactive isotopes such as Sr2+ and Cs+ and UO22+, by bonding to PO43-. These HAp layers can be engineered for easy removal at the end of life.
Our poster presents promising results of the first stage in developing the adsorptive layer of hydroxyapatite (HAp) and show its powerful adsorptive properties for ions such as Sr2+ and Cs+ with promise for UO22+.

Conference

ConferenceGoldschmidt2019
CountrySpain
CityBarcelona
Period18/08/1923/08/19
Internet address

Fingerprint

Hydroxyapatite
Radioisotopes
Concretes
Adsorption
Contamination
Bone cement
Forms (concrete)
Radioactivity
Blasting
Concrete construction
Hazards
Bacteria
Positive ions
Ions

Keywords

  • concrete infrastructure
  • nuclear sites
  • radioactivity
  • decontamination
  • decommissionable concrete

Cite this

@conference{00397ce6946f4c8d8a13e70cc4e8ad30,
title = "Decommissionable concrete? Adsorption of radionuclides by removable bio-mineralised hydroxyapatite layers",
abstract = "Decomissioning of concrete infrastructure at nuclear sites after years of use can be problematic and dangerous due to high levels of radioactivity, penetration of contamination into concrete and potentially large volumes of contaminated material. The depth of contamination within concrete ranges from mm to cm and contain many radioactive isotopes types such as C, U, Pu, Sr and Cs. Before decommissioning, concrete structures must be surface decontaminated to minimize waste volumes and reduce hazard. Techniques normally applied involve mechanical scabbing/scraping and high pressure blasting of concrete to remove layers of contamination. These techniques are expensive, unsafe for workers, and risk the spread of radioactive contamination. In addressing the above issues, this project aims to develop a novel decommissionable concrete tailored for safe, rapid decommissioning with minimal waste. Previous work in our group has shown that under certain conditions, bacteria can make bio-mineralized hydroxyapatite (HAp) which form layers as surfaces on cement [1]. The Ca from the HAp can substitute for other cations and we hypothesize that this mechanism would be relevant for radioactive isotopes such as Sr2+ and Cs+ and UO22+, by bonding to PO43-. These HAp layers can be engineered for easy removal at the end of life.Our poster presents promising results of the first stage in developing the adsorptive layer of hydroxyapatite (HAp) and show its powerful adsorptive properties for ions such as Sr2+ and Cs+ with promise for UO22+.",
keywords = "concrete infrastructure, nuclear sites, radioactivity, decontamination, decommissionable concrete",
author = "Susan Cumberland and Renshaw, {Joanna C.} and Turner, {Ronald J.} and Lunn, {Rebecca J.} and Andrea Hamilton",
year = "2019",
month = "8",
day = "21",
language = "English",
note = "Goldschmidt2019 : Geochemical Society Meeting ; Conference date: 18-08-2019 Through 23-08-2019",
url = "https://goldschmidt.info/2019/index",

}

TY - CONF

T1 - Decommissionable concrete? Adsorption of radionuclides by removable bio-mineralised hydroxyapatite layers

AU - Cumberland, Susan

AU - Renshaw, Joanna C.

AU - Turner, Ronald J.

AU - Lunn, Rebecca J.

AU - Hamilton, Andrea

PY - 2019/8/21

Y1 - 2019/8/21

N2 - Decomissioning of concrete infrastructure at nuclear sites after years of use can be problematic and dangerous due to high levels of radioactivity, penetration of contamination into concrete and potentially large volumes of contaminated material. The depth of contamination within concrete ranges from mm to cm and contain many radioactive isotopes types such as C, U, Pu, Sr and Cs. Before decommissioning, concrete structures must be surface decontaminated to minimize waste volumes and reduce hazard. Techniques normally applied involve mechanical scabbing/scraping and high pressure blasting of concrete to remove layers of contamination. These techniques are expensive, unsafe for workers, and risk the spread of radioactive contamination. In addressing the above issues, this project aims to develop a novel decommissionable concrete tailored for safe, rapid decommissioning with minimal waste. Previous work in our group has shown that under certain conditions, bacteria can make bio-mineralized hydroxyapatite (HAp) which form layers as surfaces on cement [1]. The Ca from the HAp can substitute for other cations and we hypothesize that this mechanism would be relevant for radioactive isotopes such as Sr2+ and Cs+ and UO22+, by bonding to PO43-. These HAp layers can be engineered for easy removal at the end of life.Our poster presents promising results of the first stage in developing the adsorptive layer of hydroxyapatite (HAp) and show its powerful adsorptive properties for ions such as Sr2+ and Cs+ with promise for UO22+.

AB - Decomissioning of concrete infrastructure at nuclear sites after years of use can be problematic and dangerous due to high levels of radioactivity, penetration of contamination into concrete and potentially large volumes of contaminated material. The depth of contamination within concrete ranges from mm to cm and contain many radioactive isotopes types such as C, U, Pu, Sr and Cs. Before decommissioning, concrete structures must be surface decontaminated to minimize waste volumes and reduce hazard. Techniques normally applied involve mechanical scabbing/scraping and high pressure blasting of concrete to remove layers of contamination. These techniques are expensive, unsafe for workers, and risk the spread of radioactive contamination. In addressing the above issues, this project aims to develop a novel decommissionable concrete tailored for safe, rapid decommissioning with minimal waste. Previous work in our group has shown that under certain conditions, bacteria can make bio-mineralized hydroxyapatite (HAp) which form layers as surfaces on cement [1]. The Ca from the HAp can substitute for other cations and we hypothesize that this mechanism would be relevant for radioactive isotopes such as Sr2+ and Cs+ and UO22+, by bonding to PO43-. These HAp layers can be engineered for easy removal at the end of life.Our poster presents promising results of the first stage in developing the adsorptive layer of hydroxyapatite (HAp) and show its powerful adsorptive properties for ions such as Sr2+ and Cs+ with promise for UO22+.

KW - concrete infrastructure

KW - nuclear sites

KW - radioactivity

KW - decontamination

KW - decommissionable concrete

M3 - Poster

ER -