Microbially induced corrosion of copper in simulated anoxic groundwater

Research output: Contribution to conferenceConference articleScientificpeer-review

1 Citation (Scopus)

Abstract

Copper has been chosen as the outermost material used in the canister in Finnish nuclear waste disposal program. In anoxic water, the corrosion of copper should be extremely slow. However, microbial activity on the surface of the copper canister or in the vicinity of the canister can enhance corrosion in many different ways, e.g. changing the pH or redox potential, excretion of corrosive
metabolites, direct or indirect reduction or oxidation of corrosion products and formation of biofilms. In this study the later stage of the deep geological nuclear waste repository was simulated. In that stage all oxygen introduced at the construction stage has been consumed and the temperature in the repository has decreased to the level of the surrounding bedrock. It is also assumed that the copper is in direct contact with the groundwater. We studied the microbially influenced corrosion (MIC) of copper sheets in the simulation using
electrochemical technologies, weight loss measurements and molecular biology methods in the laboratory. The chemistry of the used synthetic water was calculated to simulate the groundwater of disposal site also including the effects of bentonite, which will be used as buffer in the repository. Inoculations of sulfate reducing bacteria (SRB) and methanogens enriched from the disposal site were added to the biotic experiments. A sterilized abiotic environment was used as a reference. Preliminary results of the first year´s incubation studies are discussed in this paper.
Original languageEnglish
Number of pages11
Publication statusPublished - 2016
MoE publication typeNot Eligible
Event European Corrosion Congress, Eurocorr 2016 - Montpellier, France
Duration: 11 Sep 201615 Sep 2016

Conference

Conference European Corrosion Congress, Eurocorr 2016
Abbreviated titleEurocorr 2016
CountryFrance
CityMontpellier
Period11/09/1615/09/16

Fingerprint

corrosion
copper
groundwater
repository
radioactive waste
sulfate-reducing bacterium
redox potential
bentonite
excretion
waste disposal
inoculation
microbial activity
biofilm
bedrock
incubation
oxidation
water
oxygen
simulation
experiment

Cite this

Carpén, L., Rajala, P., & Bomberg, M. (2016). Microbially induced corrosion of copper in simulated anoxic groundwater. Paper presented at European Corrosion Congress, Eurocorr 2016, Montpellier, France.
Carpén, Leena ; Rajala, Pauliina ; Bomberg, Malin. / Microbially induced corrosion of copper in simulated anoxic groundwater. Paper presented at European Corrosion Congress, Eurocorr 2016, Montpellier, France.11 p.
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Carpén, L, Rajala, P & Bomberg, M 2016, 'Microbially induced corrosion of copper in simulated anoxic groundwater' Paper presented at European Corrosion Congress, Eurocorr 2016, Montpellier, France, 11/09/16 - 15/09/16, .

Microbially induced corrosion of copper in simulated anoxic groundwater. / Carpén, Leena; Rajala, Pauliina; Bomberg, Malin.

2016. Paper presented at European Corrosion Congress, Eurocorr 2016, Montpellier, France.

Research output: Contribution to conferenceConference articleScientificpeer-review

TY - CONF

T1 - Microbially induced corrosion of copper in simulated anoxic groundwater

AU - Carpén, Leena

AU - Rajala, Pauliina

AU - Bomberg, Malin

PY - 2016

Y1 - 2016

N2 - Copper has been chosen as the outermost material used in the canister in Finnish nuclear waste disposal program. In anoxic water, the corrosion of copper should be extremely slow. However, microbial activity on the surface of the copper canister or in the vicinity of the canister can enhance corrosion in many different ways, e.g. changing the pH or redox potential, excretion of corrosivemetabolites, direct or indirect reduction or oxidation of corrosion products and formation of biofilms. In this study the later stage of the deep geological nuclear waste repository was simulated. In that stage all oxygen introduced at the construction stage has been consumed and the temperature in the repository has decreased to the level of the surrounding bedrock. It is also assumed that the copper is in direct contact with the groundwater. We studied the microbially influenced corrosion (MIC) of copper sheets in the simulation usingelectrochemical technologies, weight loss measurements and molecular biology methods in the laboratory. The chemistry of the used synthetic water was calculated to simulate the groundwater of disposal site also including the effects of bentonite, which will be used as buffer in the repository. Inoculations of sulfate reducing bacteria (SRB) and methanogens enriched from the disposal site were added to the biotic experiments. A sterilized abiotic environment was used as a reference. Preliminary results of the first year´s incubation studies are discussed in this paper.

AB - Copper has been chosen as the outermost material used in the canister in Finnish nuclear waste disposal program. In anoxic water, the corrosion of copper should be extremely slow. However, microbial activity on the surface of the copper canister or in the vicinity of the canister can enhance corrosion in many different ways, e.g. changing the pH or redox potential, excretion of corrosivemetabolites, direct or indirect reduction or oxidation of corrosion products and formation of biofilms. In this study the later stage of the deep geological nuclear waste repository was simulated. In that stage all oxygen introduced at the construction stage has been consumed and the temperature in the repository has decreased to the level of the surrounding bedrock. It is also assumed that the copper is in direct contact with the groundwater. We studied the microbially influenced corrosion (MIC) of copper sheets in the simulation usingelectrochemical technologies, weight loss measurements and molecular biology methods in the laboratory. The chemistry of the used synthetic water was calculated to simulate the groundwater of disposal site also including the effects of bentonite, which will be used as buffer in the repository. Inoculations of sulfate reducing bacteria (SRB) and methanogens enriched from the disposal site were added to the biotic experiments. A sterilized abiotic environment was used as a reference. Preliminary results of the first year´s incubation studies are discussed in this paper.

M3 - Conference article

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Carpén L, Rajala P, Bomberg M. Microbially induced corrosion of copper in simulated anoxic groundwater. 2016. Paper presented at European Corrosion Congress, Eurocorr 2016, Montpellier, France.