Databank

POSIVA Report 1998-9

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Name:

Geomicrobial Investigations of Groundwaters from Olkiluoto, Hästholmen, Kivetty and Romuvaara. Finland

Writer:

Shelley A. Haveman; Karsten Pedersen; Paula Ruotsalainen

Language:

English

Page count:

44

ISBN:

951-652-047-2; 1239-3096

Summary:

Working report: POSIVA Report POSIVA 98-09, 41 pages, English
ISBN 951-652-047-2

Shelley A. Haveman & Karsten Pedersen, Göteborg University
Paula Ruotsalainen, Fintact Oy


GEOMICROBIAL INVESTIGATIONS OF GROUNDWATERS FROM
OLKILUOTO, HÄSTHOLMEN, KIVETTY AND ROMUVAARA, FINLAND


ABSTRACT

Groundwater from four deep hard rock sites being considered for nuclear waste disposal
in Finland (Olkiluoto, Hästholmen, Kivetty and Romuvaara) were investigated for
microbial populations. Bacteria will be present in a waste disposal vault, so it is
important to understand the microbiology of any potential site.

Groundwater samples were collected from 200 to 950 m depth and included fresh,
brackish and saline waters. Samples were collected with a pressurized groundwater
sampler, PAVE, which is an excellent tool for microbiological sampling.

Total cell numbers were typical for deep groundwater, 105 to 106 cells/ml. Growth media
designed using groundwater chemistry data were used for enumeration of methanogens,
acetogens, sulfate reducing bacteria (SRB) and iron reducing bacteria (IRB). Microbial
populations varied between sites. Iron sulfide fracture minerals are common in the
brackish high sulfate groundwaters of Olkiluoto, where SRB predominated. Hästholmen
groundwater has high dissolved iron, iron hydroxide fracture minerals and IRB were the
main microbial population. Kivetty and Romuvaara had mixed populations.

It has been proposed that deep subsurface ecosystems are based on hydrogen and carbon
dioxide which provide energy and carbon to support the food chain. Signs of such an
ecosystem were seen in Olkiluoto. More study is needed to understand the basis for deep
subsurface life.

From a microbiological point of view, all sites investigated are equally suitable for
nuclear waste disposal.


Keywords: acetogenesis, groundwater, hydrogen, iron reduction, methanogenesis,
microbiology, redox, sulfate reduction


POSIVA Report POSIVA 98-09, 41 pages, English
ISBN 951-652-047-2

Shelley A. Haveman & Karsten Pedersen, Göteborg University
Paula Ruotsalainen, Fintact Oy


GEOMICROBIAL INVESTIGATIONS OF GROUNDWATERS FROM
OLKILUOTO, HÄSTHOLMEN, KIVETTY AND ROMUVAARA, FINLAND


ABSTRACT

Groundwater from four deep hard rock sites being considered for nuclear waste disposal
in Finland (Olkiluoto, Hästholmen, Kivetty and Romuvaara) were investigated for
microbial populations. Bacteria will be present in a waste disposal vault, so it is
important to understand the microbiology of any potential site.

Groundwater samples were collected from 200 to 950 m depth and included fresh,
brackish and saline waters. Samples were collected with a pressurized groundwater
sampler, PAVE, which is an excellent tool for microbiological sampling.

Total cell numbers were typical for deep groundwater, 105 to 106 cells/ml. Growth media
designed using groundwater chemistry data were used for enumeration of methanogens,
acetogens, sulfate reducing bacteria (SRB) and iron reducing bacteria (IRB). Microbial
populations varied between sites. Iron sulfide fracture minerals are common in the
brackish high sulfate groundwaters of Olkiluoto, where SRB predominated. Hästholmen
groundwater has high dissolved iron, iron hydroxide fracture minerals and IRB were the
main microbial population. Kivetty and Romuvaara had mixed populations.

It has been proposed that deep subsurface ecosystems are based on hydrogen and carbon
dioxide which provide energy and carbon to support the food chain. Signs of such an
ecosystem were seen in Olkiluoto. More study is needed to understand the basis for deep
subsurface life.

From a microbiological point of view, all sites investigated are equally suitable for
nuclear waste disposal.


Keywords: acetogenesis, groundwater, hydrogen, iron reduction, methanogenesis,
microbiology, redox, sulfate reduction


Keywords:

acetogenesis; ground water; hydrogen; iron reduction; methanogenesis; microbiology; redox; sulfate reduction

File(s):

Geomicrobial Investigations of Groundwaters from Olkiluoto, Hästholmen, Kivetty and Romuvaara. Finland (pdf) (3.1 MB)


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