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KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In Sweden 1.2 million people rely on private wells; 800 000 of these use drilled wells. Elevated concentrations of radionuclides in the drinking water have been a long-term problem in Sweden. The well owners are not aware of the risk of elevated concentrations of radionuclides, nor do they have knowledge concerning if their particular well has elevated concentrations. In the survey initiated in 2001 by the

Swedish Geological Survey (SGU) and Swedish Radiation Safety Authority (SSM) it was discovered that 17 % of the private drilled wells exceeded the Swedish guideline value of uranium; which is 15 μg/l, and 2 % had a uranium concentration beyond 100 μg/l. There are several methods available to reduce the uranium content in drinking water, though many of these methods are based on the charge of the uranium species. Knowing the speciation of uranium will rationalize the treatment for uranium, thus justifies the goal of this study, which is; to model the chemistry of uranium in private drilled wells, using Visual MINTEQ 3.0 and attempt to find a correlation of the bedrock source of water, using ArcGIS 10.0. It was discovered that the U-DOM species predominates in the acidic waters (pH < 7) and Ca-carbonates in the alkaline waters (pH > 7). Hydroxides are also a major species formed; these complexes predominate around pH ≈ 7. It was also affirmed that the physical parameters such as pH, pCO2 and the introduction of DOM, affects the outcome of the model noticeably. The pH value is the only parameter which has a correlation to all the species formed. The other factor acknowledged to influence it is the pCO2 applied. The outcome of the model can be regarded as reliable, and is in agreement with what previous studies has shown. No correlation could be interpreted between the results and the bedrock source nor was any spatial trend observed.

Place, publisher, year, edition, pages
, LWR Degree Project, ISSN 1651-064X ; 12:32
Keyword [en]
Uranium species; Uranium in groundwater; Private drilled wells; Visual MINTEQ
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-109260OAI: diva2:580614
Subject / course
Ground Water Chemistry
Educational program
Degree of Master - Environmental Engineering and Sustainable Infrastructure
Available from: 2013-01-18 Created: 2012-12-23 Last updated: 2013-01-18Bibliographically approved

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