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  • 1.
    Bergman, Anders
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.
    Lindgren, Samuel
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.
    Brunifiering av Öjaren: Analys och framtida utsikter2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The colouring of water in many lakes across the Northern hemisphere is increasing. This is also the case in Lake Öjaren in Sandviken municipality in Sweden. The lake is the main water source in Sandviken and has a high and increasing watercolour. This leads to more complex cleaning methods and higher costs for the society. This study focuses on the changing and increasing watercolour in the lake over a period from 1995-2015. The factors analysed in this study are those who is considered to have an effect on the watercolour in the lake.

    The reasons for increased brownification are different depending on which type of water body is studied. Climate, soil conditions and pollutants contributes in varying extent to brownification. Increased levels in dissolved organic carbon (DOC) and iron are common reasons for brownification in Lake Öjaren and other water bodies, in Lake Öjaren increased levels of manganese are also shown to affect brownification.

    The aim of the study is to evaluate the correlation between the watercolour and the factors: iron, pH, COD, manganese, temperature and precipitation. The aim is also to investigate which actions are possible to apply to prevent increased watercolour.

    Water samples from Lake Öjaren between the years 1995-2015 have been the basis for the executed statistical analysis. Evaluating the correlation between the factors we have used Minitab 17 and calculated Pearson´s correlation coefficient. To further explain the relationship between the factors a principal component analysis (PCA) has been performed. Future scenarios and current trends have also been produced, in order to develop a better foundation for further studies.

    The correlation analysis reveals that the most significant connection with watercolour are iron, COD and manganese. The result of the PCA also corroborates this connection where three factors are the ones that are most co-variating.

    The trend and the future scenario for all the factors in Lake Öjaren are that they all are increasing and the watercolour is expected to be increasing by 63 % until year 2050. This scenario means that actions are needed to counteract the increasing colouring of the water.

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