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  • 1.
    Lövberg, Pernilla
    Halmstad University, School of Business and Engineering (SET).
    Tjänligt vatten i kranen - Membranteknik gör det möjligt: En utredning av pilotförsök i Glemmingebro2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nanofiltration is a proper way of preparation of drinking water. The process has a lot in common with reverse osmosis where a semipermeable membrane is used to separate a pure water flow from the remaining water. A pilot plant was used to ensure that nanofiltration is a suitable technology for a specific waterworks station in Glemmingebro, Ystad. The purpose was also to find out if a pH-adjustment is needed for feed water in a possible full scale plant.  In this case nanofiltration is used mainly to remove sulphate and calcium since the raw water contains concentrations of these substances which exceed the limits for potable water. It is important to receive a high recovery (RC), otherwise the deliviery of water won’t be high enough. On the other hand a high RC increases the risk of precipitates, which require more frequent cleaning. An optimal RC has already been calculated, the intention of this survey is to consider whether the theory is consistent with reality or not. Calculations of the highest acceptable pH-value were made in a computer program from Dow, ROSA. The result indicates that nanofiltration is suitable to use in this waterworks station and a pH-adjustment is needed when the pH level of raw water exceeds 7.7.

  • 2.
    Waara, Sylvia
    et al.
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Waara, Karl-Otto
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Forsberg, Åke
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Fridolfsson, Magnus
    Tekniska förvaltningen, Örebro Kommun, Atleverket, Örebro, Sweden.
    Performance of a Constructed Wetland System for Treatment of Landfill Leachate2008In: Proceedings Waste 2008: Waste and Resource Management – a Shared Responsibility / [ed] Marie Townshend, Stanton-on-the-Wolds: Waste Conference Ltd. , 2008, p. 655-667Conference paper (Refereed)
    Abstract [en]

    The performance of a constructed wetland for treatment of landfill leachate has been evaluated based upon data obtained during 4 years (2003-2006). It consists of a series of 10 ponds with a total capacity of 52.000 m3 covering 8 ha. Using univariate and multivariate statistics (PCA) the reduction pattern of a large number of chemical parameters including heavy metals has been investigated in 3 parts of the wetland with equal volume. Analyses show that many parameters are removed to the greatest extent in the first part of the system (e.g. many heavy metals, total suspended solids) or the second part of the system (N-NH4) while other parameters such as total nitrogen are more gradually reduced (10 ton/year removed).  Toxicity testing with 5 bioassays showed that toxicity was sometimes observed at the inlet but no toxicity was observed at the outlet for 4 of the test species. The data presented will be used for optimizing the treatment process as well as to improve the monitoring program.

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