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  • 1.
    Eivazihollagh, Alireza
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Svanedal, Ida
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Edlund, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Norgren, Magnus
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    On chelating surfactants: Molecular perspectives and application prospects2019In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 278, p. 688-705Article in journal (Refereed)
    Abstract [en]

    Chelating agents, molecules that very strongly coordinates certain metal ions, are used industrially as well as in consumer products to minimize disturbances and increase performance of reactions and applications. The widely used sequestering agents, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) belong to this branch of readily water-soluble compounds. When these chemical structures also have hydrophobic parts, they are prone to adsorb at air-water interfaces and to self-assemble. Such bifunctional molecules can be called chelating surfactants and will have more extended utilization prospects than common chelating agents or ordinary ionic surfactants. The present review attempts to highlight the fundamental behavior of chelating surfactants in solution and at interfaces, and their very specific interactions with metal ions. Methods to recover chelating surfactants from metal chelates are also described. Moreover, utilization of chelating surfactants in applications for metal removal in environmental engineering and mineral processing, as well as for metal control in the fields of biology, chemistry and physics, is exemplified and discussed.

  • 2.
    Ekman, Martin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Sustainable Building Engineering.
    Infiltrationsom ett extrasteg i rening av avloppsvatten2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Avloppsvatten kan innehålla föroreningar och smittoämnen som kan påverka både miljön och människors hälsa negativt. En vanlig metod för att rena avloppsvatten i mellannorrland är med så kallade fällningsdammar. De ger goda resultat med tanke på vattenkvalitet, men kvaliteten kan höjas ytterligare genom ett poleringssteg i form av infiltrationsdammar. I Björnrike finns en anläggning bestående av både fällningsdammar och infiltrationsdammar.

    Syftet med denna rapport är redogöra för den undersökningen jag har gjort på uppdrag från Härjedalens kommun. Undersökningen syftade till att visa effekterna som infiltrationsdammar har på avloppsvatten, vilket först har renats genom fällningsdammar. För att undersöka detta gjordes fältmätningar i Björnrikes anläggning, där vattenprover togs och sedan analyserades.

    Analysresultaten och slutsatserna av dessa visar att infiltrationsdammar fyller sin funktion som poleringssteg vid rening av avloppsvatten. Infiltrationsdammarna hade positiv påverkan på majoriteten av de parametrar som undersöktes, även om påverkan var knappt märkbar i vissa fall.

  • 3.
    Van de Griend, Martijn Johannes
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Sustainable Building Engineering.
    Tandsbyns avloppsreningsverk: Förstudie om effektivisering och åtgärdsprotokoll ur ett BOD perspektiv2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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