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  • 1.
    Gonzalez-Perez, Alfredo
    et al.
    Malmö University, Faculty of Technology and Society (TS), Department of Computer Science and Media Technology (DVMT). Vatteninfo Sverige AB.
    Hagg, Kristofer
    Lund University; Sweden Water Research AB.
    Duteil, Fabrice
    TETRA Chemicals Europe AB.
    Optimizing NOM Removal: Impact of Calcium Chloride2021In: Sustainability, E-ISSN 2071-1050, Vol. 13, no 11, article id 6338Article in journal (Refereed)
    Abstract [en]

    Understanding the character of natural organic matter (NOM) and assessing its impact on water quality is paramount for managers of catchments and water utilities. For drinking-water producers, NOM affects disinfectant demand and the formation of by-products which can have adverse health effects. NOM content in raw waters also has an impact on water treatment processes by increasing required coagulant dosages, reducing the effectiveness of adsorption processes and fouling membrane systems. This study investigated the effects of calcium chloride (CaCl2) as a co-coagulant in Al3+ and Fe3+ assisted coagulation, flocculation and sedimentation processes for NOM-removal from raw water collected from Lake Bolmen, in southern Sweden. Jar tests were conducted at Ringsjo Water Works (WW), a surface water treatment plant (WTP), to investigate the potential reduction in primary coagulants aluminum sulphate (Al-2(SO4)(3)) and ferric chloride (FeCl3). This work shows that CaCl2 can, in certain situations, reduce the need for primary coagulants, which would reduce the environmental impact and costs associated with primary coagulant consumption.

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