Optimizing NOM Removal: Impact of Calcium Chloride

Alfredo Gonzalez-Perez, Kristofer Hägg and Fabrice Duteil
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Alfredo Gonzalez-Perez: Department of Materials Science and Applied Mathematics, Faculty of Technology and Society, Malmö University, Nordenskiöldsgatan 1, 211 19 Malmö, Sweden
Kristofer Hägg: Department of Building and Environmental Technology, Lund University, John Ericssons Väg 1, Box 118, 221 00 Lund, Sweden
Fabrice Duteil: TETRA Chemicals Europe AB, P.O. Box 901, 251 09 Helsingborg, Sweden

Sustainability, 2021, vol. 13, issue 11, 1-10

Abstract: 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 (CaCl 2 ) as a co-coagulant in Al 3+ and Fe 3+ assisted coagulation, flocculation and sedimentation processes for NOM-removal from raw water collected from Lake Bolmen, in southern Sweden. Jar tests were conducted at Ringsjö Water Works (WW), a surface water treatment plant (WTP), to investigate the potential reduction in primary coagulants aluminum sulphate (Al 2 (SO 4 ) 3 ) and ferric chloride (FeCl 3 ). This work shows that CaCl 2 can, in certain situations, reduce the need for primary coagulants, which would reduce the environmental impact and costs associated with primary coagulant consumption.

Keywords: NOM; coagulation; flocculation; Lake Bolmen; aluminum sulphate; ferric chloride; calcium chloride; raw water (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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