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Removal of metals and hydrocarbons from stormwater using coagulation and flocculation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-3580-8715
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-0520-796x
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-9541-3542
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2020 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 182, article id 115919Article in journal (Refereed) Published
Abstract [en]

As the understanding of how stormwater pollutants are fractioned and need for mitigation has increased, so has the investigation into more advanced treatment techniques. The present study investigated the treatment efficiency of coagulation/flocculation and sedimentation in semi-synthetic stormwater. Five coagulants were evaluated in terms of reducing particle content, organic carbon, total and dissolved metals, hydrocarbon oil index, and polycyclic aromatic hydrocarbons (PAHs). Changes in the resulting particle size distribution as a consequence of the coagulation treatment were also investigated. The pollutants in the semi-synthetic stormwater were predominantly in the particulate phase. The medium and longer chained hydrocarbons dominated the hydrocarbon oil index, while medium to high molecular weight PAHs were most abundant. Iron chloride was the only coagulant that affected particle size distribution post-treatment, shifting the distribution toward larger particles. In terms of total metal removal, the performance of the coagulants was similar, with over 90% removal on average. Concentration of zdissolved copper, one of the metals found in the dissolved phase, was reduced by 40% via coagulation treatment. The iron chloride coagulant increased dissolved Zn, a change attributed to a considerable drop in pH resulting in higher ion mobility. Similarly, the reduction in organic content (total organic carbon, oil, and PAHs) was over 90% for most coagulants.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 182, article id 115919
Keywords [en]
Stormwater treatment, Coagulation/flocculation, Pollutant removal, Metals, Hydrocarbons, Treatment efficiency
National Category
Water Engineering
Research subject
Urban Water Engineering; Centre - Centre for Stormwater Management (DRIZZLE)
Identifiers
URN: urn:nbn:se:ltu:diva-78988DOI: 10.1016/j.watres.2020.115919ISI: 000569155800006PubMedID: 32622122Scopus ID: 2-s2.0-85087137505OAI: oai:DiVA.org:ltu-78988DiVA, id: diva2:1432092
Note

Validerad;2020;Nivå 2;2020-07-03 (alebob)

Available from: 2020-05-26 Created: 2020-05-26 Last updated: 2023-09-05Bibliographically approved

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Nyström, FredrikNordqvist, KerstinHerrmann, IngaHedström, AnnelieViklander, Maria

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