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Fredrik Nyström
Fredrik Nyström

Fredrik Nyström

PhD Student
Luleå University of Technology
Urban Water Engineering
Architecture and Water
Department of Civil, Environmental and Natural Resources Engineering
fredrik.nystrom@associated.ltu.se
+46 (0)920 493538
T3015 Lulea

The main research focus of Fredriks PhD project include advanced treatment components for polluted stormwater. Coagulation/flocculation has been the primary focus so far.

Stormwater treatment is conventionally based on sedimentation processes to remove particulate matter in order to improve the water quality. However, recent research has shown that that the smaller particle fractions, that are less efficiently removed by sedimention, are important pollutant transporters. In order to attain adequate treatment effect, stormwater control measure design should include targeted removal of the smaller particle fractions.

Coagulation/flocculation is a treatment process that is ubiquitous in wastewater treatment and drinking water production, but very uncommon in a stormwater treatment context. Coagulation/flocculation has a proven ability to destabilize smaller particles, causing them to readily aggregate and settle out.

After the licentiate degree, Fredrik has in a study investigated how the choice and preparation of polymers affect a dewateringprocess of stormwater sediment from a stormwater pond. The study will result in two articles, where the first one will focus on the polymer demand and the treatment performance of the filtrate, i.e. the reject water that is returned to the pond in the dewatering process. The second article will focus on aspects of dewaterability of the stormwater sediment in relation to the polymer and the preparation.

In addition to the projects included in the PhD studies, a smaller study on the performance of electrocoagulation as a treatment process for stormwater was investigated. Specifically, the treatment performance and how it is affected by different current levels and material choice for the electrodes.

The PhD defense will take place in 2022.

Research Projects

Publications

Article in journal

Laboratory scale evaluation of coagulants for treatment of stormwater (2020)

Nyström. F, Nordqvist. K, Herrmann. I, Hedström. A, Viklander. M
Journal of Water Process Engineering, Vol. 36
Article in journal

Removal of metals and hydrocarbons from stormwater using coagulation and flocculation (2020)

Nyström. F, Nordqvist. K, Herrmann. I, Hedström. A, Viklander. M
Water Research, Vol. 182
Article in journal

Treatment of road runoff by coagulation/flocculation and sedimentation (2019)

Nyström. F, Nordqvist. K, Herrmann. I, Hedström. A, Viklander. M
Water Science and Technology, Vol. 79, nr. 3, s. 518-525
Conference paper

Removal of small particles from urban snow melt mixture by coagulation/flocculation and sedimentation (2017)

Nyström. F, Nordqvist. K, Herrmann. I, Hedström. A, Viklander. M
Part of: 14th IWA/IAHR International Conference on Urban Drainage, Conference Proceedings, 2017, 2017