Reaktiva sorbent för fastläggning av fosfor i Östersjöns bottnar
2013 (Swedish)Report (Other academic)
The release of phosphorus (P) from sediments is of concern for the eutrophication process of the Baltic Sea. In this investigation a number of reactive and alkaline sorbents were tested for their P removal efficiencies in the environment of anaerobic sediments. Batch, pot and column experiments were performed and simulated real bottom conditions. The calcium silicate material Polonite®, a commercial product for P-traps in wastewater treatment, performed best particularly as used for thin-layer placement. The by-product AOD slag also showed promising sorption capacity. The presence of P in the materials after four months use at sediment surfaces was documented by means of ESEM-EDS and the analysis with XANES revealed that for Polonite, amorphous calcium phosphate (ACP) and apatite had formed when saturated with pore water from anaerobic sediments. This study shows promising results for reactive materials to be used as binding agents for the sequestration of P from sediment. Further work will be performed to develop the technology with submerged thin-layer placement for full-scale application.
Place, publisher, year, edition, pages
Stockholm: BalticSea2020 , 2013. , 37 p.
Eutrophication, anaerobic sediment, reactive materials, thin-layer placement, AOD-slag, Polonite
Övergödning, syrefria sediment, reaktiva material, tunnskiktsbeläggning, slagg, Polonite
IdentifiersURN: urn:nbn:se:kth:diva-140004OAI: oai:DiVA.org:kth-140004DiVA: diva2:688213
ProjectsLevande kust - BalticSea2020
QC 201401232014-01-162014-01-162014-01-23Bibliographically approved