Bed filters for phosphorus removal in on-site wastewater treatment: Removal mechanisms and sustainability
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
For many surface waters, phosphorus (P) leaching is a serious problem that should be minimized to prevent eutrophication. In Sweden there is a demand for physical and technical development of high-performance P removal techniques to reduce phosphorus leaching from on-site wastewater treatment systems to the Baltic Sea. However, although these systems are designed to reduce eutrophication there are also other environmental impacts to be considered when implementing them in on-site systems; energy use and global warming potential are two examples. This study has investigated several bed filter materials (reactive media and natural soils) for their total environmental impact (in commercial applications) as well as for the predominating chemical phosphorus removal mechanisms. The use of life cycle assessment revealed that several reactive bed filters are relatively energy-consuming due to the material manufacturing process. Characterization of phosphorus compounds in used reactive media provided evidence for calcium phosphate precipitation as the predominating P removal mechanism in alkaline filter materials. However, in soil treatment systems with noncalcareous soils, batch experiments and extractions suggested that aluminium compounds were important for P removal. According to mass balance calculations that compared accumulated P with the estimated P load in a soil treatment system, the long term P removal capacity was very low; only 6.4 % of the applied phosphorus had been removed during 16 years of operation.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology (KTH) , 2010. , 20 p.
Trita-LWR. LIC, ISSN 1650-8629 ; 2049
On-site wastewater treatment, Eutrophication, Environmental impact assessment, Phosphorus removal mechanisms, Soil infiltration, Reactive bed filters
Other Environmental Engineering Water Engineering Soil Science
IdentifiersURN: urn:nbn:se:kth:diva-12048ISBN: 978-91-7415-578-5OAI: oai:DiVA.org:kth-12048DiVA: diva2:300260
2010-03-19, V3, KTH, Teknikringen 72, third floor, Stockholm, 13:15 (English)
Gustafsson, Jon Petter, ProfessorRenman, Gunno, UniversitetlektorKärrman, Erik
QC 201104132010-02-262010-02-252013-04-19Bibliographically approved
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