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Schütz, Johanna, 2016. A comparison of two treatment methods to reduce internal phosphorous cycling in lakes: surface versus injection application. Second cycle, A2E. Uppsala: SLU, Dept. of Aquatic Sciences and Assessment

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Abstract

When external nutrients have been reduced from a lake, the internal loading can still be high due to a heavy load of phosphorous (P) in the sediments. Aluminium (Al) treatment has been used for several decades to permanently bind P in sediments to prevent further internal loading. The common method is by surface application of an Al salt. In recent years the method has been developed where a slurry of Al salt is injected directly into the sediments. In this study the efficiency and costs of injection application were compared to previous studies where surface application was used. The results presented in this study indicated that the Al:P ratio in the lakes did differ much, and would thus imply that the binding efficiency is similar for the two application methods. When treatment cost was compared to the amount of P bound by Al in the sediment, the results were also similar, suggesting both methods were equally beneficial for removing excess P from the P cycle in lakes.

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Den interna belastningen i sjöar kan fortsätta att bidra till övergödning trots att externa källor av näringsämnen har minskats. Övergödningen orsakas av fosfor (P) i sedimenten vilket kan fortsätta att frigöras till vattenmassan. Aluminium (Al) har i flera decennier använts för att permanent binda Al i sedimenten och därmed minska den interna belastningen. I den vanligaste appliceringsmetoden tillsätts ett aluminiumsalt från sjöytan. Saltet fälls sedan ut sjösedimentet och binder till P i sedimentet för att förhindra intern belastning. Under senare år har metoden utvecklats där aluminiumsaltet injiceras direkt i sjösedimenten. Denna studie har undersökt bind-ningseffektiviteten och kostnaderna med injiceringsmetoden och jämfört resultatet med tidigare studier där ytfällning har använts. Resultatet visar att Al:P kvoten var lika i båda metoderna, vilket tyder på att båda metoderna är likvärdiga att avlägsna fosforöverskottet i sjöar.

Main title:A comparison of two treatment methods to reduce internal phosphorous cycling in lakes: surface versus injection application
Authors:Schütz, Johanna
Supervisor:Huser, Brian
Examiner:Futter, Martyn
Series:UNSPECIFIED
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2016
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM010 Soil and Water Management - Master's Programme 120 HEC
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Keywords:eutrophication, restoration, aluminium, phosphorous, övergödning, restaurering, aluminium, fosfor
URN:NBN:urn:nbn:se:slu:epsilon-s-5167
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-5167
Subjects:Water resources and management
Language:English
Deposited On:22 Feb 2016 14:00
Metadata Last Modified:23 Feb 2016 10:54

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