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Dolotfiltrering av fosfor och kväve i vattenlösning
University of Kalmar, School of Pure and Applied Natural Sciences.
2009 (English)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Eutrophication is a major problem in many sea areas today. One of the main reasons for the eutrophication is the great leakage of phosphorus and nitrogen to our seas, lakes and rivers. Phosphorus (P) and nitrogen (N) are commonly the main limiting nutrients in soil and water. This leakage comes partly from agricultural land when it is dressed with fertilizer with large amount of P and N, which the crops can not take up, especially not when fertilization is taking place under unsuitable conditions when nutrient uptake is low. One of the Swedish environmental objectives, “no eutrophication” means that the levels of eutrophicating substances in soil and water must be so low that they do not have a negative impact on human health, biodiversity or the potential use of soil and water.

The government aims to reduce phosphorus losses to water with 20 % by 2010 compared with 1995 levels and the largest reductions were planned to be made in areas where environmental impact is greatest. Currently there are no solutions that are efficient enough and financially sustainable in order to achieve this objective when it comes to P. N is caught quite well by well-functioning wetlands but P is not.

This study focuses on a possible method to counter phosphorus losses by allowing the phosphate rich solutions and the natural water to drain through dolomite powder, (Mg, Ca)(CO3)2. Calcium has the potential to precipitate phosphate and form solid calcium phosphate, CaPO4. If this adsorption is sufficiently effective, the lime could be reused on farmland so that fertilization and liming could take place at the same time with completely recycled materials. In order to evaluate the efficiency of dolomite filters nutrient solution are filtered through columns filled with dolomite with a method called up flow percolation test. Tests have been carried out for both synthetic NP solutions and natural P-enriched waters. The results show, for both the synthetic and the natural waters, that P is adsorbed very efficiently to dolomite, while N was less adsorbed.

Comparisons with other Calcium rich minerals (magnedol and Öland limestone) showed that dolomite was the best adsorbent of P. Both magnedol and Öland limestone are found locally in Sweden but magnedol seems to be the more efficient of these two.

Considering the results of this research, lime-filter drainage seem to have potential in diminishing the leakage of P and N.

 

Abstract [sv]

Övergödning är ett stort problem inte bara på nationellt plan utan även globalt. En av de främsta anledningarna till övergödningen är läckaget av fosfor och kväve till våra sjöar, hav och vattendrag. Fosfor (P) och kväve (N) är de huvudsakliga tillväxtbegränsande näringsämnena i mark och vatten.

Detta projekt fokuserar på en möjlig metod för att motverka läckaget av P genom att låta fosfatrika näringslösningar och naturliga vatten att filtrera genom dolomitkalk, (Mg, Ca)(CO3)2. Kalcium fäller ut P och bildar fast kalciumfosfat. Om denna adsorbtion är tillräckligt effektiv kommer kalken tillsammans med P återanvändas på åkrarna så att gödsling och kalkning sker på samma gång med helt återvunnet material. Undersökningar av effektiviteten av kalkfiltrering har testats genom så kallade perkolationstest (på engelska kallat ”upflow percolation test”). Testet har utförts både på syntetiska NP- lösningar och naturliga vatten med hög fosforhalt. Resultaten visar, både för de syntetiska vattnen och de naturliga vattnen, att P adsorberas mycket effektivt av dolomitkalk medan N bara adsorberas till viss del.

Vid jämförelse med andra kalciumrika mineraler (magnedol och ölandskalk) visade sig dolomit vara den överlägset effektivaste adsorbenten av P. Både magnedol och ölandskalk tillgängligt på lokalt plan i Sverige men magnedol är den utav de två som är den bästa adsorbenten av P. 

Att investera i kalkfilter är av denna undersökning att döma således ingen dålig satsning när det gäller att minska läckaget av P och N.  

Place, publisher, year, edition, pages
2009. , 31 p.
Keyword [en]
Dolomite, lime-filter drainage, Up flow percolation, phosphorus removal
Keyword [sv]
Dolomit, kalkfiltrering, perkolationstest, fosforläckage
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-22649OAI: oai:DiVA.org:lnu-22649DiVA: diva2:573346
Subject / course
Environmental Science
Educational program
Environmental Analysis Programme, 180 credits
Presentation
(Swedish)
Uppsok
Life Earth Science
Supervisors
Examiners
Available from: 2013-01-07 Created: 2012-11-30 Last updated: 2013-01-07Bibliographically approved

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  • apa
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