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Phosphate removal u...
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Johansson, Lena,1967-Royal Institute of Technology
(författare)
Phosphate removal using blast furnace slags and opoka-mechanisms
- Artikel/kapitelEngelska2000
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-19466
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-19466URI
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https://doi.org/10.1016/S0043-1354(99)00135-9DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-21856URI
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Språk:engelska
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Sammanfattning på:engelska
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Klassifikation
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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QC 20100525
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The abiotic sorption efficiency of on-site wastewater treatment systems can be improved by using a strongly sorbing filter material that, if it retains phosphorus (P) in a plant available way, can be used as fertiliser when P saturation is achieved. Two materials, blast furnace slag and the siliceous sedimentary rock opoka, have shown a high P sorption capacity and were included in a set of experiments to investigate the P retention mechanisms from model P-solution. Experiments focusing on the P sorption, capacity and calcium (Ca) and PO4 determination were carried out. The pH was also measured. The P sorption experiment showed that some slags were efficient P retainers, while the opoka was the least efficient P retainer. The pH decreased in all samples as a function of P addition. In the slag samples, the Ca concentration also decreased as a function of P addition, suggesting Ca-P precipitation as the major P removal mechanism for the slag. The Ca and PO4 speciation data ruled out the formation of amorphous calcium phosphates and/or octacalcium phosphate as the major P removal mechanism. However, the calculated ion activity products displayed clear evidence that hydroxyapatite had precipitated above a certain critical supersaturation limit. This would explain the poor P retention efficiency of the opoka samples in this study as the ion activity products were too low. The finding that direct hydroxyapatite formation is the predominant P removal mechanism might have important implications for their possible use as fertiliser due to the poor solubility of hydroxyapatite.
Ämnesord och genrebeteckningar
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blast furnace slag
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fertiliser
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hydroxyapatite
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opoka
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P removal mechanisms
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phosphorus
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Gustafsson, Jon PetterKTH,Mark- och vattenteknik,Royal Institute of Technology, Sweden(Swepub:kth)u1ep3pgj
(författare)
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Royal Institute of TechnologyMark- och vattenteknik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Water Research34:1, s. 259-2650043-13541879-2448
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