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Phosphate removal using blast furnace slags and opoka-mechanisms
Royal Institute of Technology.ORCID-id: 0000-0003-0231-564X
Royal Institute of Technology, Sweden.
2000 (engelsk)Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Water Research, ISSN 0043-1354, Vol. 34, nr 1, s. 259-265Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

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2000. Vol. 34, nr 1, s. 259-265
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URN: urn:nbn:se:mdh:diva-21856DOI: 10.1016/S0043-1354(99)00135-9ISI: 000084304300029Scopus ID: 2-s2.0-0033622688OAI: oai:DiVA.org:mdh-21856DiVA, id: diva2:654944
Tilgjengelig fra: 2013-10-09 Laget: 2013-10-09 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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