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Blast furnace slag as phosphorus sorbents - column studies
Royal Institute of Technology, Sweden.ORCID iD: 0000-0003-0231-564X
1999 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Science of the Total Environment, ISSN 0048-9697, Vol. 229, no 1-2, p. 89-97Article in journal (Refereed) Published
Abstract [en]

Filter substrates that efficiently remove phosphorus (P) from wastewater can be used to optimise the nutrient removal by on-site wastewater treatment systems. A number of filter substrates have been investigated and the industrial by-product blast furnace slag has attracted attention as a promising substrate. To further evaluate the sorption and attenuation of PO(4)(3-), a column experiment was carried out under conditions of intermittent P loading. Two types of slag were used; crystalline slag (CS) and amorphous slag (AS). The slags were available in two particle sizes; 0-0.125 mm and 0.25-4 mm, respectively. The slags were mixed with inert sand to improve the hydraulic conductivity. In addition to the column experiment, a P fractionation experiment was conducted. The sorption experiment indicated that the removal of P by the CS (0.25-4 mm), the AS (0.25-4 mm) and the AS (0-0.125 mm) columns at the end of the experiment exceeded 95%. In the other columns, the P sorption had decreased remarkably indicating a beginning saturation of the substrates. The P fractionation experiment showed that the P sorption was largest in the uppermost layers. Clear gradients of the P sorption in the downward direction could also be observed. It was concluded that the P sorption by the coarser slags was high at the end of the experiment indicating that saturation had not been achieved.

Place, publisher, year, edition, pages
1999. Vol. 229, no 1-2, p. 89-97
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-21858DOI: 10.1016/S0048-9697(99)00072-8ISI: 000081383400008Scopus ID: 2-s2.0-0033043301OAI: oai:DiVA.org:mdh-21858DiVA, id: diva2:654949
Available from: 2013-10-09 Created: 2013-10-09 Last updated: 2017-12-06Bibliographically approved

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Johansson, Lena

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