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Water 2010, 2(4), 826-837; doi:10.3390/w2040826

The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review

School of Sustainable Development of Society and Technology, Mälardalen University, P.O. Box 883, SE-721 23 Västerås, Sweden
Received: 30 September 2010 / Accepted: 19 October 2010 / Published: 28 October 2010
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Abstract

Research on Phosphorus (P) removal capacity by blast furnace slags (BFS) has been undertaken in Sweden for the last decade. Both laboratory experiments and field trials have been carried out. While laboratory investigations revealed that BFS has a high P-sorption capacity (95–100%), P removal in field trials was much lower, ranging from 40 to 53%. In addition, a number of problems have been observed in BFS field testing including clogging, sulfuric odor and environmental (regulatory) concerns about possible leaching of heavy metals from the slag. In spite of these problems, and questioning by the environmental regulatory authorities, research continues to provide evidence that BFS can be regarded as a suitable filter media, and attempts have also been undertaken in order to further improve the P-removal capacity of this adsorbing material.
Keywords: ageing of slag; chemical improvement; clogging; sulfuric release; wastewater ageing of slag; chemical improvement; clogging; sulfuric release; wastewater
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Johansson Westholm, L. The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review. Water 2010, 2, 826-837.

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