In situ remediation of metal(loid)-contaminated lake sediments with alkali-activated blast furnace slag granule amendment: A field experiment

Abstract Purpose Adsorbent amendment to contaminated sediments is one in situ remediation method decrease the bioaccessibility of pollutants from sediments. In this work, alkali-activated blast furnace slag (BFS) granules were used a field experiment at Lake Kivijärvi (Finland). The lake was heavily affected by mining accident 2012, which released significant peak load metals and sulfate. purpose work evaluate performance novel material for real conditions with preliminary cost estimation. Methods Alkali-activated BFS prepared characterized composition, microstructure, surface properties. Two mesocosms placed lake: granule dosing another without. Sediment pore water samples collected after two-week period. Similar small-scale performed laboratory three-month duration. Bioaccessibility assessed three-stage leaching procedure. Results effective decreasing mobility Fe, Zn, Ni, Cr all stages approximately 50–90% comparison unamended sediment mesocosm experiment. Laboratory-scale incubation experiments also indicated decreased release Ba, Co, Al, Mg, Mn S. estimated costs lower than removal dredging off-site treatment. Conclusion results showed preliminarily effectiveness alkaline-activated metal-contaminated However, topics requiring further study are trace elements impact on pH.