Abstract
The exponential growth in the use of motor vehicles is a key contributor to freshwater degradation. Current remediation techniques require prohibitively expensive contaminant treatment and extraction. Biochar represents an inexpensive option to ameliorate contaminants from motorway runoff. Biochar from Norway spruce (Picea abies (L.) Karst.) was produced under fast pyrolysis-gasification (450–500 °C for 90 s) and amended with wood ash and basaltic rock dust to evaluate sorption of Pb, Cu, Zn and Cd. The column study, designed to mimic field conditions, confirmed that unamended biochar can bind contaminants for short periods, but that the addition of amendments, particularly wood ash, significantly improves contaminant removal. Wood ash-amended biochar removed 98–100% of all contaminants during the study, driven by pH (r = 0.73–0.74; p < 0.01 dependent on metal species) and phosphorus levels causing precipitation (r = 0.47–0.59; p < 0.01, dependent on metal species). The contaminants’ progression through the biochar subsections in the column indicated that increasing the thickness of the biochar layer increased contaminant residence time and removal.
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The authors would also like to extend the acknowledgements to Dr. Katherine Ficken (Swansea University), Dr. Ian Mabbett (Swansea University), Richard Haine (Frog Environmental), Sion Brackenbury (TerrAffix Soil Solutions) and Peter Lanfear (TerrAffix Soil Solutions)
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Cairns, S., Robertson, I., Sigmund, G. et al. The removal of lead, copper, zinc and cadmium from aqueous solution by biochar and amended biochars. Environ Sci Pollut Res 27, 21702–21715 (2020). https://doi.org/10.1007/s11356-020-08706-3
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DOI: https://doi.org/10.1007/s11356-020-08706-3