Abstract
Purpose
Biochar is a promising alternative for the remediation of areas contaminated by mining waste. However, depending on the pyrolysis temperature, the biochar may not be equally effective for immobilizing cationic and anionic contaminants. Our objectives in this study were to evaluate (i) the effect of biochar on arsenic (As) and lead (Pb) availabilities in sediments of a contaminated area and (ii) the effect of the biochar pyrolysis temperatures on the enzymatic activity of the microorganisms.
Material and methods
The contaminated sediment was sampled in an area that served as a lead ore refining plant for 10 years in Brazil. The biochar was produced from sugarcane straw (Saccharum officinarum) and pyrolyzed at 350 (BC350), 550 (BC550), and 750 °C (BC750). We performed an incubation experiment to investigate the effects of pyrolysis temperature on the dynamics of As and Pb in the sediment. The availabilities of As and Pb were measured by the diffusive gradients in the thin film, and the quality of organic carbon in the sediment was investigated by laser-induced fluorescence spectroscopy and UV–vis spectroscopy in solution. In addition, the effect of the application of the biochar on the microbial community was evaluated through the activities of the enzymes β-glucosidase, acid, and alkaline phosphatase.
Results and discussion
The application of biochar changed the chemical composition of the carbon structures and altered the availability of As and Pb. Increases in As availability after application of biochar is directly linked to the chemical composition of the dissolved organic carbon present in BC350, with the activity of phosphatase and phosphorus release (BC550 and BC750) and, finally, with pH (B550 and BC750). The availability of Pb was reduced after the application of the B550 and B750, which suggests that pyrolyzed biochars at high temperatures may help to reduce the environmental risk associated with Pb contamination. The application of biochar reduced the activity of the enzymes β-glucosity and acid phosphatase, while the alkaline phosphatase activity increased and was dependent on the pyrolysis temperature.
Conclusions
The increase in As availability after the application of the biochar is related to the chemical composition of dissolved organic carbon and the increase in phosphatase activity. The availability of Pb has been reduced due to the increase in pH, which suggests that pyrolyzed biochars at high temperatures may help to reduce the environmental risk associated with Pb contamination.
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Availability of data and materials
The datasets generated and/or analyzed during the current study are not publicly available due (REASON WHY DATA ARE NOT PUBLIC) but are available from the corresponding author on reasonable request.
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Acknowledgements
The first author gratefully thanks the São Paulo Research Foundation (FAPESP) (grants #2019/06897-9) and the Brazilian Council for Scientific and Technological Development—Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (grants #140830/2018-9) for the scholarship granted for this research. The third author thanks CNPq (grants #306429/2018-7) for the scholarship granted for this research.
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This study was partially funded by CNPq and the Coordination for the Improvement of Higher Education Personnel—Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) – Finance Code 001.
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M.B.S.: formal analysis, investigation, writing—original draft, writing—review and editing. D.M.B.P.M.: writing—revision and editing. L.R.F.A.: acquisition of financing, writing—revision and editing. All authors read and approved the final manuscript.
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Soares, M.B., Milori, D.M.B.P. & Alleoni, L.R.F. How does the biochar of sugarcane straw pyrolysis temperature change arsenic and lead availabilities and the activity of the microorganisms in a contaminated sediment?. J Soils Sediments 21, 3185–3200 (2021). https://doi.org/10.1007/s11368-021-03028-4
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DOI: https://doi.org/10.1007/s11368-021-03028-4