Abstract
Adsorption of biochars (BC) produced from cash crop residuals is an economical and practical technology for removing nutrients from agricultural runoff. In this study, BC made of orange tree trunks and tea tree twigs from the Laoguanhe Basin were produced and modified by aluminum chloride (Al-modified) and ferric sulfate solutions (Fe-modified) under various pyrolysis temperatures (200°C–600°C) and residence times (2–5 h). All produced and modified BC were further analyzed for their abilities to adsorb ammonia and phosphorus with initial concentrations of 10–40 mg/L and 4–12 mg/L, respectively. Fe-modified Tea Tree BC 2h/400°C showed the highest phosphorus adsorption capacity of 0.56 mg/g. Al-modified Orange Tree BC 3h/500°C showed the best performance for ammonia removal with an adsorption capacity of 1.72 mg/g. FTIR characterization showed that P = O bonds were formed after the adsorption of phosphorus by modified BC, N-H bonds were formed after ammonia adsorption. XPS analysis revealed that the key process of ammonia adsorption was the ion exchange between K+ and NH +4 . Phosphorus adsorption was related to oxidation and interaction between PO 34 and Fe3+. According to XRD results, ammonia was found in the form of potassium amide, while phosphorus was found in the form of iron hydrogen phosphates. The sorption isotherms showed that the Freundlich equation fits better for phosphorus adsorption, while the Langmuir equation fits better for ammonia adsorption. The simulated runoff infiltration experiment showed that 97.3% of ammonia was removed by Al-modified Orange tree BC 3h/500°C, and 92.9% of phosphorus was removed by Fe-modified Tea tree BC 2h/400°C.
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Acknowledgements
This research was supported by the Major Science and Technology Programs for Water Pollution Control and Management of China (Nos. 2012ZX07205-001 and 2017ZX7103-007). The authors would like to express their sincere gratitude to Gan Lili and Tong Chi for their kind advision; to Professor Viktor Dotsenko for his invaluable assisstance in organic chemistry analysis; and to Kate Smith, Thomas C. Mashall and Mary Elizabeth Smith for their careful proofreading of the manuscript.
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Highlights
• Orange tree residuals biochar had a better ability to adsorb ammonia.
• Modified tea tree residuals biochar had a stronger ability to remove phosphorus.
• Partially-modified biochar could remove ammonia and phosphorus at the same time.
• The real runoff experiment showed an ammonia nitrogen removal rate of about 80%.
• The removal rate of total phosphorus in real runoff experiment was about 95%.
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Salimova, A., Zuo, J., Liu, F. et al. Ammonia and phosphorus removal from agricultural runoff using cash crop waste-derived biochars. Front. Environ. Sci. Eng. 14, 48 (2020). https://doi.org/10.1007/s11783-020-1225-1
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DOI: https://doi.org/10.1007/s11783-020-1225-1