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Soil amendment with nanoresidues from water treatment increases P adsorption in saline soils

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Abstract

Soil salinity is a major food issue in Egypt because salinity modifies P nutrient availability for crop plants. Residues from wastewater treatment can be added to soils for fertilization, but there is actually little knowledge on the effect of nanoresidues on P availability. Here, we mixed nanoresidues, obtained by grinding raw residues of water treatment, with soils of increasing salinity. We studied P adsorption and nanoresidue morphology. Results show that the addition of 0.5% of nanoresidues increases P adsorption from 9.43 to 93.46 µg g−1 for non-saline soils and from 12.02 to 153.85 µg g−1 for saline soils. Accordingly, the P Freundlich constant (KF) increased from 64.60 to 515.94 mL g−1 in the saline soil. Fourier transform infrared and X-ray diffraction data suggest that ligand exchange and precipitation are the main mechanisms.

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Acknowledgements

The author would like to thank the Laboratory of Soil and Water Sciences, Agriculture faculty, Tanta University, Egypt, for their assistance during this work.

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Correspondence to Esawy Mahmoud.

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Mahmoud, E., El Baroudy, A., Ali, N. et al. Soil amendment with nanoresidues from water treatment increases P adsorption in saline soils. Environ Chem Lett 18, 171–179 (2020). https://doi.org/10.1007/s10311-019-00917-6

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  • DOI: https://doi.org/10.1007/s10311-019-00917-6

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