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Journal of Soils and Sediments

, Volume 18, Issue 9, pp 2914–2923 | Cite as

Immobilization of phosphate by a Technosol spolic silandic: kinetics, equilibrium and dependency on environmental variables

  • Diego Arán
  • Juan Antelo
  • Sarah Fiol
  • Felipe Macías
Soils, Sec 2 • Global Change, Environ Risk Assess, Sustainable Land Use • Research Article
  • 84 Downloads

Abstract

Purpose

Phosphorus is an essential element that at high concentrations generates eutrophication of aquatic systems. In this study, we used batch and continuous tests to evaluate the efficiency of a Technosol to retain the phosphorus present (as phosphate) in aqueous samples.

Materials and methods

Phosphate sorption on Technosol was studied through batch and continuous experiments. Sorption kinetics and isotherms were investigated at different phosphate loadings and pH. In batch tests, we have determined how the presence of different anions (bicarbonate, sulphate, chloride, chromate and molybdate) affected phosphate retention. In continuous flow systems, phosphate immobilization was assessed as a function of flow rate, pH and Technosol concentration. Finally, the potential reutilization of the column was evaluated using consecutive sorption-desorption cycles.

Results and discussion

Phosphate sorption follows a pseudo-second-order kinetics model and a Langmuir isotherm model. The maximum sorption capacity ranged from 7.1 to 18.5 mg g−1, with larger values obtained at the highest pH. The main mechanisms involved in the sorption process were precipitation (as Ca-P minerals) and surface adsorption. In the column experiments, we observed a sorption reduction from 6.19 ± 0.06 to 2.37 ± 0.06 mg g−1 as the flow rate increased from 1.5 to 5.0 mL min−1. In addition, the retention capacity decreased by 14% when the height of the reactive layer was halved. Finally, the retention capacity of the Technosol spolic silandic recovered well after several sorption-desorption cycles, reaching 40% of the original value after first and second cycles.

Conclusions

The material effectively retained phosphate in batch and continuous flow systems. The Technosol spolic silandic is considered an efficient sorbent to remove the excess of phosphate from the soil solution and the aqueous system. This material may be a useful tool to mitigate or minimize two important environmental problems: eutrophication and the scarcity of natural sources of phosphate. The Technosol can thus be recycled as a phosphate-rich amendment and the leachates can be used to produce liquid fertilizer.

Keywords

Andic Decontamination Eutrophication Phosphate Sorption Technosol 

Notes

Acknowledgements

This work was supported by the Group of Excellence GI-1245, AMBIOSOL (Instituto de Investigaciones Tecnológicas − Universidad de Santiago de Compostela; GRC2014/003) financed by Xunta de Galicia and by the INTERREG V-A POCTEP Program (0366/RES2VALHUM/1/P). The authors belong to the CRETUS Strategic Partnership (AGRUP2015/02), co-funded by FEDER (UE). The authors thank the company CVAN (Centro de Valorización Ambiental del Norte. Touro, Spain) for preparing and supplying the Technosol. Two anonymous reviewers are gratefully acknowledged for their feedback and constructive comments, which have greatly contributed to improve this manuscript.

Supplementary material

11368_2018_1970_MOESM1_ESM.docx (160 kb)
ESM 1 (DOCX 159 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Soil Science and Agricultural ChemistryUniversity of Santiago de CompostelaSantiago de CompostelaSpain
  2. 2.Technological Research InstituteUniversity of Santiago de CompostelaSantiago de CompostelaSpain
  3. 3.Department of Physical ChemistryUniversity of Santiago de CompostelaSantiago de CompostelaSpain

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