Dolomite used in phosphate water treatment: Desorption processes, recovery, reuse and final disposition

Journal of Environmental Management
M Natalia PiolSusana P Boeykens

Abstract

Desorption is a method that contributes to two important aspects for the sustainability of the water treatments that involve adsorption processes: a) the regeneration of the adsorbent making it reusable in several efficient cycles and, b) the recovery of the adsorbate. In previous studies, it was shown that dolomite constituted an efficient adsorbent of phosphates from aqueous solutions. Once the adsorbent saturation is achieved, it becomes useless for further uses, generating waste, a new environmental problem if it could not be properly disposed. In this work, the main objectives were to study the phosphate desorption process for the recovery and reuse of dolomite and to evaluate the possibilities of a final disposal of exhausted dolomite for agricultural soil improvement and applying the desorbed phosphate as fertilizer. The most efficient agent for the desorption process was 1 M NH4Cl. Ultrasound evidenced a negative effect on desorption. The pseudo-second order model fitted better the experimental data and the equilibrium time was 30 min. Up to four efficient adsorption-desorption cycles were obtained. Phosphate bioavailability of exhausted dolomite was assessed with autochthonous microorganisms. The obtained extracts were...Continue Reading

References

Oct 10, 2001·Advances in Colloid and Interface Science·A Dabrowski
Mar 3, 2017·Journal of Environmental Management·Weiya HuangDan Li
May 20, 2017·Journal of Environmental Management·Susana P BoeykensCristina Vázquez
Jun 6, 2018·Journal of Environmental Management·Kailasam SaranyaThangavel Balasubramanian

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Citations

Dec 2, 2020·Journal of Environmental Management·Hrvoje MikulčićRaf Dewil

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