Characterization of phosphorus interaction with sediments affected by acid mine drainage - relation with the sediment composition

Abstract

To cite this version:Lamia Boukemara, Chahrazed Boukhalfa, Sarah Azzouz, L. Reinert, L. Duclaux, et al.. Characterization of phosphorus interaction with sediments affected by acid mine drainage -relation with the sediment composition. International Journal of Sediment Research, Elsevier, 2017, 32 (4) ABSTRACTPhosphorus sorption capacity was investigated in surface sediments derived from an abandoned zinc-lead mine area located in northeastern Algeria. The forms and the distribution of phosphorus in the raw sediment were identified using the sequential chemical extractions method. Batch experiments were done to study the adsorption kinetics and isotherms. The pH effect was evaluated by macroscopic and infrared analyses. In raw sediment, speciation results show that phosphorus is dominantly bound to oxyhydroxides.Sorption experiments demonstrate that phosphorus uptake is principally related to sediment composition. The nature of the dominant iron oxyhydroxide has a substantial role in the adsorption capacity and the mechanism interaction. The adsorption kinetics can be described by the second order and Elovich models. The isotherms data are successfully modeled by the Temkin equation. The maximum phosphorus removal is reached under acidic pH.Spectroscopic analyses reveal that the predominance of jarosite implies electrostatic 2 interaction with sediment particles. However, in the case of schwertmannite predominance, phosphate ions are adsorbed by the ligand exchange mechanism.

Impact of the Climate Change and the Recent Development of an Artificial Tropical Estuary on the Mobility and Distribution of Phosphorus: Case of Vridi Channel (Côte d'Ivoire)

“…Their pH, close to neutrality, would also have contributed to the growth of the annual mean value of their PO content [19,20], while their significant reducing character would have partially inhibited it [21,22] over the study period. The decrease in their organic matter content [11,23] with their high Fe and Mn contents [21], unlike the decrease in their Mg content [19,29], over the period from April 2014 to March 2015 would have favored obtaining the annual mean value of their PO content greater than that determined over the period from October 2018 to September 2019. Also, the relatively high salinity of these sediments over the period from October 2018 to September 2019 would have further favored P-Mn conversion into PO [14,15], thereby helping to reduce the difference between their PO contents obtained over these two annual study period.…”

“…TP(VE), TMP, TOP and TP(AM) contents of these superficial sediments would have been of particular importance with their relatively high content of heavy titaniferous minerals [14,15] and the increase in their carbonate [28], Ca [26,27], Fe, Mn [21], Mg [19,29] and probably Al [24,25] contents determined over the period from April 2014 to March 2015 compared to those obtained on the period from October 2018 to September 2019. This would have been the case for their DBP and PBP contents, to which the strong water hydrodymism of this estuary would have contributed [9,10] to that.…”

“…Their significant reducing character would have partially inhibited the growth of their PL content [21,22], while their pH, close to neutrality, would have been favorable to this process [19,20] over all the study period. Also, their relatively high salinity over the period from October 2018 to September 2019 would have further contributed to in their PL content drop over all this annual period [14,15].…”

“…These P fractions become bioavailable under these conditions at high temperatures (Price et al, 2020). The formations of PO, PR and PL are favorable in acidic to slightly basic environments [19,20]. Regarding to the redox potential, Chen et al [21] and Zhao et al [22] noted that the high reducing conditions are more unfavorable to the formations of PL, PO and POR, but favorable to that of PE.…”

“…Regarding to Mg content of sediments, its relatively high importance leads to a decrease in their PO, P-Ca and P-CO 3 contents. A drop in their Mg content in limestone sediments further promotes P precipitation in the P-Ca fraction [19,29].…”