TY - JOUR
T1 - Phosphates removal from aqueous solutions by powdered marble wastes under static conditions
AU - Jaouadi, Safa
AU - Mlayah, Ammar
AU - Jellali, Salah
N1 - Funding Information:
This research work has been carried out in the framework of a Tunisian national project entitled: Removal and valorization of nutrients from wastewaters by low-cost materials. The authors would like to thank the Tunisian ministry of higher education and scientific research for financial support.
PY - 2014
Y1 - 2014
N2 - Powdered marble wastes (PMW) generated by marble industry with abundant amounts were used in this study as low-cost materials to investigate the phosphate anions removal from synthetic solutions. Batch assays were carried out to study the effect of some key parameters such as phosphates influent concentrations, contact time, PMW dosage, and pH on phosphate removal. The batch experiments results showed that PMW have relatively high phosphates adsorption capacity compared to several natural materials. Indeed, the adsorption capacity determined from Langmuir isotherm exceeds 35 mg g-1. Furthermore, the adsorption process is favored for acidic pH values and also when increasing initial aqueous concentrations and marble wastes dosage. For an initial aqueous phosphates concentration of 100 mg L-1, the removal efficiency is close to 90% for adsorbent dosage higher than 2 g L-1. On the other hand, the adsorption modeling studies showed that phosphates adsorption is well described by second-order model and was essentially controlled by the boundary layer diffusion process. The cost effective and high adsorptive capability of PMW make them attractive and promising materials for phosphates anions removal and recovery from secondary treated wastewaters with the possibility of agronomic reuse as fertilizer.
AB - Powdered marble wastes (PMW) generated by marble industry with abundant amounts were used in this study as low-cost materials to investigate the phosphate anions removal from synthetic solutions. Batch assays were carried out to study the effect of some key parameters such as phosphates influent concentrations, contact time, PMW dosage, and pH on phosphate removal. The batch experiments results showed that PMW have relatively high phosphates adsorption capacity compared to several natural materials. Indeed, the adsorption capacity determined from Langmuir isotherm exceeds 35 mg g-1. Furthermore, the adsorption process is favored for acidic pH values and also when increasing initial aqueous concentrations and marble wastes dosage. For an initial aqueous phosphates concentration of 100 mg L-1, the removal efficiency is close to 90% for adsorbent dosage higher than 2 g L-1. On the other hand, the adsorption modeling studies showed that phosphates adsorption is well described by second-order model and was essentially controlled by the boundary layer diffusion process. The cost effective and high adsorptive capability of PMW make them attractive and promising materials for phosphates anions removal and recovery from secondary treated wastewaters with the possibility of agronomic reuse as fertilizer.
KW - Batch
KW - Marble wastes
KW - Phosphates
KW - Removal
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U2 - 10.1080/19443994.2013.807036
DO - 10.1080/19443994.2013.807036
M3 - Article
AN - SCOPUS:84894496957
SN - 1944-3994
VL - 52
SP - 1716
EP - 1724
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
IS - 7-9
ER -