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Jaouadi S.,Water Research and Technologies Center | Mlayah A.,Georesources Laboratory | Jellali S.,Water Research and Technologies Center
Desalination and Water Treatment

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. © 2013 © 2013 Balaban Desalination Publications. All rights reserved. Source

Said M.B.,Water Research and Technologies Center | Otaki M.,Ochanomizu University | Hassen A.,Water Research and Technologies Center
Annals of Microbiology

The infectivity rates of Salmonella typhi's phage was used as a bio-indicator to detect the presence of viable but non cultivable bacteria after irradiation by an increasing number of pulsed UV light. Indeed, the combination of a conventional method used to measure colony-forming ability of UV-irradiated bacteria, and the study of relationship between host bacteria and a suitable phage can reveal the existence of active bacteria which lose the cultivability in usual culture media, but keep viability and phage susceptibility. © Springer-Verlag and the University of Milan 2011. Source

Hechmi N.,Water Research and Technologies Center | Hechmi N.,National Agronomic Institute of Tunisia 43 | Aissa N.B.,National Agronomic Institute of Tunisia 43 | Abdennaceur H.,Water Research and Technologies Center | Jedidi N.,Water Research and Technologies Center
International Journal of Phytoremediation

The ubiquitous coexistence of heavy metals and organic contaminants was increased in the polluted soil and phytoremediation as a remedial technology and management option is recommended to solve the problems of co-contamination. Growth of Zea mays L and pollutant removal ability may be influenced by interactions among mixed pollutants. Pot-culture experiments were conduced to investigate the single and interactive effect of cadmium (Cd) and pentachlorophenol (PCP) on growth of Zea mays L, PCP, and Cd removal from soil. Growth response of Zea mays L is considerably influenced by interaction of Cd and PCP, significantly declining with either Cd or PCP additions. The dissipation of PCP in soils was notably affected by interactions of Cd, PCP, and plant presence or absence. At the Pentachlorophenol in both planted and non-planted soil was greatly decreased at the end of the 10-week culture, accounting for 16-20% of initial extractable concentrations in non-planted soil and 9-14% in planted soil. With the increment of Cd level, residual pentachlorophenol in the planted soil tended to increase. The pentachlorophenol residual in the presence of high concentration of Cd was even higher in the planted soil than that in the non-planted soil. © 2013 Copyright Taylor and Francis Group, LLC. Source

Wahab M.A.,Water Research and Technologies Center | Jellali S.,Water Research and Technologies Center | Jedidi N.,Water Research and Technologies Center
Bioresource Technology

In the present study, the effects of temperature and pH on ammonium biosorption onto Posidonia oceanica fibers were investigated. The results showed that the ammonium biosorption onto these fibers occurred for a wide pH range and the adsorption capacity of these fibers increased with increasing temperature. The modeling studies showed that the ammonium biosorption was well described by the pseudo-second-order model, predicting therefore chemisorption interactions-type at earlier stages and intraparticle diffusion at later stages. The ammonium biosorption was governed by film diffusion process at various temperatures. Besides, equilibrium data were very well represented by Langmuir isotherm, which confirmed the mono-layer coverage. The use of P. oceanica fibers presents an interesting option for both tertiary wastewater treatment (as a possible non-conventional biosorbent for the removal of ammonium), and waste recycling (as a fertilizer and compost). © 2010 Elsevier Ltd. Source

Mlayah A.,Water Research and Technologies Center | Jellali S.,Water Research and Technologies Center
International Journal of Environmental Science and Technology

Lead removal from synthetic solutions and real wastewater by Bianco Gioia marble wastes as abundant, renewable and eco-friendly materials was studied under different experimental conditions in a continuous stirring tank reactor. These marble wastes were found to be very efficient in removing lead for several experimental situations. Indeed, for initial aqueous pH values higher than 3.6, a lead removal efficiency of about 100 % was achieved even for high aqueous concentrations (200 mg L−1), important feeding flow rates (60 mL min−1) and low marble waste dosage (2 g L−1). The best removal capacity (175.7 mg g−1) was obtained for an initial lead concentration of 200 mg L−1, a marble waste dose of 5 g L−1 and an aqueous pH of 5. Even using the real wastewater with low aqueous pH (1.1), lead was also completely removed using 20 g L−1 of the tested marble wastes. According to the energy-dispersive spectroscopy and X-ray diffraction analyses, lead removal seems to be controlled by both precipitation as cerussite (PbCO3) and hydrocerussite (Pb3(CO3)2(OH)2), and adsorption onto the surface particles through cation exchange and complexation. The proposed low-cost material efficiently removes lead present in synthetic solutions and real wastewaters and constitutes an interesting environmental management option. © 2014, Islamic Azad University (IAU). Source

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