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Barrouk I.,Laboratory of Materials | Alami Younssi S.,Laboratory of Materials | Kabbabi A.,Cherifian Office of Phosphates OCP | Persin M.,European Institute of Membranes | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2015

This study is related to the development of microfiltration and ultrafiltration ceramic membranes using natural and synthetic phosphates. Macroporous support was formed by extrusion of a ceramic paste derived from natural Moroccan apatite coming from the mine of Khouribga. The preparation and characterization of support and membranes layers were described in this work. Microfiltration MF membrane from natural Moroccan phosphate and ultrafiltration UF membrane from PTP (Potassium Titanyl Phosphate) were performed respectively by slip casting process and sol-gel route. The support fired at 1000 °C showed a pore diameters centered near 10 μm and a porosity of about 43%. The pore diameters are 0.35 μm and 10 nm for microfiltration and ultrafiltration layers, respectively. The measured water permeability is about 778.6 L.h-1.m-2.bar-1 and 80 L.h-1.m-2.bar-1 for MF and UF membranes, respectively. Elaborated membranes were successfully applied as a complementary process for decolorizing concentrated textile effluent pretreated by coagulation-flocculation. These membranes present interesting retention properties with regard to residual turbidity and dye remained in the effluent after the chemical pre-treatment.

Majouli A.,Laboratory of Materials | Tahiri S.,Laboratory of Water and Environment | Alami Younssi S.,Laboratory of Materials | Loukili H.,Laboratory of Materials | Albizane A.,Laboratory of Materials
Ceramics International | Year: 2012

In this study, an original microfiltration tubular membrane (M1) made from local Moroccan Perlite was used to treat three wastewater types: effluents coming from beamhouse section of tannery (effluent A), textile effluent coming from jeans washing process (effluent B), and dicing wafer effluent generated by electronic industries (effluent C). The prepared membrane is composed of two layers of Perlite with two different granulometries: a macroporous support with a pore diameter centered near 6.6 μm and porosity of about 42%, and a microfiltration layer, performed by slip casting method, with a mean pore size of 0.27 μm. The water permeability determined of the membrane is 815 L/h m 2 bar. Tangential microfiltration using Perlite membrane proved to be effective in removing pollutants from the three effluents with almost the same efficiencies than that obtained with a commercial Alumina membrane (M2) with a pore diameter of 0.2 μm and a water permeability of 1022 L/h m 2 bar. Tangential microfiltration process operated at lower pressure (1 bar) was seen to remove turbidity from the three feeds completely. Perlite membrane allowed significant reduction of Chemical Oxygen Demand COD (50-54%) and Total Kjeldahl Nitrogen TKN (56%) of beamhouse effluent. It showed a significant decrease of COD (54-57%) and a complete discoloration of textile wastewater. © 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Chabaane L.,Laboratory of Water and Environment | Tahiri S.,Laboratory of Water and Environment | Albizane A.,Laboratory of Materials | Krati M.E.,Laboratory of Water and Environment | And 2 more authors.
Chemical Engineering Journal | Year: 2011

Chestnut (C) and mimosa (M) tannins immobilized on chrome shavings (CS) as an adsorbent have been proposed to be an efficient and economical alternative in hexavalent chromium removal from aqueous solutions. The adsorption of hexavalent chromium onto chrome shavings-tannin (CS-T) adsorbents was performed using batch equilibrium technique at 25 ± 2 °C. The effect of pH is highly important especially in the case of high concentrations of hexavalent chromium. The maximum chromium uptake was obtained at pH 4. Two hours of contact time are enough to reach equilibrium. Sorption of chromium on CS-T was found to follow a pseudo-second order kinetic model (with correlation coefficients greater than 0.999). The adsorption equilibrium data fitted the Langmuir model well. The maximum adsorption capacity, of dry immobilized tannin adsorbent with 11.6% polyphenol, reached 42. mg. Cr/g and 38. mg. Cr/g in the case of chestnut and mimosa tannins, respectively. © 2011 Elsevier B.V.

El Kadiri Boutchich G.,Laboratory of Water and Environment | Tahiri S.,Laboratory of Water and Environment | Mahi M.,International Institute for Water and Sanitation IEA ONEE | Gallart-Mateu D.,University of Valencia | And 4 more authors.
Journal of Materials and Environmental Science | Year: 2015

In this work, the physico-chemical characteristics of activated sludge from domestic sewage treatment plants were first determined. The composting of waste activated sludge alone (100% w/w) and in presence of sawdust (25% w/w) during nine months was then investigated. Aerobic fermentation was monitored during the first month in reactors. After that, samples were transferred in perforated bags for eight months to reach maturation. Two aerobic composting reactors (silos) were used simultaneously and under the same conditions (air-flow 20 L/h and external ambient temperature 25±2°C). In order to control biotransformation processes, composting was monitored by determining physico-chemical and microbiological parameters. The evolution of the parameters analyzed (temperature, moisture, pH, organic matter, C/N ratio, nitrogen and carbon) during the nine months of composting process demonstrate the stability and maturity of obtained compost. In the system without sawdust material, the maximum temperature was 40°C. However, the mixture sludge/sawdust 75:25 reaches thermophilic conditions with a maximum temperature of about 58°C, thus providing a best degradation. According to germination index, waste activated sludge mixed with the aforementioned carpentry waste provided compost with visibly positive properties for agricultural use. The addition of sawdust to sludge decreases considerably the number of coliforms in compost; this is mainly due to the effect of dilution and to the level of temperature reached.

Annouar S.,Laboratory of Water and Environment | Annouar S.,Laboratory of Analytical Chemistry and Coordination | Moufti A.,Laboratory of Water and Environment | Moufti A.,Regional Center for Careers in Education and Training | And 3 more authors.
Oriental Journal of Chemistry | Year: 2016

To approximate conditions defluoridation groundwater, during this work, we are interested in the study of the influence of the presence of ions-counter on the ability of removing fluoride ions by chitosan. Also we searched the optimal conditions for the desorption using a basic solution. In light of this study, we observed that a NO3 and HCO3 share are the real competitors to the removal of fluoride on chitosan. And secondly, Desorption of fluoride from saturated support is possible and efficient with the addition of NaOH in our optimal desorption conditions.

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