Publications Nationales
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Item An heterotrophic autotrophic denitrification approach for nitrate removal from drinking water by alfa stems(ALJEST, 2022) Benrachedi, Abdellah Lokman; Selatnia, A.; Belouanas, O.; Benrachedi, K.Biological denitrification of drinking water was studiedin up-flow laboratory reactors packed with alfa stems served as the sole carbon source as well as the only physical support for the microorganisms. The highest rates of denitrification were observed in fresh reactors during their first week of operation and the efficiency of the process declined therafter. In the first part, we have analysed the influence ohhydrolyc and volumic load to value the capacity of nitrate prurification in a down flow submerged biofilter then with an experimental design approach, we have analysed the qualitative and quantita-tive aspects of the effects of some factors, concentration of nitrate (80-200 mgl-1 and velocity (0.31 mh-1 on different responses like the apparentrate of denitrification as well as concentration of nitrite, nitrate and chemical demand on oxygen (DCO)in the reactor outlet.Item Flower‑Like Layered Double Hydroxides for the Adsorption of Azocarmine G: Kinetic, Isotherm, and Thermodynamic Studies(Springer, 2023) Meguellati, Zineb; Ghemmi, Naima; Brahimi, RazikaThe current research includes the adsorp- tion behavior of two flower-like layered double hydroxides (MgAl-LDH and MgFe-LDH) synthe- sized via co-precipitation method for the environ- mental remediation. The synthesized materials were characterized by several techniques like X-ray diffrac- tion (XRD), Fourier Transform Infrared spectrom- etry (FTIR), scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), differential ther- mogravimetry (DTG), and differential scanning calo- rimetry (DSC). The materials were also characterized by Brunauer-Emmett-Teller (BET) technique, and the obtained surface areas were 65.50 m2 ·g−1 and 51.43 m2 ·g−1 for MgAl-LDH and MgFe-LDH, respectively. The materials were tested for the adsorption removal of azocarmine G dye from aqueous medium; the experimental parameters, including the pH, the initial concentration, the adsorbent dose, and the time, were optimized to attain a maximum adsorption capacity of 105.9 mg·g−1 and 101.6 mg·g−1 for MgAl-LDH and MgFe-LDH, respectively, which confirms that the materials can be used for the effective dye removal. The kinetic study revealed that the pseudo-second order fitted well the adsorption process, and the iso- therms conformed well to the Langmuir model. The effect of temperature allowed to calculate the follow- ing thermodynamic parameters: ΔHMgAl°=12.083 KJ·mol−1 ; ΔHMgFe°=25.053 KJ·mol−1 ; ΔSMgAl°=43.81 JK−1 ·mol−1 ; and ΔSMgFe°=87.75 JK−1 ·mol−1 .Item Preparation and Characterisation of adsorbent prepared from sewage sludge for removal of methylene blue(ALJEST, 2020) Djoumad, Sonia; Benrachedi, K.; Ladji, H.The objective of this study is to valorize an urban waste, the sludges from the wastewater treatment plant of Boumerdes/Algeria for the removal of methylene blue dye in aqueous solution by adsorption. The material made from this sludge has been characterized by various techniques: X-ray fluorescence microscopy (XRF), X- ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) to obtain information concerning their structures and their compositions.A systematic study of various parameters such as: effect of adsorbent dosage, contact time and initial dye concentration was carried out in order to optimize the ideal conditions for a good adsorption of the studied pollutant; especially the kinetics of adsorption.The exploitation of experimental results using different kinetic models and adsorption isotherms showed that the sludge has similar adsorption characteristics to those of activated carbon, which perfectly confirms the applicability of the activated sludge in the wastewater treatment.Item Medicinal product (Paracetamol) removal by adsorption in aqueous solution; Investigation of kinetic parameters, equilibrium and mass transfer(Technology Publishing Group, 2022) Ouazene, Naima; Belhaneche-Bensemra, N.; Khelifi, A.; Benbatta, A.The adsorption behavior of the medicinal product, paracetamol, using commercial activated carbon in aqueous solution was investigated. In this work, the study of equilibrium, kinetics as well as the idenorder kinetics with R2 = 0.99 for the three studied concentrations. Two mathematical models were tested in order to determine the limiting step of the mass transfer of the paracetification of the mass transfer stages that occur in adsorption were carried out.It was found that the appropriate isotherm model for the equilibrium process was the Langmuir, and the monolayer adsorption capacity was found to be 104.17mg.g-1 at 298 K. The result of the adsorption kinetics shows that the adsorption maximum was reached at 60 min and follows the linear form of the pseudo second tamol adsorption process onto activated carbon. The results showed that the adsorption process was governed by external diffusionItem Continuous flow adsorption of orange acid II by coffee grounds in fixed bed column(University M'hamed Bougara - Boumerdes, 2020) Mahdi, K.; Benrachedi, K.A continuous fixed-bed column study on coffee grounds was carried out at bed depths 0.5-2 cm, flow rates of 0.18-0.53 mL.min-1with initial orange acid II concentrations of 20-100 mg.L-1 at room temperature. The breakthrough time of fixed-bed increased with the increase in bed depth, which permitted orange acid II to diffuse more into the interior of coffee grounds. But decreased with increasing initial concentration, and flow rate.The experimental data were in good agreement with both Thomas and Yoon-Nelson modelsItem Étude de l’adsorption d’un colorant cationique en milieu aqueux sur le charbon actif Issu de la ferula communis(2020) Messabih, S.M.; Benrachedi, K.; Makhlouf, M.; Belaid, K.D.; Bouchher, Omar; Louhab, K.La présente étude est consacrée à la préparation d’un charbon actif en poudre à partir des tiges broyées de la Ferula communis récoltées dans les coteaux de la wilaya de Tipaza au nord de l’Algérie. La matière végétale a été imprégnée à l’acide phosphorique (H 3 PO 4 ), puis carbonisée à 550°C dans un four à moufle. Les résultats obtenus par caractérisation du matériau adsorbant ont montré une importante porosité et une surface spécifique de 1377 m 2 /g. Les applications de l’adsorption du colorant rouge neutre sur le charbon actif, dans un milieu aqueux, ont révélé une capacité d’élimination de l’adsorbat allant jusqu’à 666 mg/g. L’étude thermodynamique a montré que le processus de l’adsorption est spontané et endothermiqueItem Synthesis and Characterization of Algeria Organo clays used for Elimination of Phosphate Anions from Aqueous Solution(Aljest, 2020) Bandou, S.; Amrani, M.; Bouras, O.This study is based on synthesis and characterization of three different clays (Sodic-bentonite noted 𝑁𝑎−𝐵𝑡 , Dialyl Dimethyl Ammonium Chloride-bentonite noted 𝐷𝐷𝑀𝐴−𝐵𝑡 and bentonite intercalated by Hexadecyl Trimethyl Ammonium Bromide or 𝐻𝐷𝑇𝑀𝐴−𝐵𝑡 .These three clay complexes were characterized by both 𝑋𝑟𝑎𝑦 diffraction (𝑋𝑅𝐷) and Fluorescence (𝑋𝑅𝐹)Scanning Electron Microscopy (𝑆𝐸𝑀), Fourier transform infrared spectroscopy (𝐹𝑇𝐼𝑅),textural measurements (𝐵𝐸𝑇 specific surface areas and porosities) and the cationic exchange capacity (𝐶𝐸𝐶). Corresponding obtained results confirm the good intercalation of the 𝑁𝑎−𝐵𝑡 by the two used surfactants at low concentrations ( 0.006𝑀 for 𝐻𝐷𝑇𝑀𝐴𝐵 and 0.007𝑀for 𝐷𝐷𝑀𝐴+). Obtained results give basal spacing values around 14.5 and 18.5𝐴 , respectively for verified two aims firstly: The originality of this research, secondly for minimized the production cost of the adsorbents. Adsorption kinetic study of phosphate ions (𝑃𝑂43−) on these three matrices was carried out using kinetic models of pseudo-first, pseudo-second-order and intraparticular diffusion. Results obtained at the studied conditions (room temperature 𝑇=25𝑜𝐶 ), ( acidic medium 𝑝𝐻=5.7) show clearly the good validity of the pseudo-second-order model which gives a better correlation coefficient both, for 𝐷𝐷𝑀𝐴−𝐵𝑡 (𝑅2=0.995) and 𝐻𝐷𝑇𝑀𝐴−𝐵𝑡 (𝑅2=0.999) compared to that obtained by 𝑁𝑎−𝐵𝑡 (𝑅2=0.990)The aim of this present study was to evaluate the feasibility of using chicken eggshells as low-cost biosorbentfor nickel(II) ions adsorption from aqueous solutions. In order to clarify the adsorption process, batch experiments were performed to study the effect of operating parameters such asbiosorbent dose (1-10 g/L), initial concentration of nickel ions (10-50 mg/L), contact time (5-120 min) and temperature (20-50 °C). To describe the adsorption equilibrium, the experimental data were analyzed by the Langmuir, Freundlich and Temkin isotherm models. The Freundlich model showed better representation of data (R2> 0.999).The maximum adsorption capacity Adsorption isotherms give adsorbed amounts of about 33 and 63 𝑚𝑔.𝑔−1 onto 𝐷𝐷𝑀𝐴−𝐵𝑡 𝐻𝐷𝐷𝑀𝐴−𝐵𝑡 complexes, respectively, and 14 𝑚𝑔.𝑔−1for 𝑁𝑎−𝐵𝑡 as reference adsorbent. These results indicated the adsorption of phosphate anions (𝑃𝑂43−) by the two