Publications Scientifiques
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Item Assessing the Utilization of Sawdust in Water-Based Drilling Fluid for Managing Fluid Loss and Enhancing Viscosity(Taylor & Francis, 2024) Ysbaa, Saadia; Safi, Brahim; Sid, Asma Nour El Houda; Mhadhbi, Mohsen; Essafi, WafaThe evaluation of the use of sawdust in drilling fluid formulation is covered in this study. The investigation focused on the physicochemical and rheological properties of water-based mud (WBM) drilling fluids that included four different dosages of sawdust. These properties included yield stress, plastic viscosity, rheological behavior, gel strength, filtration test (API filtrate; American Petroleum Institute), and pH. The sawdust was employed as a substitute for the polymers commonly used in water-based muds (WBMs) to serve either as a viscosifier or as a fluid loss controller. The current study set out to evaluate how sawdust (diameter ≤630 µm) affected the primary characteristics of the drilling muds. Sawdust was utilized in place of carboxymethyl cellulose polymer (CMC) as a viscosifier and polyanionic cellulose polymer (PAC) as a filtrate reducer at several dosages (0, 10, 20, 50, and 100 g/L). It was found that the sawdust dosage and its role had a significant impact on the rheological characteristics of the drilling fluids. At amounts between 20 and 50 g/L, the sawdust was added as a viscosifier to the drilling fluids under study, resulting in a significant improvement in their physicochemical and rheological parameters (yield stress, plastic viscosity, and gel strength). However, the drilling fluids showed extremely high rheological properties and a viscosity that can slow down fluid circulation in the well when 100 g/L of sawdust were used, totally substituting for the polymers.Item Equilibrium and Kinetic Modelling of Astrazon Yellow Adsorption by Sawdust: Effect of Important Parameters(2010) Ouazene, Naima; Sahmoune, Mohamed NasserThis paper aims to investigate the sorption of Astrazon yellow (A.Y.) onto sawdust (Aleppo pine tree), a forest waste as that acts as a low-cost adsorbent. In our experiments, the batch sorption is studied with respect to solute concentration, contact time, adsorbent dose, particle size and pH. The adsorption process attains equilibrium within 300 minutes. The extent of dye removal decreased with increasing particle size and increased with increasing contact time, adsorbent dose and pH. The equilibrium data were analysed by the Langmuir and Freundlich isotherms. The characteristic parameters for each isotherm were determined. By considering the experimental results and adsorption models applied in this study, it can be concluded that equilibrium data were represented well by the Langmuir isotherm equation. Maximum adsorption capacity calculated at 293K was 81.8 mg/g. Five kinetic models (pseudo-first order, pseudo-second order, fractional power, Elovich and intraparticle diffusion kinetic equations) were used to predict the adsorption rate constants. The kinetics of adsorption of the basic dye followed both Elovich and pseudo-second order kinetics, and intraparticle diffusion was not the sole rate-controlling step. The effective diffusion of Astrazon yellow in sawdust according to Boyd Model was 24.22 .1012 m2/S. In order to reveal the adsorption characteristic of sawdust samples, SEM and FTIR spectra analyses were carried out. The results show that sawdust (Aleppo pine tree) can be an alternative low-cost adsorbent for removing cationic dyes from wastewater.Item Mass-transfer processes in the adsorption of cationic dye by sawdust(Wiley, 2012) Sahmoune, Mohamed Nasser; Ouazene, NaimaAdsorption kinetic and equilibrium studies of cationic dye namely, Astrazon Yellow (AY) from aqueous solution at various initial dye concentration (15–50 mg/l), pH (2–9), particle size <1600 μm on Aleppo pine-tree sawdust were studied in a batch mode operation. Batch studies revealed that the potential of Aleppo pine-tree sawdust in dye removal was dependant on initial pH and initial dye concentration. In order to select the main rate-limiting step in the overall uptake mechanism, a single external mass transfer diffusion model, Urano and Tachikawa model and intraparticle diffusion model were used. The external mass transfer rate constant β was found to be 8.5 10-5 m-1 at initial concentration 50 mg/l of AY and 1.14 10-4 m-1 at initial concentration 15 mg/l of AY. It was observed multi-linearity in the shape of the intraparticle diffusion plot. The two phases in the intraparticle diffusion plot suggest that the sorption process proceeds by surface sorption and an intraparticle diffusion stage. The effective diffusion coefficients Di were found to be 3.88 10-11 cm2/s and 4.2 10-11 cm2/s for initial concentration of AY of 15 mg/l and 50 mg/l respectively, indicating a poor intraparticle diffusion into Aleppo pine-tree sawdust . AY sorption onto sawdust was mainly located on the surface. The equilibrium isotherms were analysed using the Langmuir, Freundlich, Temkin and Elovich models. It was seen that the sorption data fitted to Langmuir, Freundlich, Temkin and the Elovich isotherms, but they were very well described by the Langmuir model.Item Valorization of sawdust using Biological denirification of synthetic nitrates-contaminated ground water(Research Journal of Chemistry and Environment, 2018) Boumechhour, Fatima; Benbelkacem, Ouerdia; Ben Lefki, Rabah; Berrehal, Ahmed; Asselah, Amal; Benrachedi, Khaled; Bouchemal, NaimaNitrate pollution in receiving waters has become a serious issue worldwide. In Algeria, underground water pollution by nitrates has become alarming. Globally, denitrification is commonly employed in biological nitrogen removal processes to enhance water quality. This research investigated the valorization of a vegetable residue (sawdust) as carbon source and biofilm carrier for denitrification in batch reactor to remove nitrate from synthetic groundwater. Throughout the study, the effects of some important parameters including initial nitrate concentration (50-130 mg/L), amount of carbon source (2-8 g/L) and initial pH (4-11) were studied. The results showed that the system achieved high denitrification; nitrate removal was greater than 99 % after 3 hours of incubation. The nitrite concentration (NO2 -) in the effluent was below 0.030 mg/L. The results also showed an important effect of C/N ratio on the performance of the process.Item Potential of sawdust materials for the removal of dyes and heavy metals : examination of isotherms and kinetics(Taylor and Francis, 2016) Sahmoune, Mohamed Nasser; Yeddou, Ahmed RedaItem Adsorptive removal of phosphate from aqueous solution by chemically modified biosorbent(2012) Benyoucef, S.; Amrani, MoussaItem Removal of phosphate from aqueous solution with modified sawdust(Elsevier, 2012) Benyoucef, Salah; Amrani, MoussaIn the present study, chemically modified Aleppo pine (Pinus halepensis Miller) sawdust was used for removal of phosphate from water. The sawdust preparation process included size fractionation, extraction for surface activation, acid prehydrolysis, and treatment with urea. Sorption of phosphate ions onto the sawdust modified was studied using the batch technique. The effect of different parameters such as contact time, adsorbate concentration, and temperature was investigated. The adsorption kinetics data were best described by the pseudo-second-order rate equation, and equilibrium was achieved after 40 min. The Langmuir and Freundlich equations for describing adsorption equilibrium were applied to data. The constants and correlation coefficients of these isotherm models were calculated and compared. The adsorption isotherms obey the Freundlich equation. The thermodynamic parameters like free energy, enthalpy and entropy changes for the adsorption of phosphate ions have been evaluated and it has been found that the reaction was spontaneous and endothermic in nature. The low value of activated energy of adsorption, 3.088 Kj/mol, indicates that the phosphate ions are easily adsorbed on the sawdust. Results suggest that the prepared chemically modified Aleppo pine sawdust has potential in remediation of contaminated waters by phosphate