Browsing by Author "Amrani, Moussa"

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    Biogas production from waste activated sludge using cattle dung inoculums : effect of total solid contents and kinetics study
    (Elsevier, 2014) Maamri, Sarra; Amrani, Moussa
    Thermophilic anaerobic digestion of waste activated sludge (WAS) was experimentally studied in this research. WAS using cattle dung inoculums with total solids (TS) concentrations of 12.02, 17.58, 23.28, 26.75, and 35.2 g L-1 were digested anaerobically in a batch digester at thermophilic temperatures (55 C°) for a retention period of 15days. Effect of TS concentration on the quality and quantity of the produced gas, pH variation, and the kinetics of biogas production were investigated. The results showed that biogas production potential and biogas production rate increased with an increasing TS concentration. The maximum biogas yields from TS concentration 12.02, 17.58, 23.28, 26.75, and 35.2 g L-1 were 0.186, 0.189, 0.93, 0.213, and 0.231 L/(g VS)-1, respectively. Modified Gompertz equation was employed to model the biogas production at different substrate concentrations. The equation gave a good approximation of the maximum biogas production (Rm) and the biogas yield potential (P) with correlation coefficient (R2) over 0.996. The digestion at TS concentration 35, 8 g L-1 gave the best results. The maximum biogas production reaches 0.856 L day-1, and the biogas yield was 6.650 L at the end of the 13th day of the experiment. This amount of biogas with composition 72.59% of CH4, and 23.6% of CO2 is equivalent to 190 KWh of electricity. These results show that WAS mixed with cow dung is an effective feedstock for biogas production, giving a high cumulative biogas yield
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    Chromium (VI) adsorption onto activated kraft lignin produced from alfa grass (Stipa tenacissima)
    (2009) Tazrouti, N.; Amrani, Moussa
    Activated lignin having a surface area of 1023 m 2 g -1 has been prepared from sulfate lignin that was treated by 30% H 2O 2 and carbonized at 300 oC in order to test the chromium (VI) adsorption from aqueous solution. The influence of contact time, pH, initial concentrations of adsorbent and adsorbate, and temperature on the adsorption capacity were investigated. The maximum removal of Cr(VI) was found to be 92.36 % at pH=2 and a contact time of 80 min. Optimal concentration of lignin and Cr(VI) were found to be 3.8 g L -1 and 180 mg L -1, respectively. The adsorption kinetics data fitted well with a pseudo-second-order equation, and the rate of removal of chromium was found to speed up with increasing temperature. Activation energy for the adsorption process was found to be 18.19 kJ mol -1. The Langmuir and Freundlich adsorption isotherm models were applied to describe the isotherm and isotherm constants for the adsorption of Cr (VI) on lignin. These constants and correlation coefficients of the isotherm models were calculated and compared. Results indicated that Cr (VI) uptake could be described by the Langmuir adsorption model. The maximum adsorption capacity (q m) of Cr (VI) on lignin was 75.75 mg g -1 at 40°C. The dimensionless equilibrium parameter (R L) signified a favorable adsorption of Cr (VI) on lignin and was found to be between 0.0601 and 0.818 (0
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    Elemental chlorine-free bleaching halfa pulp
    (Elsevier, 2010) Bouiri, Baya; Amrani, Moussa
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    Elemental chlorine-free delignification of kraft pulp produced from halfa (stipa tenacissima)
    (2011) Bouiri, Baya; Amrani, Moussa
    Halfa, also known as Stipa tenacissima, is grown in North Africa and south Spain. Due to its short fibre length, paper from halfa retains its bulk and takes block letters well. In this study halfa was evaluated for bleached pulp production. Two cellulose pulps with different chemical compositions were pulped by the conventional Kraft process. One from original halfa material and the other from halfa pretreated by diluted acid. The pulp produced from halfa pretreated with diluted acid was bleached by elemental-chlorine-free sequences DEPD and DEDP. The yield, Kappa number, brightness and α-cellulose content of the bleached and unbleached pulps were evaluated. The results show that during the chemical pulping process, the treated halfa cooked more easily than the original halfa. The treated halfa pulp also showed very good bleaching, reaching a brightness level of 94.8% ISO, a yield of 93.6% and α-cellulose content of 96.8% with the DEDP bleaching sequence as compared to an 83.2% ISO brightness level, 92.8% yield and 95.1% α-cellulose content for pulp bleached with the DEPD bleaching sequence. On the other hand, the physicalmechanical properties of the pulp were not notably reduced by the bleaching process. The breaking length, tear and burst index of the paper sheets were acceptable. Therefore, the halfa material could constitute a worthwhile choice for cellulosic fiber supply
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    Optimization of biolipids production from Saccharomyces cerevisiae ATCC 9763 cultivated on Ampelodesmos mauritanicus (Diss) hydrolysate
    (Springer Nature, 2024) Chenah, May; Amrani, Moussa; Belaloui, Djahida; Youyou, Soraya
    This study focuses on the production of biolipids by fermentation of the yeast Saccharomyces cerevisiae ATCC 9763 on a hydrolysate of the lignocellulosic biomass of Ampelodesmos mauritanicus (Diss). The central composite design (CCD) experimental plan was used to optimize biolipids production under the following experimental conditions: the concentration of dry yeast which varied from 3 to 12 g/L, the concentration of reducing sugars in the hydrolysate (glucose equivalent) was between 6 and 20 g/L, the C/N ratio varied from 40 to 180, and the fermentation time varied from 8 to 24 h. The optimal biolipid results were 49% obtained under conditions of 3 g/L of yeast concentration, 20 g/L of glucose concentration, 180 of C/N ratio, and 24 h of fermentation time. Biolipids were characterized by gas chromatography coupled with mass spectrometry (CG/MS) and the lipid profile revealed that palmitic fatty acid is the major component produced by yeast at a level of 48.49% followed by stearic fatty acid with a level of 43.65%; this fatty acid composition is similar to that of some vegetable oils. The promising potential of lignocellulosic biomass as a fermentation medium for Saccharomyces cerevisiae ATCC 9763 to produce fatty acids and other value-added compounds has been demonstrated and the produced biolipids are a promising feedstock for biodiesel. Graphical abstract: (Figure presented.)
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    Production of dissolving grade pulp from alfa
    (2010) Bouiri, Baya; Amrani, Moussa
    Alfa, also known as Stipa tenacissimaI or "halfa", is grown in North Africa and south Spain. Due to its short fiber length, paper made from alfa pulp retains bulk and takes block letters well. In this study alfa was evaluated for bleached pulp production. Two cellulose pulps with different chemical compositions were pulped by a conventional kraft process. One sample was taken from the original alfa material and another from alfa that had been pretreated by diluted acid. The pulp produced from the pretreated alfa was bleached by the elemental-chlorine-free sequences DEPD and DEDP. The yield, Kappa number, brightness, and α-cellulose content of bleached and unbleached pulps were evaluated. The results showed that during the chemical pulping process, treated alfa cooked more easily than the original alfa. The treated alfa pulp also showed very good bleaching, reaching a brightness level of 94.8% ISO with a yield of 93.6% at an α-cellulose content 96.8(%) with a DEDP bleaching sequence, compared to 83.2% ISO brightness level, 92.8% yield, and 95.1% α-cellulose content for bleached pulp with a DEPD bleaching sequence. Therefore, this alfa material could be considered as a worthwhile choice for cellulosic fiber supply
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    Removal of phosphate from aqueous solution with modified sawdust
    (Elsevier, 2012) Benyoucef, Salah; Amrani, Moussa
    In 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
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    Removal of phosphorus from aqueous solutions using chemically modified sawdust of Aleppo pine (Pinus halepensis Miller) : kinetics and isotherm studies
    (Springer, 2011) Benyoucef, Salah; Amrani, Moussa
    In the present study, chemically modified Aleppo pine (Pinus halepensis Miller) sawdust was used for the removal of phosphate from water. Biosorbent preparation process included size fractionation, extraction for surface activation, acid prehydrolysis, and treatment with urea. Sorption of phosphate ions onto biosorbent 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 and 80 min for modified and unmodified sawdust, respectively. 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, 3.088–3.540 kJ mol-1, 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
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    Valorisation du Diss (Ampelodesmos mauritanicus) pour la lutte contre l’eutrophisation
    (Université M'Hamed Bougara Boumerdes : Faculté des Sciences, 2022) Benhathat, Amal; Amrani, Moussa
    Les eaux usées sont très souvent enrichies en phosphates issus des activités anthropiques, leur rejet dans le milieu naturel sans traitement adéquat entraîne une eutrophisation rapide du réseau hydrographique de surface. Cela a suscité un grand intérêt pour la recherche de nouvelles méthodes écologiques, rentables et efficaces pour assainir les eaux polluées. L'objectif de ce travail est ; de mettre en évidence le potentiel des tiges d’Ampelodesmos mauritanicus connue sous le nom du Diss en évaluant leur utilisation comme précurseur pour la production de charbon actif (AMSAC) et aussi de caractériser et d'évaluer les performances du charbon actif synthétisé pour l’élimination par adsorption des ions phosphates dans une solution aqueuse synthétique. Le charbon actif a été produit par activation à l'acide phosphorique (H 3 PO 4 ) suivie d'une carbonisation sous atmosphère inerte. L’effet des paramètres réactionnels influant l’adsorption tels que le temps de contact, le pH initial de la solution polluante ainsi que de la concentration initiale en phosphate a été étudiée et l’application des modèles de la cinétique et de l’équilibre d’adsorption a été détaillée. Les résultats obtenus démontrent que la température de pyrolyse, le temps de pyrolyse ainsi que la concentration en agent activant impactent les caractéristiques des charbons. Dans les conditions d'activation optimisées par la méthodologie de surface de réponse, les charbons actifs préparés ont des surfaces spécifiques S BET allant jusqu'à 1294 m²/g avec une texture essentiellement micro et méso poreuse. Les résultats ont révélé une cinétique d'adsorption de pseudo-second-ordre atteignant l'équilibre après 75 min environ. Le modèle de Langmuir semble le mieux adapté aux données expérimentales ; La capacité de sorption monocouche de l'AMSAC pour les ions PO 4 -3 a été déterminée à 4,52 mg/g à 25°C. Les paramètres thermodynamiques indiquent que le processus d'adsorption est exothermique. A terme, ce travail permettra de valoriser des matériaux lignocellulosique (Diss) pour la production de Charbon actif (AMSAC), un adsorbant de phosphate prometteur à faible coût.