Browsing by Author "Hachemi, M."
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Item Application of artificial neural network and kinetic modeling for the prediction of biogas and methane production in anaerobic digestion of several organic wastes(Taylor & Francis, 2021) Mougari, Nour El Islam; Largeau, J. F.; Himrane, N.; Hachemi, M.; Tazerout, M.In the current study, artificial neural network (ANN) and modified Gompertz equation (MG) were applied to develop integrated based models for the prediction of cumulative biogas and methane yield (CBY and CMY) from anaerobic digestion (AD) of several organic wastes. Volatile solid to total solid ratio (VS/TS), carbon content (C), carbon-to-nitrogen ratio (C/N) and digestion time (DT) were selected as input features for the implementation of ANN approach. Genetic algorithm (GA) was employed in order to optimize the ANN architecture as well as the kinetic parameters of the MG to provide reliable and fast learning for better prediction performance. To evaluate model performances, determination coefficient (R2) and root mean square error (RMSE) were used. Both the approaches performed well in predicting CBY and CMY and showed a good agreement with the experimental data. However, GA-ANN models exhibit smaller deviation and higher predictive accuracy with satisfactory RMSE and R2 of about 0.0045 and 0.9996 for CBY, and 0.0046 and 0.9998 for CMY, compared with GA-MG models. This evinces the effectiveness of the developed approach to forecast CBY and CMY and can be an effective tool for the scale up of anaerobic digestion units and technico-economic studiesItem Cesium fluoride on calcium oxide as a strongly basic catalyst. synthesis of flavones and tobacco alkaloids(2003) Villemin, D.; Hachemi, M.CsF on CaO was used as a catalyst in the synthesis of flavones and their derivatives from esters of 2-hydroxyacetophenones and in the synthesis of tobacco alkaloids from aromatic amidesItem Characterization of used engine oil and possibility of recovery(2018) Zerdane, Youghourta; Hachemi, M.; Tazrout, M.; Largeau, Jean-FrançoisThe world today is facing major energy and climate challenges. The growth of global energy demand, the decline in fossil reserves and the dangerous disruption of the climate caused by pollution compels states and scientists to quickly adopt plans strengthened action on renewable energies and the treatment of different types of waste generated by human activity, such as used motor oils in order to preserve the environment and to find other sustainable and economically viable solutions. This work, based on a characterization study of used motor oil, has shown that these characteristics deteriorate after a certain time of use compared to a new oil and that they become polluting due to contamination by inorganic elements (metal). The high calorific value of the used oil can be considered as an important source of energy, hence the need to develop a process for the upgrading of this waste and for this purpose it is envisaged to explore later one of these ways which is pyrolysisItem Combustion effect on the physical, chemical, mineralogical, and microstructural compositions of urban sewage sludge(2018) Benoudjit, Fouzia; Hachemi, M.Item Effect of the sewage sludge ash on the physical and mechanical properties of mortars(2018) Benoudjit, Fouzia; Hachemi, M.Item Elimination Des Métaux Lourds En Vue De La Valorisation Des Boues D'épuration Chimique Des Eaux Usées De Traitement De Surface (cas De Bcr)(Université M'hamed Bougara de Boumerdès/Unité de Recherche-Matériaux, Procédés & Environnement UR-MPE, 2013) Bousalah-boubechiche, Djedjiga; Ait Ahsene-Aissat, F.; Hachemi, M.Lesdéchets solides provenant du traitement chimique de surface et du revêtement des métaux (tels que les boues et gâteaux de filtration contenant des substances dangereuses et autres matériaux), sont considérés comme déchets spéciaux dangereux. L’absence de filières de traitement approprié oblige l’entreprise à stocker ces déchets à l’intérieur du site tout en payant la taxe d’incitation au déstockage conformément à la réglementation Algérienne en vigueur.Pour répondre à cette préoccupation, nous avons tout d’abord procédé à la caractérisation physico-chimique de ces boues, afin de pouvoir apprécier leur teneur en éléments minéraux puis nous avons effectué les essais d’extraction des éléments majeurs par précipitation sélective, dans le but de les réinjecter dans la chaîne de production (valorisation). L’extraction a été efficace pour l’ensemble des métaux (>92%).Item Enhancement of photocatalytic reduction of Cr(VI) using hetero-system NiAl2O4/ZnO under visible light(Aljest, 2019) Bouallouche Née Saadi, Rachida; Kebir, M.; Nasrallah, N.; Hachemi, M.; Amrane, A.; Trari, M.Hexavalent chromium Cr(VI) is well known to be a toxic and non-biodegradable contaminant and can cause significant environmental damage if it is not eliminate from wastewater. However, it can be reduced to Cr(III), which is less toxic by photocatalysis process using the heterosystem NiAl2O4/ZnO. NiAl2O4 prepared by nitrate method crystalize in a spinel structure and was characterized, by XRD, FTIR, and SEM techniques. NiAl2O4 acts as electrons pump and the electron transfer to chromate is mediated via ZnO. Under the optimized conditions, the percentage of Cr(VI) reduction was 62 % for 20 mg/L, NiAl2O4/ZnO ratio (1/1) at pH~3.7 and under visible light. An improvement up to 72% was obtained when the reaction occurs in a Rishton reactor with six bleds after 6 h illumination. It is therefore concluded that the Cr(VI) photocatalytic reduction followed a pseudo first order kinetic model, in agreement with the Langmuir–Hinshelwood mechanism. This work revealed that the NiAl2O4/ZnO heterosystem exhibits a better photocatalytic efficiency for the photoreduction of Cr(VI) mainly due to the good separation of electron-hole pairs (e-/h+) in this combination.Item Evaluation of trace metals in sewage sludge from a wastewater treatment plant with perspective of valorisation(University of M’HAMED Bougara Boumerdes, 2015) Benoudjit, F.; Hachemi, M.The increasing quantities of sewage sludge from wastewater treatment plants are a great source of worry especially concerning their impact on the environment. Managing such sludge is the basis for a successful general sanitation scheme. The present work subject matter is the evaluation of pollutants present in the sewage sludge recovered from urban wastewater treatment plant of the town of Boumerdès, Algeria, which is treated wastewater from three (03) towns: Boumerdes – Corso – Tidjelabine. For this study, we followed the evolution of some physical and chemical parameters such as the concentration of trace metals which we have analysed mineralogically through the use of X-ray fluorescence and then compared to the French standard NF U 44-041. The NF U 44-041 standard concerns the reuse of sewage sludge as fertilizer in land application. Several sewage sludge samples have been analysed in the present work. The analysis of the sewage sludge physical properties has revealed a low percentage of dry matter (total solids) and a high percentage of organic matter. The chemical characterization of the sludge helped to evaluate their pH and polluting power. Overall the pH level of the sludge was approaching neutrality and their concentration in trace metals was below the thresholds defined by the NF U 44-041 standard. Thus, municipal sewage sludge does not represent any danger to the environment that thus can safely be used in agricultureItem Evaluation of trace metals in sewage sludge from a wastewater treatment plant with perspective of valorization(University M'hamed Bougara Boumerdes, 2015) Benoudjit, Fouzia; Hachemi, M.The increasing quantities of sewage suldge from wastewater treatment plants (WWTP) is a great source of worry especially concerning their impact on the environnment. Managing such sludge is the basis for a successful general sanitation scheme. The present work subject matte ris the evaluation of pollutants present in the sewage sludge(SS) recovered from urban wastewater treatment plant of the town of Boumerdes wich is treated wastewater from three(03) towns : Boumerdes- Corso- Tidjelabine, AlgeriaItem Investigate Method to Reduce Methane Emission during Maintenance Operations from Algerian Natural Gas Transportation(2017) Louhibi–Bouiri, Mounia; Hachemi, M.Methane concentration in the atmosphere has critically increased recently, its account for about 50% of the greenhouse gases (GHG) emissions. Increasing environmental concern and global warming have made it become an imminent consideration. The energy sector is the second largest contributor to methane emissions. The emissions of natural gas from gas transportation pipeline are an important factor for global warming. For this article we try find a way for preventing of waste this source because of economical aspect and environmental problems. First we calculate the volume of gas venting from pipeline and then get quantity of money value of this gas then we suggest a mobile compressor for saving this gas. Pipeline pump-down technique with portable compressor solution instead of venting will mainly allow 54.873 million m3 gases saving, which costs about 11.628 million USD and benefits justified purchase of 4 portable compressorsItem Liquid and solid acids as catalysts for the Thiele–Winter reaction of menadione(2000) Villemin, D.; Bar, N.; Hammadi, M.; Hachemi, M.Liquid acid such as perchloric acid, chlorosulfonic or triflic acid can effectively replace sulfuric acid as a catalyst in Thiele–Winter reaction of menadione. Solid acids like zeolites and heteropolyacids are described for the first time as catalysts in Thiele–Winter reaction. The two step sequence (Thiele–Winter), saponification–oxidation) constitutes a new synthesis of the antibiotic phthiocol from menadioneItem Mechanical performance study of mortars containing local sewage sludge ash(2019) Benoudjit, Fouzia; Hachemi, M.The amount of sewage sludge from wastewater treatment plants is continuously increasing and becoming a serious issue for environment. Therefore, the valorisation of sewage sludge in sectors such as the construction field where there is high demand for naturel resources would be great for the environment. The present work reports the possibility of using sewage sludge ash as substitute for cement CEM II/A-P 32.5 R in mortars. Various ratio of sewage sludge ash (10%, 20% and 30%) was used in addition to cement, and mechanical attributes of resulting mortars, were tested at various curing ages and compared with control samples. The obtained results have revealed that sewage sludge ash can be used as a substitute of part of the cement in mortar and. The substitution can be as high as 30% while maintaining a compressive strength within the standard NF EN 197-1 requirements at 28 days.Item New approach of depollution of solid chromium leather waste by the use of organic chelates : economical and envirHachemi Messaoudonmental impacts(2009) Ammar, Mohammed; Hachemi, M.; Didier, V.Herein, we describe an original novel method which allows the decontamination of the chromiumcontaining leather wastes to simplify the recovery of its considerable protein fractions. Organic salts and acids such as potassium oxalate, potassium tartrate, acetic and citric acids were tested for their efficiency to separate the chromium from the leather waste. Our investigation is based on the research of the total reversibility of the tanning process, in order to decontaminate the waste without its previous degradation or digestion. The effect of several influential parameters on the treatment process was also studied. Therefore, the action of chemical agents used in decontamination process seems very interesting. The optimal yield of chromium extraction about 95% is obtained. The aim of the present study is to define a preliminary processing of solid leather waste with two main impacts: Removing with reusing chromium in the tanning process with simple, ecological and economic treatment process and potential valorization of the organic matrix of waste decontaminatedItem PCCD/Fs and BTEXs in the vicinity of an industrial waste incinerator in northern Algeria(Parlar Scientific Publications, 2015) Ahsene-Aissat, F.A.; Moussaoui, Y.; Kerchich, Y.; Guenane, F.; Hachemi, M.Item Reaction in water under microwave: rapid and convenient synthesis of N-hydroxymethylimides and N-hydroxymethyl lactams(Aljest, 2015) Hachemi, M.N-hydroxymethyl imides and N-hydroxymethyl lactams were obtained by the reaction of formaldehyde with imides or lactams in water under microwave irradiation (15 min., 240 W).Item Removal of methylene blue in aqueous solution by oxidation with hydrogen peroxide in presence of copper-impregnated activated alumina(Aljest, 2019) Bousalah, Djedjiga; Yeddou, A. R.; Hachemi, M.; Nadjemi, B.In this work, methylene blue in aqueous solution is removed by oxidation with hydrogen peroxide in the presence of copper impregnated activated alumina. After preparation and characterization of the catalyst, the catalytic oxidation tests are performed. The effects of pH, H2O2 concentration, catalyst dose, and temperature have been investigated. The tests show that adding activated alumina increases significatively the degradation effeciency of methylene blue. The reuse of catalyst for four cycls shows a good catalytic stability. The elevation of the temperature affects positively the kinetics of degradation. The acidified medium increases the decolorization efficiency of dye.Item Solvent-Free condensation of methyl pyridinium and quinolinium salts with aldehydes catalyzed by DBU(2012) Loucif Seiad, Linda; Villemin, D.; Bar, N.; Hachemi, M.Methylpyridinium and methylquinolinium salts were condensed under solvent-free conditions with aromatic aldehydes in the presence of 1,8-diazabicyclo[5.4.]undec-7-ene (DBU) as catalyst, by grinding at room temperature. The products are dyes or useful intermediates. The DBU can be easily recycled and reusedItem Stability analysis of the pitch angle control of large wind turbines using different controller strategies(SAGE, 2022) Bouregba, Hicham; Hachemi, M.; Hachemi, M.; Hamidat, A .Reducing the environmental impact necessitates a boost in renewable energy conversion systems. Wind energy is regarded as one of the most essential energy sources. For this purpose, the high wind variations in the energy conver- sion chain require robust and reliable control. This research aims to implement a regulation based on artificial intelli- gence toward a blade orientation mechanism to improve the stability of energy conversion. On the other hand, an energy maximization technique called Maximum Power Point Tracking (MPPT) is integrated into the control system. A developed program in MATLAB estimates the turbine performance with two different strategies, namely the MPPT tech- nique and the Pitch control mechanism. For the best control and more stability of energy conversion, three artificial intelligence controllers, which are Neuronal Network (PI-ANN), Fuzzy Logic (PI-FLC), and Neuro-Fuzzy (PI-NFLC), were employed. They are compared with the conventional controller (PI-C). This comparison is made to distinguish the most robust regulator against wind speed variations. The different performance indices showed that the controller PI- NFLC has an excellent response, with an Integral Time Absolute Error (ITAE) of 375.28, whereas the Integral Absolute Error (IAE) and Integral Time Square Error (ITSE) equal 13.87 and 406.59, respectively.Item Symmetrical voltages dips analysis in a wind turbine based on DFIG for high power conversion(Springer, 2023) Bouregba, Hicham; Hachemi, M.; Mekhilef, S.; Ratni, A.The most common source of renewable energy generation worldwide is wind turbines (WT) based on doubly-fed induction generators (DFIGs). To keep such sources connected to the grid during outages, low voltage ride-through (LVRT) capacity must be increased. Due to its vulnerability to grid disruptions, it is essential to follow stringent methods to keep DFIG connected to the grid. As a result, this study employs the crowbar resistance protection approach on a practical 2MW to improve WT’s LVRT. Under steady-state and symmetrical grid disturbances, the effectiveness of the DFIG-based WT with crowbar resistance is investigated and compared. The dynamic performance of the proposed scheme is analyzed to that of the existing capacitor bank system using a variety of metrics in order to demonstrate its efficacity. The modeling and simulation tools MATLAB and Simulink are used in this study. The findings reveal that the suggested LVRT capability outperforms the competition in practice