Publications Nationales
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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 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 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 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 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 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, Algeria