http://archives.univ-biskra.dz/handle/123456789/38 2026-04-09T23:24:02Z http://archives.univ-biskra.dz/handle/123456789/103 Titre: ELIMINATION DES SUBSTANCES HUMIQUES DE DEUX EAUX DE SURFACE ALGÉRIENNES PAR ADSORPTION SUR CHARBON ACTIF ET SUR BENTONITE Auteur(s): GUERGAZI, S; AMIMEUR, D; ACHOUR, S Résumé: The aim of this work is to study the capacity of different adsorbents in the retention of humic substances contained in natural water dams of Tichy Haff and Kherrata. These two dams are located in Bejaia region (North of Algeria). Our choice was made on the powdered activated carbon (PAC), the granular activated carbon (GAC) and two raw bentonites from Mostaghanem and Maghnia (West of Algeria). The adsorption kinetics showed that the equilibrium is attained during a contact time ranging from 10 to 30 minutes. The variation of doses of adsorbents showed the good elimination yields of humic substances of surface waters tested and obtained for low mass of adsorbent between 10 and 20 mg. 2013-12-23T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/102 Titre: INFLUENCE DE PARAMETRES REACTIONNELS SUR LA STOECHIOMETRIE SULFATE D’ALUMINIUM/ACIDE PYROMELLITIQUE EN EAU DISTILLEE Auteur(s): BACHA, N; ACHOUR, S Résumé: The objective of this study was to evaluate the influence of various reaction parameters on the stoichiometric coagulant dosage / organic matter during coagulation-flocculation with aluminum sulphate. Jar tests were carried out on pyromellitic acid dissolved in distilled water. The results indicate that the effectiveness of the method and dosage of coagulant depends on the pH of the dilution and the initial concentration of the organic compound. The predominant mechanisms in the process were complexation or ligand exchange with insoluble or soluble aluminum species. Highlighting a stoichiometry of reactions showed that the laws linking the dosage of coagulant to initial concentration of pyromellitic acid depended mainly pH in distilled water. 2013-12-23T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/101 Titre: VULNERABILITE DE LA LAGUNE TAMELAHT(BEJAIA) FACE AU DEVELOPPEMENT DES CYANOBACTERIES Auteur(s): DEHBI ZEBBOUDJ, A; DJOUAD, S; SAYAD, A; AIT MEZIANE, H Résumé: The lagoon Tamelaht is one of the few wetlands Bejaia (Northeast Algeria) with multiple roles. It contains a considerable flora and fauna and is a required field transition path for many species of aquatic birds that come to feed and rest before continuing their migration south. Located near the airport and 80 meters from the Mediterranean, it is subject and continuously to various disturbances due to increasing anthropogenic activities. This work is a contribution to the physico-chemical characterization of waters of the lagoon to determine its evolution in terms of pollution and update its algal flora already started before. Analyzes of water samples from the lagoon have identified thirty genera belonging to four classes systematic Cyanophyceae (Cyanobacteria), Chlorophyceae, Diatomophyceae and Euglenophyceae. These algae grow in alkaline waters, sufficiently oxygenated and with enough nutrients. Despite its small area, the lagoon Tamelaht is an ecosystem of great ecological interest. However, it is threatened by various disturbing factors (noise, liquid waste, solid waste, pasture,…). These disturbances weaken the middle more every day. 2013-12-23T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/100 Titre: CONTRIBUTION DE L’HYDRAULIQUE MEDIEVALE DANS LA DYNAMIQUE URBAINE DU MAGHREB. CAS DE LA MEDINA DE TLEMCEN EN ALGERIE Auteur(s): BENSLIMANE, M; SEDDINI, A; HAMIMED, A Résumé: In the mass of literature on the history of Tlemcen, the section reserved for water and medieval hydraulic techniques remains, despite the efforts made, very limited or marginalized. Of course, the socio-economic dynamics of cities requires communities to not fold on the past, but in our case the wealth of material and immaterial heritage is undeniable. A diagnosis of present and look to the future can only be truly achieved only by the appreciation of the knowledge of the past and its integration into the socio-economic and cultural daily. In this perspective of reconciliation between past and present, the issue of water in the ancient medieval cities in general and more specifically that relating to hydraulic systems deserves special attention and urgent care. To better understand this problem, a return to the memory is imperative. He calls us to more than one way to analyze more deeply the evolution of water and its role in medieval urban dynamics of ancient cities. Nearest to us, the Maghreb region offers a variety of examples in which common elements are aridity, water and man. With this modest contribution, the aim is to enrich the debate around this topic of current and vital to our society. For this purpose, a living examples that challenges us by its technical perfection, its sociological context, historical and environmental system is that supply and wastewater in the Medina of Tlemcen.The analysis on the particular system wastewater, known locally as "sloukia" is a testimony to our sense innovations Arabic school water derived from the ingenious technique of exploration and transportation of water of qanat. Currently facing unprecedented degradation, this heritage is threatened with ruin and largely destabilizes the structure of the built heritage and architecture. 2013-12-23T00:00:00Z