Publications Internationales
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Item Impact of earthquake demolition debris on the quality of groundwater(2010) Benmenni, M. S.; Benrachedi, K.Problem statement: Debris from construction or demolition/deconstruction processes have no significant impact on the environment as they are res-usable and inert. This has been also long admitted for solid waste generated by the demolition of damaged cities following violent earthquakes. Approach: This study is a contribution to the assessment of actual impact on the quality of groundwater of buried demolition debris from the city of Boumerdes, in the North of Algeria 5 years after the May 21st 2003 earthquake hit the region. The public discharge of Boumerdes city has been used as a temporary landfill. It is located about 5 km downtown of Boumerdes at the Tidjelabine site which is marly-calcareous formation. Leachate from the landfill was directly rejected in the receiving environment, where the soil is marly-calcareous type with cracks giving a variable permeability (10-2 m sec-1 to nearly 10-6 m sec-1) that facilitates infiltration of potential pollutants to the groundwater. The slope character (from 5-10%) of the field contributes to pollutants movement and may accentuate water quality deterioration. Three domestic wells (designated S1, S2 and S3) were selected in the vicinity of the landfill and served as piezometers. Leachate samples were taken from the landfill and evaluated. Results: Leachate analysis indicated organic matter with relatively high COD (1136 mg L-1 O2) and BOD5 (200 mg L-1 O2); whereas the pH yielded 7.65 thus indicating fermentation phase of the landfill. Heavy metal contents were beyond national standard limits except for Pb with 0.51 mg L-1 which is slightly higher than limit value of 0.5 mg L-1. More than five years after the creation of this landfill and despite its predominant C&D nature, these results showed that it was following a typical urban wastes decomposition scheme. Same analysis carried on water samples drawn from the piezometers yielded following results: acidic pH (6.88), acceptable values of target heavy metals concentrations except for Zn with 0.779 mg L-1. Additionally bacteriological cross analysis (membrane filter and multi-tube methods) showed groundwater contamination by total coliforms (1100/100 mL), fecal coliforms (11/100 mL) and fecal streptococci (1100/100 mL). Conclusion: These results proved that leachate had reached the first aquifer horizon about 10 m beneath soil surface. Prior to any remediation program, Management of Boumerdes Municipality is called to quickly implement a reuse and recycling program of the demolition debris in order to stop water reservoirs contamination sourceItem Chemical production and characterisation of activated carbon from waste 'coffee grounds'(Inderscience Enterprises, 2013) Mekarzia, A.; Namane, A.; Benrachedi, K.; Belhaneche-Bensemra, NaimaItem Removal of malathion from polluted water by adsorption onto chemically activated carbons produced from coffee grounds(2014) Bouchenafa-Saïb, N.; Mekarzia, A.; Bouzid, B.; Mohammedi, O.; Khelifa, A.; Benrachedi, K.; Belhaneche, N.Item Modification des performances des bitumes par incorporation d'un déchet ozonisé à base d'éthylène vinyl-acétate = Improvement of the performance of bitumen by addition of ozonized ethylene vinyl-acetate waste(2007) Benrachedi, K.; Fahimi, A.; Fargere, T.; Delmas, M.; Gaset, A.; Pietrasanta, Y.; Boutevin, B.Cette étude a pour objectif l'amélioration des performances d'un bitume par incorporation d'un déchet de polymère recyclé. La matière de base est un déchet à base d'éthylène vinyl-acétate lequel a subi au préalable une déréticulation par l'ozone en milieu solvant. L'incorporation du déchet ozonisé dans le bitume montre que la température de ramollissement et la pénétrabilité du bitume dépendent des conditions opératoires d'ozonisation. L'étude des facteurs d'ozonisation et de leurs influences sur la température de ramollissement, pénétrabilité et indice de pénétrabilité est réalisée par une matrice de Doehlert. Les résultats expérimentaux obtenus montrent que le bitume modifié a une bonne pénétrabilité ainsi qu'une température de ramollissement relativement élevéeItem Impact of earthquake demolition debris on the quality of groundwater in Boumerdes, Algeria(2011) Benmenni, M.S.; Benrachedi, K.This study is a contribution to the assessment of actual impact on the quality of groundwater of buried demolition debris from the city of Boumerdes, in the North of Algeria 5 years after the May 21st 2003 earthquake hit the region. Leachate analysis indicated organic matter with relatively high COD (1136 mg/L O2) and BOD5 (200 mg/L O2); whereas the pH yielded 7.65 thus indicating fermentation phase of the landfill. Heavy metal contents are beyond national standard limits except for Pb with 0.51 mg/L which is slightly higher than limit value of 0.5 mg/L. More than 5 years after the creation of this landfill and despite its predominant C and D nature, these results showed that it is following a typical urban wastes decomposition scheme. Same analysis carried on water samples drawn from the piezometers yielded following results: acidic pH (6.88), acceptable values of target heavy metals concentrations except for Zn with 0.779 mg/L. Additionally bacteriological cross analysis (membrane filter and multi-tube methods) showed groundwater contamination by total coliforms (1100/100 mL), fecal coliforms (11/100mL) and fecal streptococci (1100/100 mL)Item Impact of debris from demolition of Boumerdes on the quality of groundwater(2010) Benmenni, M.S.; Benrachedi, K.The public discharge of Boumerdes city is at 5 km from downtown at Tidjelabine site and marly-calcareous formation. This formation shows crack porosity that facilitates pollution of groundwater reserves. The slope character of the field also favours the movement of pollutants. Leachates penetrating from the discharge towards the water table result in water quality deterioration. Chemical analysis carried out on samples from three piezometers show large concentration of chromium, zinc and lead, thus confirming the high groundwater deterioration. To assess the degree of pollution caused by this discharge, a comparison with other similar discharge was studied. This shows that the site is ancient of the discharge and is not stabilized yet and an acidic phase of anaerobic degradation is still going on. bacteriogical analysis carried out on groundwater show a microbiological contaminationItem Evaluation of air pollution by heavy metals on bab El Oued zone of Algiers(2010) Belamri, M.; Benrachedi, K.The present study consists in analyzing the quality of the air in the capital. LVS pump (low volume sampler) was used for the collection of the samples in the district of Bab El Oued in Algiers characterized by the presence of a hospital and an incinerator of medical and different other waste as well as a strong density of traffic cars. The aerosols were taken at height of 3 m of the ground in total suspended particulate (TSP) mode. The samples have been analyzed by EDXRF (energy dispersive X-ray fluorescence). The experimental results show that the daily content of TSP are above limit of the target value 50 μg/m3. The TSP are respon-sible for the transport of toxic heavy metals such as Cd, Pb, Cr and NiItem Determination of the adsorption capacity of activated carbon made from coffee grounds by chemical activation with ZnCl2 and H3PO4(2005) Namane, A.; Mekarzia, A.; Benrachedi, K.; Belhaneche-Bensemra, Naima; Hellal, A.In order to evaluate the adsorptive capacities of granular activated carbon produced from coffee grounds by chemical activation, the adsorption of different phenols and acid and basic dyes, has been carried out. The comparison with a commercial activated carbon has been made. Adsorption isotherms of phenols and dyes (acid and basic) onto produced and commercial granular activated carbons were experimentally determined by batch tests. Both Freundlich [1] and Langmuir [2] models are well suited to fit the adsorption isotherm data. As a result, the coffee grounds based activated carbon may be promising for phenol and dye removal from aqueous streamsItem Coupling ultrafiltration with adsorption on activated coffee for use as a reverse osmosis pretreatment(2009) Benrachedi, K.; Bensouali, K.; Houchati, H.The objective of this work was to replace the conventional pretreatment of reverse osmosis by coupling ultrafiltration with adsorption onto activated coffee-like adsorbent material. Adsorption was achieved on activated carbon prepared from a waste of coffee. A protocol of preparation is described as well as a characterization of the activated coffee. Physical and chemical activation was done. The development of a porous texture was proved by scanning electron micrography. A study of adsorption kinetic shows that the new material has a high adsorption capacity. The ultrafiltration–adsorption coupling is a good pretreatment for reverse osmosisItem Biological denitrification heterotrophe of water with fixed biomass using alfa stems as energy source(2010) Belouanas-Benbelkacem, O.; Benrachedi, K.This work presents the results optimization of the biological process denitrification with fixed biomass using a consumable support (Alfa Stem). In the first part, the influence of hydrolyc and volumic load to value the capacity of nitrate purification in a down flow submerged bio filter was analyzed. Then with an experimental design approach, we have analyzed the qualitative and quantitative aspects of the effects of some factors: concentration of nitrate (80-200 mg L-1) and velocity (0.3-1.0 m h-1) on different responses like the apparent rate of denitrification, as well as concentration of nitrite, nitrate and chemical demand on oxygen in the reactor outlet