Publications Scientifiques
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Item Reduction of turbidity and chromium content of tannery wastewater by electrocoagulation process(Water Environment Federation, 2018) Ziati, Mounir; Khemmari, Fariza; Aitbara, Adel; Hazourli, SabirThe present study is carried out to remove chromium and turbidity from tannery wastewater using the electrocoagulation process with aluminum electrodes. This experimental study is carried out using a batch system. The applied pilot comprises a reactor containing two parallel metal electrodes (Al). The latter are connected as monopolar, and a different potential is applied between them. Several working parameters, such as applied potential difference, electrolysis time, active electrode surface, interelectrode distance, and the pH of the medium have been studied to achieve higher removal efficiency. The treatment reached a maximum reduction of 99% for turbidity and 93% for chromium under the following conditions: 15 V applied potential difference, 45 cm 2 electrode surface, 1 cm interelectrode distance, pH 6.1 raw water, and a contact time of 90 min. Given the treatment efficiency obtained in this study, electrocoagulation process has the potential to be used for the cost-effective removal of wastewater pollutants.Item Removal of chromium from tannery wastewater by electrosorption on carbon prepared from peach stones : effect of applied potential(2017) Ziati, Mounir; Khemmari, Fariza; Kecir, Mohamed; Hazourli, SabirThe objective of this study is the removal of chromium from tannery wastewater by electrosorption on carbon prepared from lignocellulosic natural residue "peach stones' thermally treated. The followed steps for obtaining coal in chronological order were: cleaning, drying, crushing and finally its carbonization at 900°C. The characterization of the carbon material resulted in properties comparable to those of many coals industrially manufactured. The study of the dynamic adsorption of chromium on the obtained material resulted in a low removal rate (33.7%) without applied potential. The application of negative potentials of -0.7 V and -1.4 increases the adsorption of chromium up to 90% and 96% respectively. Whereas a positive potential of +1.4V allows desorption of the contaminant of 138%Item Effect of chemical treatment of the biomass fongic on the capacity of adsorption of the chromium(European Journal of Scientific Research, 2006) Sahmoune, Mohamed Nasser; Louhab, K.; Addad, J.; Goma, B.Heavy metals are present in different types of industrial effluent, being responsable for environmental pollution. Biosorption by the biomass fungic is a promising alternative method to treat industrial effluents, mainly because of its low cost and high metal binding capacity. In this paper we studied the effect of treatment at different concentration NaOH of the biomass fungic on the caracteristics of the biomass (morphology of the fungic biomass), and the capacity of adsorption of chromium. The analysis of the thermodynamic, the kinetics of adsorption, the spectra of infra-red spectra and the electron micrographs of the M.E.B. watch that these treatments, although resulting in apreciable weight reduction, also enhanced their capacity adsorption for chromium, while increasing the sorption kinetics. © EuroJournals Publishing, Inc. 2006Item Studies of chromium removal from tannery effluents by dead streptomyces rimosus(2008) Sahmoune, Mohamed Nasser; Louhab, Krim; Boukhiar, AissaItem Advanced biosorbents materials for removal of chromium from water and wastewaters(American Institute of Chemical Engineers, 2011) Sahmoune, Mohamed Nasser; Louhab, Krim; Boukhiar, AissaItem Thermodynamic of chromium sorption on biomass fungi from aqueous solution(2006) Louhab, K.; Addad, J.; Barr, S.; Goma, B.The thermodynamics of chromium ions sorption from aqueous solution on biomass fungi have been investigated. The experimental data was analysed by Langmiur and Scatchard isotherms. The equilibrium sorption capacity of chromium ions was determined from Langmiur and Scatchard equation at different temperature. Bad correlation coefficients were obtained for the Langmiur adsorption equilibrium constant. Various thermodynamics parameters, Δ H°ads, Δ S°ads and equilibrium constant values were computed at different temperature. The results show that the sorption of the chromium ions on biomass fungi is spontaneous and exothermic nature process, the thermodynamics parameters are dependent of the temperature and the equilibrium sorption capacityItem Speciation of chromium in bottom ash obtained by the incineration of the leather waste shavings(2006) Louhab, K.; Akssas, H.The evolution of bottom ash morphology and chromium metals behavior during incineration of a leather waste shavings at different incineration temperature have been studied. The Cr, Ca, Mg, Cl rates in bottom ashes, flay ashes and emitted gases in different incineration temperature of the tannery wastes are also determined. The morphology of the bottom ashes obtained by incineration at different temperature from the leather waste shavings was examined by MEB. The result show that the temperature and the length of incineration influence on the structure of the bottom ash and on the chromium in the bottom ashItem 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 Effect of calcium competition on chromium adsorption by fungi biomass(2006) Louhab, K.; Sahmoune, Mohamed Nasser; Addad, J.; Bar, S.The kinetics and thermodynamic of adsorption of a mono-solute of chromium ions and of a bi-solute of chromium and calcium ions by fungi biomass (Streptomycine rimosus) was investigated in a batch system. The experimental data were analyzed based by Langmuir isotherm and a Pseudo second order mechanism, in the both the mono-and bi-solute adsorption systems, in order to predict the rate constant of adsorption, the equilibrium capacity. The results indicate that the adsorption mechanism is described by Langmuir isotherm and a Pseudo-second-order. The equilibrium adsorption capacity and the equilibrium rate constant increased with an increase in the initial chromium concentration in both mono-and bi-solute adsorption systems. The adsorption capacity of chromium decreased with an increase in calcium concentration