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Articles by Gholamreza Nabi Bidhendi
Total Records ( 3 ) for Gholamreza Nabi Bidhendi
  Gholamreza Nabi Bidhendi , Ali Daryabeigi Zand , Alireza Mikaeili Tabrizi , Hamid Pezeshk and Akbar Baghvand
  In the present research, the influence of a deposit control additive on NOx emissions from two types of gasoline engine vehicles i.e., Peykan (base on Hillman) and Pride (South Korea Kia motors) was studied. Exhaust NOx emissions were measured in to stages, before decarbonization process and after that. Statistical analysis was conducted on the measurement results. Results showed that NOx emissions from Peykans increased 0.28% and NOx emissions from Pride automobiles decreased 6.18% on average, due to the elimination of engine deposits. The observed variations were not statistically and practically significant. The results indicated that making use of detergent additives is not an effective way to reduce the exhaust NOx emissions from gasoline engine vehicles.
  Gholamreza Nabi Bidhendi and Touraj Nasrabadi
  In laboratory-scale experiments, rejection-flux curves of four different commercial membranes were established for four different model solutions (NaCl, CaCl2) and (NaCl + CaCl2) and for Ultrafiltration (UF) whey-permeate (pH = 4.6). The results indicated that the salt transport through all the NF membranes investigated depends on the flux. At low flux, when the contribution of diffusive transport is the most important, permeability of (specially monovalent) cations is high. At high flux, when transport by convection is the most important, rejection reaches a maximum (constant) value. From this it follows that the salt transport can be controlled by the flux. The parameters derived from the results with UF-whey permeate can be used to predict the salt rejection for similar multi-component systems like whey and UF-permeate in industrial systems.
  Reza Fouladi Fard , Gholamreza Nabi Bidhendi and Ali Akbar Azimi
  In the present study, the biosorption of nickel ions from aqueous solutions by powder of waste activated sludge was studied. The effect of contact time, pH and shaking rate were investigated. Pseudo-second-order model described the biosorption kinetics better than the Lagergren model. Kinetic experiments showed that nickel concentrations reached equilibrium within 2 h. We found that the biosorptive capacities were dependent on nickel solution pH, with pH 4 being optimal. The influence of the shaking rate on the biosorption capacity of the biomass shows that an optimum value can be obtained between 150 to 250 rpm. The Langmuir isotherm model was applied to experimental equilibrium data of nickel biosorption. The result showed that maximum nickel adsorption capacity of powder of waste activated sludge (qmax) was 11.442 mg g-1 and the Langmuir constant (kd) was 13.9611 mg L-1.
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