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   Adsorption of Cd(Ii) By Dried Activated Sludge  
   
نویسنده Khosravan A. ,Lashkari B.
منبع Iranian Journal Of Chemical Engineering - 2011 - دوره : 8 - شماره : 2 - صفحه:41 -56
چکیده    The biosorption of cd(ii) ions from aqueous solutions by dried activated sludge was investigated as a function of initial ph, initial cadmium ion concentration, adsorbent mass, adsorbent particle size and temperature. biosorption experiments were performed using activated sludge of the systems of wastewater refining of milk factory. the results showed that increasing the initial ph from 2 to 5.5 and the adsorbent mass from 0.5g to 2g increased the removal efficiency from 11% to 68% and 68% to 79% respectively. increasing the adsorbent particle sizes from smaller than 0.063mm to greater than 0.5mm and the initial cadmium ion concentration from 15ppm to 120ppm decreased the removal efficiency from 77% to 67% and 80% to 54% respectively. the equilibrium data fitted both the langmuir and freundlich adsorption models, but the freundlich isotherm was found to fit the experimental data slightly better than the langmuir isotherm. the characteristic parameters for each isotherm have been determined. maximum adsorption capacity (q0) was calculated at different temperatures (303, 318, and 333 k) 1.283, 1.581 and 1.726 mg/g, respectively. the dimensionless separation factor (rl) showed that the activated sludge of milk factory can be used for the removal of cadmium ions from aqueous solutions. the results (n, rl) represented good and favorable adsorption. therefore, the activated sludge could remove cd(ii) ions effectively from aqueous solution.
کلیدواژه Biosorption ,Adsorption Isotherm ,Heavy Metal ,Activated Sludge ,Industrial Wastewater
آدرس International Center For Science, High Technology & Environmental Sciences
پست الکترونیکی khosravanfm@yahoo.com
 
     
   
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