Equilibrium and Kinetic Studies of Adsorption Organic Compounds of Vinasse onto Granular Activated Carbon

Document Type : Research Article


1 Dept. of environmental engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Department of Environmental, College of Environment, Alborz, Karaj, Iran


Distilleries wastewater (vinasse) because of its pollution problems is serious environmental concern. In this study the  equilibrium and kinetic studies of adsorption organic compounds of vinasse onto granular activated carbon was  investigated. In order to determine the effect of initial COD (Chemical Oxygen Demand) concentration on the adsorption  effciency, different COD concentrations with granular activated carbon (GAC) dosage of 50 g/l were tested. The COD removal trends for different concentration vinasse solution was investigated at different initial concentration, pH=2 and temperature of 25 °C. The ultimate or equilibrium concentrations were determined for all initial COD concentration.
The q
e values for different COD concentrations of 1957, 3391, 5222, 6558 and 8975 mg/l were found to be 29.3, 46.2, 50.6, 58 and 68.1 mg/g, respectively. An increase in qe was obtained by increasing initial COD concentration, indicating selective nature of GAC in particular organic matters. Equilibrium qe values of fve initial COD concentrations that were ftted by isotherm models. Both Freundlich (R2= 0.983) and Langmuir (R2 = 0.976) isotherms give a good correlation for GAC adsorption of total organic maters in terms of R2 values, however it is slightly higher in Freundlich model and Temkin
model demonstrated a low ftness (R
2=0.92). The maximum adsorption capacity of GAC (qm) predicted by Langmuir model was 71.14 mg/g. The empirical value of qe in our study was 68.1 mg/g with a good vicinity to predicted value by Langmuir isotherm model (71.149 mg/g).


Main Subjects

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