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Adsorption studies on the reduction of COD and color from text
Author :Shamal Sen a,b, Dharm Pal a and Abhinesh Kumar Prajapati *b
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ABSTRACT
This study is an attempt to remove the organic compound present in textile dyeing effluent in form of color and chemical oxygen demand (COD) from treated textile dyeing effluent (TDE) using adsorption. For this work, wheat husk adsorbent (WHA) issuccessfully prepared at laboratory scale by carbonization of wheat husk by a double stage carbonization process include ZnCl2 activation. The experimental work performed to analyze the influence of different operating parameters like adsorbent dose, pH, contact time between adsorbate and adsorbent, particle size, and temperature on COD and color reduction. The results confirmed that maximum color and COD reduction of 90.01% and 86.1%, respectively were achieved at optimum conditions (i.e. at pH 4, temperature 25ºC and WHA dose of 2.5 g/dm3). The kinetic studies have been performed on the basis of varying organic concentrations using pseudo-first order and pseudo-second-order kinetics. Furthermore, pseudo-second order (R2 = 0.99) is found to fit better than pseudo-first order (R2 = 0.97) in term of regression coefficient’s values as evident from the kinetic studies. For the suitability of data observation, adsorption models such as Freundlich and Langmuir were applied for equilibrium studies. Both models were found suitable in this study with R2 = 0.99.
KEYWORD
Chemical oxygen demand, color, adsorption isotherm, kinetic models, wheat husk, ZnCl2 activation