Department of Chemical Engineering, National Institute of Technology Raipur, Raipur-492 001, Chhattisgarh, India Department of Chemical Engineering, Institute of Engineering and Science, Indore-452 001, Madhya Pradesh, India E-mail: abhineshgtk@gmail.com Manuscript received online 30 March 2020, accepted 15 June 2020 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

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... E) using adsorption. For this work, wheat husk adsorbent (WHA) is successfully 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.