REMOVAL OF COLOR FROM WASTEWATER OF PULP AND PAPER INDUSTRY

Abstract

Decolorization of Pulp and Paper industry wastewater better known as black liquor using low cost adsorbents is under investigation for many years. Color of black liquor is aesthetically harmful for the environment as it contains certain toxic and xenobiotic compounds. The presentstudy deals with the use of Bagasse Fly Ash (BFA), which is generated_ in sugar mills, as an adsorbent for the removal of color and COD of the wastewater generated in pulp and paper. industry.. Batch experiments have been performed to study the adsorption of color and COD. Characterization of adsorbent has been carried out using various . techniques such as FTIR, SEM, EDAX, TGA etc. The influence of pH, adsorbent dosage, time, temperature was studied in batch method. Adsorption process reveals that the initial -uptake is rapid and equilibrium is .established about in 5 h. • At an optimal condition of pH 4, BFA dose 2g1l. temperature 259C and 5 h -time, color and COD removal was found to be 84.86% and 70.46% respectively. Adsorptive removal of COD by BFA followed second-order kinetics. Equilibrium, data were fitted for Freundlich, Langmuir, Temkins, Redlich-Peterson models to facilitate mathematical modeling. Weber-Morris plot was done to know the intraparticle diffusion.