(181b) Removal and Recovery Of Dye From Paper Machine Efffluents By Continuous Column Method

REMOVAL AND RECOVERY OF DYE FROM PAPER MACHINE EFFFLUENTS BY CONTINUOUS COLUMN METHOD

                                            Mohanty*  P., A.K. Ray and T. Utgata**

Department of Paper Technology

Indian Institute of Technology

Saharanpur, India

*   Ballarpur Industries Ltd., Orissa

** Century Pulp & Paper, Lalkua, Uattar Preadesh.

  ABSTRACT

Various kinds of paper such as colored poster paper,adverstising etc. use dyes and color pigments. These color components are generally non-biodegradable and affect environment severely when goes to the water bodies. Therefore it needs removal of these dyes.  Adsorption of dye on a suitable adsorbent is a plausible alternative of abating colour (dye) pollution from paper machine effluents. Experimental studies have been carried out using Methyl violet and Victoria blue dyes as adsorbates, on adsorbents like bagasse pith, wood meal and crushed bleached pulp. The experiments were performed in both batch as well as continuous adsorber. For batch process parametric effects of particle size, agitation, initial dye concentration, time, and temperature on the rate of dye removal have been investigated. Detailed  results of batch process were reported earlier. Effects of surface mass transfer, intra-particle diffusion  on rate of dye removal were correlated in terms of Schmidt and Sherwood number.

In this present study the result of continuous process are highlighted. Comparative results of batch as well as continuous process are also shown. Overall as well as individual effects of time, temperature  and bed height on dimensionless concentration are mainly studied. The continuous adsorption process are performed for a particular bed height in the range between 3 cm and 11 cm. For each bed height an adsorbate- adsorbent combination is selected and adsorption is carried out  at three different temperature ranges, namely 303 K,318 K and 333K.  For effects of above parameters ,Initial concentration is however kept  at 2 gpl and the particle size of all adsorbates  at 40 mesh.  Confirmatory trial experiment is performed using methyl violet as adsorbate at 1 gpl concentration with wood meal as adsorbent at 303 K-333K.