The effect of kraft mill bleach plant effluent composition on the effluent color adsorption rate onto a macroporous adsorbent resin

An experimental macroporous adsorbent/ion exchange resin was used to decolorize bleach plant effluents. The treated effluents were a combination of chlorination and alkali extract streams. A study of the rate mechanism was carried out in order to gain a better understanding of how process variables, namely effluent composition and flow rate, affect adsorption. Regeneration of the adsorbent was also investigated.; Both liquid and solid phase resistances were determined to be important, though a liquid-film control model was adequate to describe the system at low resin saturations. The effective diffusivity was determined to be about {dollar}3times 10sp{lcub}-7{rcub}{dollar}. This model suggests that the molecular weights of the treated effluents, namely the amount of high molecular weight (MW {dollar}>{dollar} 10,000) color bodies greatly affect the mass transfer coefficient.; Using NaOH to regenerate the resin, the effluent streams could be concentrated to 10 times the initial color level.