Use of thermally treated waste biological sludge as dye absorbent
Resource
Advances in Environmental Research 7 (3): 739-744
Journal
Advances in Environmental Research
Journal Volume
7
Journal Issue
3
Pages
739-744
Date Issued
2003
Date
2003
Author(s)
Abstract
The capacity of adsorbent recycled from microwave thermal treatment to remove a synthetic dye, Rhodamine 6G, from a water bath, was examined. The acidified, dewatered sludge was microwave heated for 1-4 min. Batch adsorption tests were conducted on this sludge at various pH values and solution temperatures. Equilibrium of dye adsorption was obtained in 30 h. Three kinetic models-pseudo first-order, pseudo second-order and intra-particle diffusion-were applied to elucidate the adsorption kinetic data. Experimental results indicate that higher adsorption efficiency could be derived at higher pH/temperature levels. Moreover, the sample treated for 1 min by microwaves adsorbed more dye than did the sample so treated for 4 min. Sludge samples were also characterized to interpret the experimental findings. Energy cost analysis demonstrated the feasibility of the present microwave process. © 2002 Elsevier Science Ltd. All rights reserved.
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journal article
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