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Heavy metals uptake mechanisms in a fixed-bed column by calcium-treated anaerobic biomass

Paper ID Volume ID Publish Year Pages File Format Full-Text
36296 45127 2006 12 PDF Available
Title
Heavy metals uptake mechanisms in a fixed-bed column by calcium-treated anaerobic biomass
Abstract

This study investigated the feasibility of using anaerobic granules as a novel type of biosorbent for lead, copper, cadmium, and nickel removal from aqueous solutions using continuous column operation. Calcium treated anaerobic biomass was shown to be highly effective. The average biosorption column capacity for lead, copper, cadmium, and nickel before breakthrough occurred was 1.55, 0.88, 0.89, and 0.51 meq/g, respectively. The removal of Pb2+, Cu2+, Cd2+, and Ni2+ ions from the bed was accompanied by the elution of Ca2+ ions. While the feed pH was 4.0 for the four metals studied, the exit solution pH increased slightly (pH 5.0 to 5.5) for most of the experiments before the breakthrough point. At the breakthrough point, the pH value decreased to the value of the feed solution. The adsorbed metal ions were desorbed from the biomass by feeding into the column a 0.5 M of CaCl2 solution. Ion exchange was identified to be the dominant mechanism for the biosorption of nickel by the anaerobic biomass. For copper and cadmium, 77% and 82% of the total amount adsorbed was attributed to ion exchange, respectively. Eighteen percent and 15% of the total amount adsorbed of copper and cadmium was attributed to a complexation process, respectively. For the case of Pb ions, it was found that ion exchange accounted for almost 50% of the total uptake mechanism. Thirty percent of the total uptake mechanism was attributed to a precipitation mechanism. The remaining 20% was due to complexation. The results of this study indicate that the anaerobic sludge could be used as an effective biosorbent for the removal of heavy metals in a continuous flow system.

Keywords
Biosorption; Continuous wastewater treatment; Fixed-bed column; Heavy metals; Anaerobic granular biomass; Ion exchange
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Heavy metals uptake mechanisms in a fixed-bed column by calcium-treated anaerobic biomass
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 1, January 2006, Pages 187–198
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us