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Environmental Engineering Research 2002;7(4): 199-206. DOI: https://doi.org/10.4491/eer.2002.7.4.199
DECONTAMINATION OF HEAVY METALS FROM DEWATERED SLUDGE BY Acidithiobacillus ferrooxidans
Am Jang, Hyun-Young Jang, Sung-Min Kim, Jong-Un Lee, and In S. Kim
Bio-Environmental Engineering Lab. (BEEL), Dept. of Environ. Science & Engineering, Kwangju Institute of Science and Technology (K-JIST) Gwangju 500-712, Korea
Corresponding Author: In S. Kim ,Tel: +82-62-970-2436, Fax: +82-62-970-2434, Email: iskim@kjist.ac.kr
Received: December 21, 2001;  Accepted: August 18, 2002.
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ABSTRACT
Abstract: Bioleaching process using Acidithiobacillus ferrooxidans for the removal of heavy metals from dewatered municipal sewage sludge was investigated. Sequential extraction results showed that the heavy metals (Cd, Cu, Ni, Pb and Zn) were associated with exchangeable and carbonate fractions in the dewatered sludge. Short-term (4 days) bioleaching experiments for Zn, Cu and Cd were performed under various process conditions such as initial concentrations of Fe"', sulfur addition and input amount and particle size of the sludge. When lower content of the sludge was added, higher amounts of the metals were extracted into solution. However, higher initial concentration of Fe" , sulfur addition and fine particle size of the sludge did not facilitate the metal extraction during a period of 4 days. Long-term (40 days) leaching study indicated that biolixiviation using this acidophile can be effectively employed in the process of decontamination of heavy metal-laden dewatered sludge.
Keywords: Acidithiobacillus ferrooxidans | bioleaching | dewatered sludge | heavy metals
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