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Bioleaching of heavy metals from sewage sludge by Acidithiobacillus thiooxidans—a comparative study

  • SOILS, SEC 3 · REMEDIATION AND MANAGEMENT OF CONTAMINATED OR DEGRADED LANDS · RESEARCH ARTICLE
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Abstract

Purpose

To understand the bioleaching of metals from sludge by Acidithiobacillus thiooxidans, the aims of this study were to evaluate the experimental conditions affecting the efficiency of removal of the metals, including solids concentration, initial pH, sulfur concentration and inoculum level were examined, and following the bioleaching mechanism was proposed.

Materials and methods

A. thiooxidans were isolated from collected sludge samples containing bacteria from Fuzhou Jingshan sewage treatment plant, and identification of bacteria by sequencing the 16 s rDNA gene sequences. Conditions affecting the bioleaching and application were conducted by batch experiments. The analysis of Cr, Cu, Pb, and Zn was carried out using an atomic absorption spectrophotometer, and the pH and oxidation–reduction potential (ORP) were measured using a pH meter and an ORP meter.

Results and discussion

The results show that a high metal leaching efficiency was achieved at low solid concentrations due to decreases in buffering capacity. In addition, the best conditions of the bioleaching included 2 % (w/v) solid concentration, 5.0 gL−1 sulfur concentration, and 10 % (v/v) inoculum concentration, where the removal efficiencies of Cr, Cu, Pb, and Zn in sewage sludge was 43.6 %, 96.2 %, 41.6 %, and 96.5 %, respectively.

Conclusions

We found that the bioleaching of Zn was governed by direct and indirect mechanisms, while the bioleaching of Cu, Pb, and Cr was mainly dominated by the bioleaching indirect mechanism. After processing with the proposed techniques, the heavy metals in the sewage sludge did meet the requirement of the national standards.

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Acknowledgments

The authors sincerely thank Fujian Normal University for financial support through the “Min-Jiang Fellowship.”

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, People’s Republic of China

    Ye-Ming Wen, Qing-Ping Wang & Zu-Liang Chen

  2. Department of Agricultural Sciences, La Trobe University, Bundoora, Melbourne, VIC, 3086, Australia

    Caixian Tang

Authors
  1. Ye-Ming Wen
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  2. Qing-Ping Wang
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  3. Caixian Tang
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  4. Zu-Liang Chen
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Corresponding author

Correspondence to Zu-Liang Chen.

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Responsible editor: Bernd Markert

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Wen, YM., Wang, QP., Tang, C. et al. Bioleaching of heavy metals from sewage sludge by Acidithiobacillus thiooxidans—a comparative study. J Soils Sediments 12, 900–908 (2012). https://doi.org/10.1007/s11368-012-0520-2

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  • DOI: https://doi.org/10.1007/s11368-012-0520-2

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