Effects of Energy Source Concentration on Bioleaching of Heavy Metals from Undigested Sewage Sludge by Using Iron-Oxidizing Bacterium
Publication: Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management
Volume 12, Issue 3
Abstract
The objective of the present study was to optimize the energy source addition required for bioleaching of heavy metals from undigested sewage sludge after secondary treatment. Bioleaching was conducted in a batch system with both inoculation of iron-oxidizing bacteria and the addition of in the range of . The results showed that the pH of the sludge decreased with an increase in the ferrous iron concentrations and reached the maximum acidity of pH 2.1–3.0 for treatments receiving both bacterial inoculation and substrate addition. This led to a significant solubilization of metals from the solids fraction of sewage sludge. However, solubilization behavior differed for different metal species. Solubilization of Zn was not affected by the concentration of the substrate in the range of , whereas solubilization of Cu and Cr was highly dependent on substrate concentration. After 10 days of bioleaching the following heavy metal solubilization efficiencies were obtained: Zn 100%, Cu 83–98%, and Cr 9–75%. In contrast, no obvious solubilization of Cu and Cr occurred except that less than 20% of Zn was leached out in the control without substrate addition. The result from the present study showed that of substrate was sufficient to provide an optimum bioleaching condition. However, the biomass reduction rate was far below the criteria for sludge stabilization and thus, a further stabilization process is necessary prior to land application of the bioleached sludge.
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Acknowledgments
The work described in this paper was supported by the National Natural Science Foundation of China (Project No. NNSFC50778089).
References
American Public Health Association (APHA). (1985). Standard methods for examination of water and wastewater, 17th Ed., Washington, D.C.
Blais, J. F., Tyagi, R. D., and Auclair, J. C. (1993). “Metals removal from sewage sludge by indigenous iron-oxidizing bacteria.” J. Environ. Sci. Health, Part A: Toxic/Hazard. Subst. Environ. Eng., 28(2), 443–467.
Fang, M., Wong, J. W. C., Ma, K. K., and Wong, M. H. (1999). “Co-composting of sewage sludge and coal fly ash: Nutrient transformations.” Bioresour. Technol., 67(1), 19–24.
Gu, X. Y., and Wong, J. W. C. (2004). “Characterization of an indigenous iron-oxidizing bacteria and its effectiveness in bioleaching of heavy metals from anaerobically digested sludge.” Environ. Technol., 25(8), 889–897.
Lombardi, A. T., and Garcia, O., Jr. (1999). “An evaluation into the potential of biological processing for the removal of metals from sewage sludge.” Crit. Rev. Microbiol., 25(4), 275–288.
Merrington, G., Oliver, I., Smermik, R. J., and McLaughlin, M. L. (2003). “The influence of sewage sludge properties on sludge-borne metal availability.” Adv. Environ. Res., 8(1), 21–36.
Tyagi, R. D., Blais, J. F., and Auclair, J. F. (1993). “Bacterial leaching of metals from sewage sludge by indigenous iron-oxidizing bacteria.” Environ. Pollut., 82(1), 9–12.
Tyagi, R. D., Blais, J. F., Meunier, N., and Benmoussa, H. (1997). “Simultaneous sewage sludge digestion and metal leaching-effect of sludge solid concentration.” Water Res., 31(1), 105–118.
Tyagi, R. D., and Couillard, D. (1989). “Bacterial leaching of metals from sludge.” Encyclopedia of environmental control technology, water treatment technology, P. E. Chereminsinoff, ed., Gulf Publishing Co., Tex., Vol. 3, 557–591.
Tyagi, R. D., and Couillard, D. (1991). “An innovative bioleaching process for heavy metals removal from municipal sludge.” Biological degradation of wastes, A. M. Martin, ed., Elsevier Science, Amsterdam, The Netherlands, 307–322.
Wang, J. L., and Wang, J. Z. (2007). “Application of radiation technology to sewage sludge processing: A review.” J. Hazard. Mater., 143(1–2), 2–7.
Werther, J., and Ogada, T. (1999). “Sewage sludge combustion.” Prog. Energy Combust. Sci., 25(1), 55–116.
Wong, J. W. C., Fang, M., Li, G. X., and Wong, M. H. (1997). “Feasibility of using coal ash residues as co-composting materials for sewage sludge.” Environ. Technol., 16(6), 527–537.
Wong, J. W. C., Xiang, L., and Chan, L. C. (2002). “pH requirement for bioleaching of heavy metals from anaerobically digested sewage sludge.” Water, Air, Soil Pollut., 138(1–4), 25–35.
Wong, L., and Henry, J. G. (1988). “Bacterial leaching of heavy metals from anaerobically digested sludge.” Biotreatment system, D. L. Wise, ed., Vol. 2, CRC, Boca Raton, Fla., 125–169.
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© 2008 ASCE.
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Received: Sep 20, 2007
Accepted: Sep 20, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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