Transformation of heavy metals and the formation of secondary iron minerals during pig manure bioleaching by the co-inoculation acidophilic thiobacillus

Jun ZHOU, Lixiang ZHOU, Fenwu LIU, Chaocheng ZHENG, Wenjing DENG

Research output: Contribution to journalArticles

9 Citations (Scopus)

Abstract

Bioleaching of heavy metals from pig manure using a mixture of harmless iron- and sulfur-oxidizing bacteria in an air-lift reactor was conducted. The transformation of heavy metals and the formation of secondary Fe minerals during bioleaching were also investigated in the present study. The removal efficiencies of Zn, Cu, and Mn from pig manure were 95.1%, 80.9%, and 87.5%, respectively. Zn mainly existed in the form of Fe–Mn oxides in fresh pig manure; most of the pig manure-borne Cu was in organic matter form; Mn existed mainly in Fe–Mn oxides, carbonates, and residual forms. The pig manure can be applied to land more safely after bioleaching because the heavy metals mainly existed in stable forms. The removal efficiencies Zn, Cu, and Mn had good relationships with pH and oxidation reduction potential during bioleaching. A mixture of jarosite and schwertmannite was found in the bioleached pig manure, which might have an adverse effect on the solubilization efficiency of toxic metals from pig manure. The bioleaching process using a mixture of harmless iron- and sulfur-oxidizing bacteria was shown to be a very feasible technology for the removal of heavy metals from pig manure. Copyright © 2012 Taylor & Francis Group, an informa business.
Original languageEnglish
Pages (from-to)2553-2560
JournalEnvironmental Technology
Volume33
Issue number22
DOIs
Publication statusPublished - 2012

Citation

Zhou, J., Zhou, L., Liu, F., Zheng, C., & Deng, W. (2012). Transformation of heavy metals and the formation of secondary iron minerals during pig manure bioleaching by the co-inoculation acidophilic thiobacillus. Environmental Technology, 33(22), 2553-2560.

Keywords

  • Bioleaching
  • Heavy metals
  • Pig manure
  • Acidophilic thiobacillus
  • Secondary iron minerals

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