【标题】Enhanced cadmium remediation from acid mine drainage using Desulfovibrio sp. ZHS8 in conjunction with bovine bone meal: Performance and mechanisms

【期刊】Journal of Environmental Chemical Engineering

【第一作者】赖伟斌

【摘要】The urgent global concern of acid mine drainage (AMD) necessitates effective methods for the removal of heavy metal and sulfate pollutants. This study introduces a novel approach utilizing Desulfovibrio sp. ZHS8 immobilized on bovine bone meal (BBM) for Cd2 + and SO42-removal from AMD. The strain used in this study was isolated from AMD sediments, which was immobilized on BBM to produce BBM-inoculated bacteria (BMIB). The effects of time, initial pH and initial Cd2+ concentration on Cd2+ immobilization and reduction of SO 4 2- by BBM, ZHS8 and BMIB were investigated. The results showed that the composite system of BMIB removed 99 % Cd2+ and 70 % of SO42-. Compared with the single components of BBM and ZHS8, the BMIB system combined the advantages of the two components, making it both efficient in Cd2+ and SO42-removal. On the one hand, BBM improved the tolerance of ZHS8 at all pH, especially in the initial pH range of 5.0-7.0. On the other hand, BBM improved the Cd2+ resistance of ZHS8 to 20 mg/L. In addition, the products of Cd2+ removal by BMIB were characterized using Fourier transform infrared spectrometer, X-ray diffraction and X-ray photoelectron spectroscopy, which indicated that the removal mechanisms could be categorized as chemisorption, ion exchange and chemical precipitation. These findings provide valuable insights into the remediation of BMIB adsorbents in heavy metal contaminated environments and highlight the potential applicability of mineral-microbial composites in the treatment of AMD.

【文章链接】https://doi.org/10.1016/j.jece.2025.115480