Bioremediation of Heavy Metal-Contaminated Soils by Sulfate-Reducing Bacteria

2008 ◽  
Vol 1140 (1) ◽  
pp. 446-454 ◽  
Author(s):  
Wei Jiang ◽  
Wenhong Fan
Keyword(s):  
Heavy Metal ◽  
Contaminated Soils ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Reducing Bacteria

scholarly journals Advances in heavy metal removal by sulfate-reducing bacteria

2020 ◽  
Vol 81 (9) ◽  
pp. 1797-1827 ◽  
Author(s):  
Ya-Nan Xu ◽  
Yinguang Chen
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Industrial Development ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Recent Advances ◽  
Conventional Methods ◽  
Reducing Bacteria

Abstract Industrial development has led to generation of large volumes of wastewater containing heavy metals, which need to be removed before the wastewater is released into the environment. Chemical and electrochemical methods are traditionally applied to treat this type of wastewater. These conventional methods have several shortcomings, such as secondary pollution and cost. Bioprocesses are gradually gaining popularity because of their high selectivities, low costs, and reduced environmental pollution. Removal of heavy metals by sulfate-reducing bacteria (SRB) is an economical and effective alternative to conventional methods. The limitations of and advances in SRB activity have not been comprehensively reviewed. In this paper, recent advances from laboratory studies in heavy metal removal by SRB were reported. Firstly, the mechanism of heavy metal removal by SRB is introduced. Then, the factors affecting microbial activity and metal removal efficiency are elucidated and discussed in detail. In addition, recent advances in selection of an electron donor, enhancement of SRB activity, and improvement of SRB tolerance to heavy metals are reviewed. Furthermore, key points for future studies of the SRB process are proposed.

scholarly journals Cadmium Accumulation and DNA Homology with Metal Resistance Genes in Sulfate-Reducing Bacteria

2005 ◽  
Vol 71 (8) ◽  
pp. 4610-4618 ◽  
Author(s):  
Naghma Naz ◽  
Hilary K. Young ◽  
Nuzhat Ahmed ◽  
Geoffrey M. Gadd
Keyword(s):  
Heavy Metal ◽  
Desulfovibrio Desulfuricans ◽  
Sulfate Reducing Bacteria ◽  
Cadmium Accumulation ◽  
Metal Resistance ◽  
Dot Blot ◽  
Cadmium Resistance ◽  
Lactate Oxidation ◽  
Sulfate Reducing ◽  
Reducing Bacteria

ABSTRACT Cadmium resistance (0.1 to 1.0 mM) was studied in four pure and one mixed culture of sulfate-reducing bacteria (SRB). The growth of the bacteria was monitored with respect to carbon source (lactate) oxidation and sulfate reduction in the presence of various concentrations of cadmium chloride. Two strains Desulfovibrio desulfuricans DSM 1926 and Desulfococcus multivorans DSM 2059 showed the highest resistance to cadmium (0.5 mM). Transmission electron microscopy of the two strains showed intracellular and periplasmic accumulation of cadmium. Dot blot DNA hybridization using the probes for the smtAB, cadAC, and cadD genes indicated the presence of similar genetic determinants of heavy metal resistance in the SRB tested. DNA sequencing of the amplified DNA showed strong nucleotide homology in all the SRB strains with the known smtAB genes encoding synechococcal metallothioneins. Protein homology with the known heavy metal-translocating ATPases was also detected in the cloned amplified DNA of Desulfomicrobium norvegicum I1 and Desulfovibrio desulfuricans DSM 1926, suggesting the presence of multiple genetic mechanisms of metal resistance in the two strains.

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