Evaluation of the Removal of Heavy Metals from Contaminated Sediment in Continuous Flow Tests with Selective Sequential Extraction

2008 ◽  
pp. 200-200-10 ◽  
Author(s):  
B Dahrazma ◽  
CN Mulligan
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Continuous Flow ◽  
Contaminated Sediment ◽  
Selective Sequential Extraction ◽  
Removal Of Heavy Metals

Removal of Heavy Metals (Cu, Pb, and Zn) from Contaminated Sediment Using a Flotation Technique

2012 ◽  
Vol 9 (4) ◽  
pp. 104210
Author(s):  
Dileep Palakkeel veetil ◽  
Guy Mercier ◽  
Jean-Francois Blais
Keyword(s):  
Heavy Metals ◽  
Contaminated Sediment ◽  
Removal Of Heavy Metals ◽  
Flotation Technique

Effects of ferric ion on bioleaching of heavy metals from contaminated sediment

2003 ◽  
Vol 48 (8) ◽  
pp. 151-158 ◽  
Author(s):  
S.Y. Chen ◽  
J.G. Lin ◽  
C.Y. Lee
Keyword(s):  
Heavy Metals ◽  
Ferric Ion ◽  
Contaminated Sediment ◽  
Practical Application ◽  
Slow Kinetics ◽  
Removal Of Heavy Metals ◽  
Sulfur Oxidizing ◽  
Sediment Ph ◽  
Kinetics Of ◽  
Metal Solubilization

Bioleaching is one of the promising procedures for removal of heavy metals from contaminated sediments. The advantages of this biotechnology are that it is easy, efficient, less costly and friendly to the environment. However, the principal disadvantage of this process is its slow kinetics in metal solubilization, which may limit practical application of the bioleaching process. In order to enhance the rate and efficiency of metal solubilization, the ferric ion was used as a catalytic agent in the bioleaching process. It was found that the sediment pH apparently decreased in the bioleaching after addition of ferric ion. The metal solubilization increased quickly after the addition of ferric ion. The rate of metal solubilization was enhanced by the addition of ferric ion, especially for Cr and Pb. An increase in the amount of ferric ion added increased the final efficiency of metal solubilization. The highest final efficiency of metal solubilization was obtained in the bioleaching with 1 g/L of ferric ion. Besides, the growth of sulfur-oxidizing bacteria was not affected by addition of ferric ion in the bioleaching. It was concluded that the kinetics of metal solubilization were enhanced by addition of ferric ion in the bioleaching process.

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