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• W2079326153 abstract "The potential impact of indigenous bacterial processes on the release of heavy metals from dredged sediment deposits was investigated. Batch re-suspension experiments were conducted in order to investigate the release of Zn, Cd, Cu and Pb from a polluted anoxic sediment submitted to oxidative perturbations. The concentrations of heavy metals, sulphate and dissolved organic carbon (DOC) were periodically recorded, and cell counts were performed to follow the evolution of several bacterial species. The specific effects of microbial processes were quantified by performing re-suspension assays on sterilised samples. Moreover, the effect of an initial acidification of the system was studied. The results showed that metal release was mainly due to oxidation of sulphide minerals contained in the sediment. Sulphur-oxidising bacteria such as Acidithiobacillus thiooxidans were identified to play a major role in the process, by enhancing the oxidation kinetic. However, the acid production resulting from these reactions was almost totally buffered by the dissolution of the calcite present in the sediment. Copper was released to a lesser extent, and a strong association with organic matter was observed. Lead was not observed in solution, because of its low solubility at neutral conditions and of its re-adsorption on the solid phase. The initial acidification of the system resulted in an faster growth of the acidophilic A. thiooxidans. A subsequent pH drop originating from microbial processes was then observed during the first stages of the experiment. As a consequence, drastic increases in metal (Zn, Cd) release were observed." @default.
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• W2079326153 date "2004-08-01" @default.
• W2079326153 modified "2023-09-26" @default.
• W2079326153 title "Effects of bacterial activities on the release of heavy metals from contaminated dredged sediments" @default.
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• W2079326153 doi "https://doi.org/10.1016/j.chemosphere.2004.04.009" @default.
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