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Bioremediation of Dredged Sediments Polluted by Heavy Metals
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Bioremediation of Dredged Sediments Polluted by Heavy Metals

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Abstract:

The present work deals with a bioremediation study of a heavy-metal polluted harbour sediment, obtained from the Italian Adriatic Coast. Bioleaching of the sediment sample was performed with a mixed culture of acidophilic, chemi-autotrophic Fe/S oxidising bacteria. The effect of an anaerobic biostimulation pre-treatment on the extent of Cd, Cu, Zn, Ni, Pb, Hg, As, Cr extraction by bioleaching was evaluated. The biostimulation pre-treatment was intended to stimulate autochthonous sulfate reducing strains, to enhance the sulfide fraction in the sediment, to favour subsequent activity of reduced-sulfur-oxidizing bacteria in the subsequent bioaugmentation (bioleaching). The effect of the duration of anaerobic pre-treatment (21 and 30 days) in the presence and absence of 1% glucose was tested. The results obtained showed that the activity of the reducedsulfur- oxidising strains was significantly enhanced after an anaerobic pre-treatment of the sediments and showed real promise for the application of bioleaching for metal polluted sediments.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

307-310

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.307

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Online since:

July 2007

Authors:

F. Beolchini, S. Ubaldini, B. Passariello, N. Gül, D. Türe, Francesco Vegliò, R. Danovaro, A. Dell'Anno

Keywords:

Anaerobiosis, Bioleaching, Bioremediation, Metal, Sediment, Thiobacilli

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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