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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 7, 2015, pp. 2143-2152
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Bioline Code: st15201
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 7, 2015, pp. 2143-2152
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Consequences of anaerobic biotreatments of contaminated sediments on metal mobility
Beolchini, F.; Rocchetti, L.; Fonti, V. & Dell’Anno, A.
Abstract
This study deals with anaerobic biotreatments
of sediments contaminated with toxic metals carried out in
slurry reactor. The sediment samples used for the investigation
came from two Italian ports, and they were mainly
contaminated with inorganic compounds (zinc, nickel and
chromium). The treatments were aimed at assessing the
responses of the autochthonous microbial community in
relation to the geochemistry of the sediments (mainly
organic carbon bioavailability) and the addition of organic
and inorganic substrates. It was observed that the bioavailable
carbon in the sediments can greatly influence
microbial growth but without a significant effect on metal
mobilization. By contrast, the supply of inorganic nutrients
to the sediments did not have a major effect on microbial
growth although important changes in metal mobility were
observed. Our results provide new insights on the effects of
anaerobic biotreatments on changes in metal partitioning in
contaminated sediments, highlighting that, under certain
conditions, an increase of metals in the more mobile
fractions can occur.
Keywords
Anaerobic treatments; Bioreactor; Bioremediation; Marine sediments; Metals
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