Biological treatment of Cr(VI) contaminated waters was performed in fixed bed reactors inoculated with SRB (sulphate-reducing bacteria) growing on ethanol. Treatment efficiency was evaluated by checking chemical abatement of Cr(VI) and by ecotoxicological tests using the nematode Caenorhabditis elegans. A preliminary comparison between ethanol and lactate was performed, denoting that using ethanol, the same values of final sulphate abatement were obtained. In addition ethanol showed to be a substrate more competitive than lactate in kinetic terms. Fixed bed column reactors were continuously fed with a solution containing sulphates (3gL -1), ethanol (1.5gL -1) and Cr(VI) (50mgL -1). At steady state the column inoculated with SRB removed 65±5% of sulphate and 95±5% of chromium. Bioactive removal mechanisms predominated over biosorption. Diminution of Cr(VI) toxicity was assessed by using the nematode C. elegans as a test organism showing that the survival of nematodes was 20% in the presence of the untreated influent and raised up to 53% when the nematodes were exposed to the treated effluent. © 2011 Elsevier B.V.

Biotreatment of Cr(VI) contaminated waters by sulphate reducing bacteria fed with ethanol / Pagnanelli, Francesca; CRUZ VIGGI, Carolina; Cibati, Alessio; Uccelletti, Daniela; Toro, Luigi; Palleschi, Claudio. - In: JOURNAL OF HAZARDOUS MATERIALS. - ISSN 0304-3894. - STAMPA. - 199-200:(2012), pp. 186-192. [10.1016/j.jhazmat.2011.10.082]

Biotreatment of Cr(VI) contaminated waters by sulphate reducing bacteria fed with ethanol

PAGNANELLI, Francesca;CRUZ VIGGI, CAROLINA;CIBATI, ALESSIO;UCCELLETTI, Daniela;TORO, Luigi;PALLESCHI, Claudio
2012

Abstract

Biological treatment of Cr(VI) contaminated waters was performed in fixed bed reactors inoculated with SRB (sulphate-reducing bacteria) growing on ethanol. Treatment efficiency was evaluated by checking chemical abatement of Cr(VI) and by ecotoxicological tests using the nematode Caenorhabditis elegans. A preliminary comparison between ethanol and lactate was performed, denoting that using ethanol, the same values of final sulphate abatement were obtained. In addition ethanol showed to be a substrate more competitive than lactate in kinetic terms. Fixed bed column reactors were continuously fed with a solution containing sulphates (3gL -1), ethanol (1.5gL -1) and Cr(VI) (50mgL -1). At steady state the column inoculated with SRB removed 65±5% of sulphate and 95±5% of chromium. Bioactive removal mechanisms predominated over biosorption. Diminution of Cr(VI) toxicity was assessed by using the nematode C. elegans as a test organism showing that the survival of nematodes was 20% in the presence of the untreated influent and raised up to 53% when the nematodes were exposed to the treated effluent. © 2011 Elsevier B.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/432957
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