In this work a batch-optimised mixture (w/w %: 6% leaves, 9% compost, 3% Fe(0), 30% silica sand, 30% perlite, 22% limestone) was investigated in a continuous fixed bed column reactor for the treatment of synthetic acid-mine drainage (AMD). A column reactor was inoculated with sulphate-reducing bacteria and fed with a solution containing sulphate and heavy metals (As(V), Cd, Cr(VI), Cu and Zn). At steady state, sulphate abatement was 50 +/- 10%, while metals were totally removed. A degradation rate constant (k) of 0.015 +/- 0.001 h(-1) for sulphate removal was determined from column data by assuming a first order degradation rate. Reduction of AMD toxicity was assessed by using the nematode Caenorbabditis elegans as a test organism. A lethality assay was performed with the toxicants before and after the treatment, showing that only 5% of the animals were still alive after 48 h in presence of the contaminants, while the percentage increased to 73% when the nematodes were exposed to the solution eluted from the column. (C) 2009 Elsevier Ltd. All rights reserved.

Biotreatment and bioassessment of heavy metal removal by sulphate reducing bacteria in fixed bed reactors / CRUZ VIGGI, Carolina; Pagnanelli, Francesca; Cibati, Alessio; Uccelletti, Daniela; Palleschi, Claudio; Toro, Luigi. - In: WATER RESEARCH. - ISSN 0043-1354. - STAMPA. - 44:1(2010), pp. 151-158. [10.1016/j.watres.2009.09.013]

Biotreatment and bioassessment of heavy metal removal by sulphate reducing bacteria in fixed bed reactors

CRUZ VIGGI, CAROLINA;PAGNANELLI, Francesca;CIBATI, ALESSIO;UCCELLETTI, Daniela;PALLESCHI, Claudio;TORO, Luigi
2010

Abstract

In this work a batch-optimised mixture (w/w %: 6% leaves, 9% compost, 3% Fe(0), 30% silica sand, 30% perlite, 22% limestone) was investigated in a continuous fixed bed column reactor for the treatment of synthetic acid-mine drainage (AMD). A column reactor was inoculated with sulphate-reducing bacteria and fed with a solution containing sulphate and heavy metals (As(V), Cd, Cr(VI), Cu and Zn). At steady state, sulphate abatement was 50 +/- 10%, while metals were totally removed. A degradation rate constant (k) of 0.015 +/- 0.001 h(-1) for sulphate removal was determined from column data by assuming a first order degradation rate. Reduction of AMD toxicity was assessed by using the nematode Caenorbabditis elegans as a test organism. A lethality assay was performed with the toxicants before and after the treatment, showing that only 5% of the animals were still alive after 48 h in presence of the contaminants, while the percentage increased to 73% when the nematodes were exposed to the solution eluted from the column. (C) 2009 Elsevier Ltd. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/361491
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