Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Assessment of solid reactive mixtures for the development of biological permeable reactive barriers |
| Abstract | Solid reactive mixtures were tested as filling material for the development of biological permeable reactive barriers for the treatment of heavy metals contaminated waters. Mixture selection was performed by taking into account the different mechanisms operating in sulphate and cadmium removal with particular attention to bioprecipitation and sorption onto the organic matrices in the mixtures. Suspensions of eight reactive mixtures were tested for sulphate removal (initial concentration 3 g L-1). Each mixture was made up of four main functional components: a mix of organic sources for bacterial growth, a neutralizing agent, a porous medium and zero-valent iron. The best mixture among the tested ones (M8: 6% leaves, 9% compost, 3% zero-valent iron, 30% silica sand, 30% perlite, 22% limestone) presented optimal conditions for SRB growth (pH 7.8 ± 0.1; Eh = -410 ± 5 mV) and 83% sulphate removal in 22 days (25% due to bioreduction, 32% due to sorption onto compost and 20% onto leaves). M8 mixture allowed the complete abatement of cadmium with a significant contribution of sorption over bioprecipitation (6% Cd removal due to SRB activity). Sorption properties, characterised by potentiometric titrations and related modelling, were mainly due to carboxylic sites of organic components used in reactive mixtures. |
| Source | Journal of hazardous materials (Print) 170 (2-3), pp. 998–1005 |
| Keywords | Batch reactorBioprecipitationPermeable reactive barrierSorptionSulphate-reducing bacteria |
| Journal | Journal of hazardous materials (Print) |
| Editor | Elsevier, New York ;, Paesi Bassi |
| Year | 2009 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.jhazmat.2009.05.081 |
| Authors | Pagnanelli, Francesca; Cruz Viggi, Carolina; Mainelli, Sara; Toro, Luigi |
| Text | 378961 2009 10.1016/j.jhazmat.2009.05.081 Scopus 2 s2.0 69249215310 Batch reactor Bioprecipitation Permeable reactive barrier Sorption Sulphate reducing bacteria Assessment of solid reactive mixtures for the development of biological permeable reactive barriers Pagnanelli, Francesca; Cruz Viggi, Carolina; Mainelli, Sara; Toro, Luigi Universita degli Studi di Roma La Sapienza Solid reactive mixtures were tested as filling material for the development of biological permeable reactive barriers for the treatment of heavy metals contaminated waters. Mixture selection was performed by taking into account the different mechanisms operating in sulphate and cadmium removal with particular attention to bioprecipitation and sorption onto the organic matrices in the mixtures. Suspensions of eight reactive mixtures were tested for sulphate removal initial concentration 3 g L 1 . Each mixture was made up of four main functional components a mix of organic sources for bacterial growth, a neutralizing agent, a porous medium and zero valent iron. The best mixture among the tested ones M8 6% leaves, 9% compost, 3% zero valent iron, 30% silica sand, 30% perlite, 22% limestone presented optimal conditions for SRB growth pH 7.8 ± 0.1; Eh = 410 ± 5 mV and 83% sulphate removal in 22 days 25% due to bioreduction, 32% due to sorption onto compost and 20% onto leaves . M8 mixture allowed the complete abatement of cadmium with a significant contribution of sorption over bioprecipitation 6% Cd removal due to SRB activity . Sorption properties, characterised by potentiometric titrations and related modelling, were mainly due to carboxylic sites of organic components used in reactive mixtures. 170 Published version http //www.scopus.com/record/display.url eid=2 s2.0 69249215310 origin=inward Articolo in rivista Elsevier 0304 3894 Journal of hazardous materials Print Journal of hazardous materials Print J. hazard. mater. Print Journal of hazardous materials. Print carolina.cruzviggi CRUZ VIGGI CAROLINA |