Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Treatment of substituted phenol mixtures in single phase and two-phase solid-liquid partitioning bioreactors |
| Abstract | The biological treatment of phenolics is constrained by the inherent cytotoxicity of these compounds. One method to alleviate such toxicity is to add a sequestering phase to absorb, and subsequently release, the substrate(s) to the micro-organisms; such a system is termed a Two Phase Partitioning Bioreactor. Here we have compared the performance of a TPPB, relative to single phase operation, in which a small volume (5%, v/v) of beads of the polymer Hytrel 8206 was used to treat aqueous mixtures of 2,4-dimethylphenol and 4-nitrophenol. Hytrel 8206 was selected from a range of polymers that were tested for their partition coefficients (PCs) for the target molecules, with the more hydrophobic compound (2,4-dimethylphenol) having a higher PC value (201) than 4-nitrophenol (143). Significantly increased removal rates for both substrates were demonstrated in TPPB mode relative to single phase operation. Additionally, the differential release of the compounds to the aqueous phase and their distinct PC values changed the kinetic pattern of the biotreatment system, smoothing out the cellular oxygen demand. Release of the substrates by the polymer over 60 operating cycles was virtually complete (>97%) demonstrating the reusability and robustness of the use of polymers in overcoming cytotoxicity of phenolic substrates. (C) 2011 Elsevier B.V. All rights reserved. |
| Source | Journal of hazardous materials (Print) 191 (1-3), pp. 190–195 |
| Keywords | Phenolic mixtures degradationSolid-liquid TPPBs24-Dimethylphenol4-NitrophenolPolymers |
| Journal | Journal of hazardous materials (Print) |
| Editor | Elsevier, New York ;, Paesi Bassi |
| Year | 2011 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.jhazmat.2011.04.061 |
| Authors | Tomei, M. Concetta; Rita, Sara; Angelucci, Domenica Mosca; Annesini, M. Cristina; Daugulis, Andrew J. |
| Text | 42429 2011 10.1016/j.jhazmat.2011.04.061 ISI Web of Science WOS 000292852300025 Phenolic mixtures degradation Solid liquid TPPBs 2 4 Dimethylphenol 4 Nitrophenol Polymers Treatment of substituted phenol mixtures in single phase and two phase solid liquid partitioning bioreactors Tomei, M. Concetta; Rita, Sara; Angelucci, Domenica Mosca; Annesini, M. Cristina; Daugulis, Andrew J. Istituto di Ricerca Sulle acque CNR, Universita La Sapienza Roma, Queen s University Kingstion Ontario Canada The biological treatment of phenolics is constrained by the inherent cytotoxicity of these compounds. One method to alleviate such toxicity is to add a sequestering phase to absorb, and subsequently release, the substrate s to the micro organisms; such a system is termed a Two Phase Partitioning Bioreactor. Here we have compared the performance of a TPPB, relative to single phase operation, in which a small volume 5%, v/v of beads of the polymer Hytrel 8206 was used to treat aqueous mixtures of 2,4 dimethylphenol and 4 nitrophenol. Hytrel 8206 was selected from a range of polymers that were tested for their partition coefficients PCs for the target molecules, with the more hydrophobic compound 2,4 dimethylphenol having a higher PC value 201 than 4 nitrophenol 143 . Significantly increased removal rates for both substrates were demonstrated in TPPB mode relative to single phase operation. Additionally, the differential release of the compounds to the aqueous phase and their distinct PC values changed the kinetic pattern of the biotreatment system, smoothing out the cellular oxygen demand. Release of the substrates by the polymer over 60 operating cycles was virtually complete >97% demonstrating the reusability and robustness of the use of polymers in overcoming cytotoxicity of phenolic substrates. C 2011 Elsevier B.V. All rights reserved. 191 Published version 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 RITA SARA domenica.moscaangelucci MOSCA ANGELUCCI DOMENICA mariaconcetta.tomei TOMEI MARIA CONCETTA TA.P07.002.005 Rimozione di composti xenobiotici da acque di scarico |