Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | TWO-PHASE PARTITIONING BIOREACTORS OPERATING WITH POLYMERS APPLIED TO THE REMOVAL OF SUBSTITUTED PHENOLS |
| Abstract | Significant improvement in biodegradation performance has been demonstrated arising from the reduction of cytotoxicity provided by the sequestering of 4-nitrophenol (4NP) within Hytrel polymer beads added to a two-phase partitioning bioreactor (TPPB) operating in sequencing batch reactor (SBR) mode. This reduced toxicity is particularly apparent as the feed substrate concentration is increased; in fact it was shown that at a feed of 1000 mg/L 4NP, the inhibitory effect of the substrate completely prevents degradation from occurring in a singlephase system, whereas at only a 5% polymer loading, rapid and compete biodegradation is achieved. Different polymer/ aqueous phase ratios were used to detoxify varying feed concentrations, and degradation rates were enhanced through the use of increased polymer loadings. As demonstrated in oxygen uptake experiments, the addition of polymers also reduces the maximum demand for oxygen, relative to single-phase operation, and smoothes the demand for oxygen throughout the degradation process. Polymer regeneration has also been further characterized by quantifying the number of methanol washes required to achieve satisfactory 4NP residuals, and the addition of a small amount of cosolvent has been shown to dramatically increase the rate of bioregeneration to produce beads ready for reuse. |
| Source | Environmental science & technology 44 (19), pp. 7254–7259 |
| Keywords | Solid-liquid TPPBsSubstituted henolsIndustrial wastewater treatment |
| Journal | Environmental science & technology |
| Editor | American Chemical Society,, Easton, Pa., Stati Uniti d'America |
| Year | 2010 |
| Type | Articolo in rivista |
| DOI | 10.1021/es903806p |
| Authors | TOMEI M.C. (1); ANNESINI M.C. (2); RITA S. (1); DAUGULIS A.J. (3) |
| Text | 42393 2010 10.1021/es903806p ISI Web of Science WOS 000282209700016 Solid liquid TPPBs Substituted henols Industrial wastewater treatment TWO PHASE PARTITIONING BIOREACTORS OPERATING WITH POLYMERS APPLIED TO THE REMOVAL OF SUBSTITUTED PHENOLS TOMEI M.C. 1 ; ANNESINI M.C. 2 ; RITA S. 1 ; DAUGULIS A.J. 3 1 Water Research Institute, C.N.R., Via Salaria km 29.300, CP 10 00015 Monterotondo Stazione Rome Italy; 2 Department of Chemical Engineering Materials Environment, Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy; 3 Department of Chemical Engineering, Queen s University, Kingston, Ontario, Canada K7L 3N6 Significant improvement in biodegradation performance has been demonstrated arising from the reduction of cytotoxicity provided by the sequestering of 4 nitrophenol 4NP within Hytrel polymer beads added to a two phase partitioning bioreactor TPPB operating in sequencing batch reactor SBR mode. This reduced toxicity is particularly apparent as the feed substrate concentration is increased; in fact it was shown that at a feed of 1000 mg/L 4NP, the inhibitory effect of the substrate completely prevents degradation from occurring in a singlephase system, whereas at only a 5% polymer loading, rapid and compete biodegradation is achieved. Different polymer/ aqueous phase ratios were used to detoxify varying feed concentrations, and degradation rates were enhanced through the use of increased polymer loadings. As demonstrated in oxygen uptake experiments, the addition of polymers also reduces the maximum demand for oxygen, relative to single phase operation, and smoothes the demand for oxygen throughout the degradation process. Polymer regeneration has also been further characterized by quantifying the number of methanol washes required to achieve satisfactory 4NP residuals, and the addition of a small amount of cosolvent has been shown to dramatically increase the rate of bioregeneration to produce beads ready for reuse. 44 http //pubs.acs.org/doi/abs/10.1021/es903806p Articolo pubblicato Articolo pubblicato su rivista ISI Tomei_et_al_ES_T_2010.pdf Articolo in rivista American Chemical Society, 0013 936X Environmental science technology Environmental science technology Environ. sci. technol. Environmental science technology. ES T Environmental science and technology mariaconcetta.tomei TOMEI MARIA CONCETTA TA.P07.002.005 Rimozione di composti xenobiotici da acque di scarico |