Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | BIODEGRADATION OF 4-NITROPHENOL IN A TWO PHASE SYSTEM OPERATING WITH POLYMERS AS THE PARTITIONING PHASE |
| Abstract | The present study has demonstrated the enhanced performance of a two-phase bioreactor, operating with polymers as a partitioning phase, as an alternative to both single phase biotreatment and to the use of an immiscible organic solvent partitioning phase, to deliver a toxic substrate (4-nitrophenol, or 4NP) to a microbial consortium in batch and repeated batch mode. Three commercial polymers were tested, HytrelTM, ToneTM and ElvaxTM, and were shown to have superior properties related to the use of a consortium, including complete biocompatibility with the biomass and non-biodegradability. Repeated kinetic tests performed with short reaction times demonstrated the accumulation of 4NP within the polymers in the range of 6-8 mg/g polymer, which reduced polymer performance in subsequent batch operations. HytrelTM gave the best performance with residuals of up to 4 mg /g polymer showing no reduction in subsequent use, while for the other polymers a 4NP value lower than 2 mg/g polymer was required to have acceptable performance during repeated polymer use. Polymer reuse without affecting the process efficiency was confirmed with regeneration tests. A conventional methanol extraction method, as well as biological regeneration of the polymers by prolonged contact with the biomass, were assessed for their ability to remove the residual 4NP. Parallel kinetic tests performed with new and regenerated polymers showed a complete overlap of the 4NP concentration profiles indicating that a simple biological regeneration method provides a means of completely restoring polymer performance for repeated batch operation. |
| Source | Environmental science & technology 43 (18), pp. 7105–7110 |
| Keywords | 4-Nitrophenolsolid-liquid TPPBsbiodegradation |
| Journal | Environmental science & technology |
| Editor | American Chemical Society,, Easton, Pa., Stati Uniti d'America |
| Year | 2009 |
| Type | Articolo in rivista |
| DOI | 10.1021/es9010042 |
| Authors | TOMEI M.C. (1); ANNESINI M.C. (2); PRPICH G. (3); DAUGULIS A.J. (3) |
| Text | 42350 2009 10.1021/es9010042 ISI Web of Science WOS 000269656200037 4 Nitrophenol solid liquid TPPBs biodegradation BIODEGRADATION OF 4 NITROPHENOL IN A TWO PHASE SYSTEM OPERATING WITH POLYMERS AS THE PARTITIONING PHASE TOMEI M.C. 1 ; ANNESINI M.C. 2 ; PRPICH G. 3 ; DAUGULIS A.J. 3 1 Water Research Institute, C.N.R., Via Salaria km 29.300, CP 10 00016 Monterotondo Stazione Rome Italy; 2 Department of Chemical Engineering Materials Environment, Sapienza University, Via Eudossiana 18, 00184 Rome, Italy; 3 Department of Chemical Engineering, Queen s University, Kingston Canada K7L 3N6 The present study has demonstrated the enhanced performance of a two phase bioreactor, operating with polymers as a partitioning phase, as an alternative to both single phase biotreatment and to the use of an immiscible organic solvent partitioning phase, to deliver a toxic substrate 4 nitrophenol, or 4NP to a microbial consortium in batch and repeated batch mode. Three commercial polymers were tested, HytrelTM, ToneTM and ElvaxTM, and were shown to have superior properties related to the use of a consortium, including complete biocompatibility with the biomass and non biodegradability. Repeated kinetic tests performed with short reaction times demonstrated the accumulation of 4NP within the polymers in the range of 6 8 mg/g polymer, which reduced polymer performance in subsequent batch operations. HytrelTM gave the best performance with residuals of up to 4 mg /g polymer showing no reduction in subsequent use, while for the other polymers a 4NP value lower than 2 mg/g polymer was required to have acceptable performance during repeated polymer use. Polymer reuse without affecting the process efficiency was confirmed with regeneration tests. A conventional methanol extraction method, as well as biological regeneration of the polymers by prolonged contact with the biomass, were assessed for their ability to remove the residual 4NP. Parallel kinetic tests performed with new and regenerated polymers showed a complete overlap of the 4NP concentration profiles indicating that a simple biological regeneration method provides a means of completely restoring polymer performance for repeated batch operation. 43 http //pubs.acs.org/doi/abs/10.1021/es9010042 Articolo pubblicato Articolo pubblicato su rivista internazionale ISI es9010042printed.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 |