Continuous combined Fenton’s oxidation and biodegradation for the treatment of pentachlorophenol-contaminated water
| Autor: | Julio A. Zimbron, Kenneth F. Reardon |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
inorganic chemicals
Pentachlorophenol Environmental Engineering Iron Portable water purification complex mixtures Article Water Purification chemistry.chemical_compound Bioreactors Chlorides Bioreactor Recycling Biomass Hydrogen peroxide Waste Management and Disposal Effluent Water Science and Technology Civil and Structural Engineering organic chemicals Ecological Modeling Water Pollution technology industry and agriculture Proteins Hydrogen Peroxide Chemical reactor Biodegradation equipment and supplies Pollution Carbon Kinetics Biodegradation Environmental Models Chemical chemistry Environmental chemistry Degradation (geology) Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | Water Research. 45:5705-5714 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2011.08.038 |
| Popis: | Pentachlorophenol (PCP) was studied as a model recalcitrant compound for a sequential chemical oxidation and biodegradation treatment, in a continuous laboratory-scale system that combined a Fenton's chemical reactor and a packed-bed bioreactor. PCP degradation and dechlorination were observed in the Fenton's reactor at a residence time of 1.5 h, although no reduction of total organic carbon (TOC) was observed. Both PCP degradation and dechlorination were strongly dependent on the H(2)O(2) dose to the chemical reactor. The PCP degradation intermediates tetrachlorohydroquinone and dichloromaleic acid were identified in this reactor. Further treatment of the Fenton's reactor effluent with a packed-bed bioreactor (operating at a residence time of 5.5 h) resulted in partial biodegradation of PCP degradation intermediates and reduction in TOC, although no further reduction of PCP or dechlorination was achieved in the bioreactor. Increased residence time in the bioreactor had no significant impact on degradation of TOC. Recycle of the effluent from the bioreactor to the chemical reactor increased the TOC degradation, but not the extent of the PCP degradation or dechlorination. A mathematical model of the combined Fenton's oxidation and biodegradation system supported the experimental results. While the model over-predicted the PCP and TOC degradation in the combined system, it adequately predicted the sensitivity of these parameters to different H(2)O(2) doses and recycle rates. The model indicated that high recycle rates would improve TOC degradation. |
| Databáze: | OpenAIRE |
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