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Tratamento de águas residuais da indústria corticeira por processos combinados foto-fenton solar/oxidação biológica
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pintor, Ariana M. A. |
| Copyright Year | 2010 |
| Abstract | Portugal is the world leader in cork industry, so the development of solutions for the environmental problems posed by this industry makes sense, especially for wastewaters, which are produced during cork boiling and bleaching of stoppers processes. This study focused on the possibility of treating cork boiling wastewater by solar photo-Fenton using cork bleaching wastewater as a H2O2 source. The cork boiling wastewater has a high organic load, with a high concentration of recalcitrant compounds, such as polyphenols and tannins; the cork bleaching wastewater has a high hydrogen peroxide concentration and a moderate organic load. Both wastewaters are hard to biodegrade, so a variety of treatments have been researched as an alternative to conventional biological treatment: coagulation/flocculation, membrane separation, and Advanced Oxidation Processes (AOPs). AOPs are chemical oxidation processes in which the oxidizing agent is the hydroxyl radical. There are several methods for the production of this agent. In cork wastewater treatment, photo-Fenton using solar light is the AOP which presents better results reported in the literature. Solar photochemical processes are advantageous in Portugal because they use an abundant source of renewable energy, especially in Summer. The photo-Fenton kinetics was evaluated at different iron concentrations. All the kinetic studies showed a mineralization higher than 80%. The optimum catalyst concentration obtained was 60 mg Fe/L, achieving 91% mineralization and consuming 16.6 kJUV/L and 116.8 mM of H2O2. The Zahn-Wellens test pointed a DOC of 229.0 mg/L as the optimum phototreatment time to reach a biodegradable effluent, corresponding to an energy dose of 13.6 kJUV/L, consuming 76.1 mM of H2O2, which is approximately 8.5 L of cork bleaching wastewater for each 15 L of cork boiling wastewater. The cost of solar photo-Fenton treatment until the optimum phototreatment time, for the industrial wastewaters studied (4,2 m/day) varies between 5 and 8 €/m, for a CPC area between 61 m (Alentejo) and 67 m (Porto). A biological process was predimensioned to couple with the photocatalytic treatment. The proposed treatment was efficient, presenting both environmental and economical advantages, through the use of renewable energy and the economization of reactants. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio-aberto.up.pt/bitstream/10216/59140/1/000147495.pdf |
| Alternate Webpage(s) | https://www.apda.pt/site/upload/Ariana%20Pintor.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
