Olive mill wastewater reuse to enable solar photo-Fenton-like processes for the elimination of priority substances in municipal wastewater treatment plant effluents
| Autor: | Isabel Oller, Sixto Malato, Ana Ruiz-Delgado, Melina Roccamante, Ana Agüera |
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| Rok vydání: | 2020 |
| Předmět: |
Wastewater reuse
Health Toxicology and Mutagenesis Single step General Medicine Hydrogen Peroxide 010501 environmental sciences Reuse Wastewater Pulp and paper industry 01 natural sciences Pollution Waste Disposal Fluid Pentachlorophenol chemistry.chemical_compound chemistry Olea Environmental Chemistry Environmental science Degradation (geology) Neutral ph Effluent Oxidation-Reduction Water Pollutants Chemical 0105 earth and related environmental sciences |
| Zdroj: | Environmental science and pollution research international. 27(30) |
| ISSN: | 1614-7499 |
| Popis: | Olive mill wastewater (OMW) appears as an interesting and innovative natural alternative to synthetic chelating agents of iron in solar photo-Fenton processes at circumneutral pH due to its high polyphenol content, valorizing wastewater typically found in sunny countries. The aim of this work was the reuse of OMW for the elimination of other recalcitrant microcontaminants: terbutryn, chlorfenvinphos, diclofenac, and pentachlorophenol. Highly diluted OMW (1:1500) was employed to keep the iron in solution at circumneutral pH. Eighty percent degradation of microcontaminants was achieved, although the reaction rate was slow compared with conventional photo-Fenton process, due to Fe-polyphenol complex instability at neutral pH. At pH around 4 (considerable superior to the photo-Fenton optimal pH 2.8), Fe-polyphenol complex stability was promoted: solar UV energy required was 25 times lower to reach the objective of 80% microcontaminants degradation, which was attained in a single step, without coupling with other processes. Operating photo-Fenton at slightly acidic pH was proposed for the first time for possible reuse of treated wastewater in crop irrigation, requiring minimum pH adjustment by simply mixing it with natural wastewater. Graphical abstract. |
| Databáze: | OpenAIRE |
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