Olive mill wastewater reuse to enable solar photo-Fenton-like processes for the elimination of priority substances in municipal wastewater treatment plant effluents

Olive mill wastewater reuse to enable solar photo-Fenton-like processes for the elimination of priority substances in municipal wastewater treatment plant effluents

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 th...

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Bibliographic Details
Published in:Environmental science and pollution research international Vol. 27; no. 30; pp. 38148 - 38154
Main Authors: Ruíz-Delgado, Ana, Roccamante, Melina Antonella, Malato, Sixto, Agüera, Ana, Oller, Isabel
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-10-2020
Springer Nature B.V
Subjects:
Agricultural wastes
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Chelating agents
Chelation
Chlorfenvinphos
Degradation
Diclofenac
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Food industries wastewaters
Iron
Municipal wastewater
Pentachlorophenol
pH effects
Research Article
Solar energy
Terbutryn
Ultraviolet radiation
Waste Water Technology
Wastewater reuse
Wastewater treatment
Wastewater treatment plants
Water Management
Water Pollution Control
Water reuse
Advanced oxidation processes
Polyphenols
Olive mill wastewater reuse
Contaminants of emerging concern
Wastewater valorization
Circumneutral pH
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Summary: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
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ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-020-09721-0