Abstract
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.
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Funding
The authors wish to thank the Spanish Ministry of Science, Innovation and Universities (MCIU), AEI, and FEDER for funding under the CalypSol Project (Reference: RTI2018-097997-B-C32). Ana Ruiz Delgado wish to thank the Junta de Andalucía (Andalusian Regional Government in Spain) (RNM-1739) and the European Regional Development Fund (ERDF) for funding this investigation.
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Ruíz-Delgado, A., Roccamante, M.A., Malato, S. et al. Olive mill wastewater reuse to enable solar photo-Fenton-like processes for the elimination of priority substances in municipal wastewater treatment plant effluents. Environ Sci Pollut Res 27, 38148–38154 (2020). https://doi.org/10.1007/s11356-020-09721-0
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DOI: https://doi.org/10.1007/s11356-020-09721-0