Removal of contaminants of emerging concern by continuous flow solar photo-Fenton process at neutral pH in open reactors

Journal of Environmental Management
S ArzateJ A Sánchez Pérez

Abstract

For the first time, the operational feasibility of the solar photo-Fenton process at neutral pH in continuous flow has been tested for three consecutive days. The aim of the treatment was to remove of contaminants of emerging concern (CECs) from wastewater treatment plant secondary effluents. To this end, a 5 cm-deep raceway pond reactor was run in continuous flow mode and the degradation of the CECs present in real secondary effluents was monitored at their natural concentrations. To keep dissolved iron at neutral pH, ethylenediamine-N,N'-disuccinic acid (EDDS) was used to form the complex Fe(III):EDDS as an iron source for the photo-Fenton reactions. At pilot scale the effects of the Fe(III):EDDS molar ratio (1:1 and 1:2) and hydraulic residence time (HRT) (20 and 40 min) on CEC removal were studied. The best operating condition was 20 min of HRT, giving rise to a treatment capacity of 900 L m-2 d-1 with CEC removal percentages of around 60%. The reactant concentrations were 0.1 mM Fe(III):EDDS at a 1:1 M ratio and 0.88 mM H2O2. Under these operating conditions, the short-term stability of the process was also demonstrated, thus pointing out the potential of this solar technology as a tertiary treatment.

References

Mar 18, 2017·Environmental Research·Nikolaos I RousisSara Castiglioni

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Citations

Oct 17, 2020·Environmental Science and Pollution Research International·Ana Belén Esteban GarcíaJosé Antonio Sánchez Pérez
Mar 3, 2021·Journal of Environmental Management·Lorenzo HernándezDomingos Barbosa
Jul 16, 2021·Environmental Science and Pollution Research International·Lis Manrique-LosadaRicardo A Torres-Palma

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