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Enhancing disinfection and microcontaminant removal by coupling LED driven UVC and UVA/photo-Fenton processes in
Alam G Trovó1, María Guadalupe Pinna-Hernández2, Paula Soriano-Molina2
1Solar Energy Research Centre (CIESOL), Joint Centre University of Almeria-CIEMAT, Ctra. de Sacramento s/n, Almería 04120, Spain; Universidade Federal de Uberlândia, Instituto de Química, 38400-902 Uberlândia, MG, Brazil.
Abstract:
For the first time, the sequential combination of UVC-LED (276 nm) and photo-Fenton/UVA-LED (376 nm) process has been assessed in continuous flow mode for wastewater reclamation according to the new European Regulation for reuse in agricultural irrigation (EU 2020/741). The results show that it is possible to obtain water quality class B (Escherichia coli ≤ 100 CFU/100 mL) by UVC-LED irradiation alone, operating the system with a hydraulic residence time (HRT) of 6.5 min and liquid depth of 5 cm in the case of secondary effluents with low Escherichia coli load (8.102-3.1.103 CFU/100 mL). As for high bacteria concentrations (1.2-4.2.104 CFU/100 mL), HRTs longer than 30 min are required. The bacterial load has not influenced decontamination, removing 18 ± 4 % of microcontaminants. Coupling the UVC (30-min HRT and 5.0 cm liquid depth) and the UVA/photo-Fenton (60-min and 15-cm liquid depth) systems allows 58 ± 4 % of real organic microcontaminants to be removed, in addition to achieving water quality class B.
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