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Continuous flow solar photo-Fenton process has been carried out at demonstration scale at flow rates up to 18 m3 h−1 as an advanced treatment for the removal of contaminants of emerging concern, CECs. A 100-m2 raceway pond reactor, RPR, has been built in the WWTP of Almeria city, Spain. The fluid dynamics study showed plug-flow in the reactor channels and perfect mixing in the bends and paddlewheel sections, giving rise to long mixing times. Consequently, for CEC removal the RPR was operated in continuous flow mode at 1 h of hydraulic residence time and acidic pH, with 0.1 mM FeSO 4 and 1.47 mM H 2 O 2. Liquid depth was set at 10 cm in winter and 18 cm in summer, achieving > 85% of CEC removal in both cases. For the first time, CEC removal by solar photo-Fenton has been demonstrated under real operational conditions paving the way for its commercial application. [Display omitted] • The solar photo-Fenton process has been implemented at large scale for CEC removal. • More than 85% CECs were removed from secondary effluents in a 100-m2 RPR. • 144 m3 day−1 operating 8 h day−1 with 18 cm of liquid depth at 60 min of HRT. • Kinetics and RPR flow pattern play an important role when scaling up the process. [ABSTRACT FROM AUTHOR]

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