Photo- and Electrochemical Water Treatment: For the Removal of Contaminants of Emerging Concern
Chapter 4: Modelling Photochemical Processes for Water Disinfection
Published:21 Dec 2022
Special Collection: 2022 ebook collectionSeries: Chemistry in the Environment
C. Casado, Á. García-Gil, M. Martín-Sómer, J. Moreno-San Segundo, J. Marugán, 2022. "Modelling Photochemical Processes for Water Disinfection", Photo- and Electrochemical Water Treatment: For the Removal of Contaminants of Emerging Concern, Halan Prakash, Rita S Dhodapkar, Kevin McGuigan
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Photochemical processes cover a wide range of technologies for drinking-water and wastewater disinfection, including UV-C, UV/H2O2, photo-Fenton, heterogeneous photocatalysis, solar disinfection, etc. They share the absorption of photons as the activation step triggering the global process. However, significant differences appear depending on the specific technology, including the required wavelength, light sources, reactor design and optimal operational conditions. This chapter focuses on the modelling strategies for the simulation and design of photochemical processes for water treatment, with particular emphasis on the use of sunlight and LED light sources. The necessity of a mechanistic description of the kinetics of the process and its explicit coupling with radiation transport in the system is shown as the best approach for the rigorous design of photochemical reactors. Application of computational fluid-dynamics techniques is also described as a way for the optimal simulation of these multiphysics processes.