UV-C assisted disinfection processes are among the well-known tertiary processes for water reuse, wastewater reclamation and domestic water disinfection. However, treated wastewaters normally contain several organic compounds and pollutants that can be partially degraded under UV-C irradiation to different by-products, often more toxic than their parent compounds, and/or, for longer treatment times, completely mineralized. For this reason, kinetic modeling of pollutants degradation in UV-C assisted processes is of crucial importance in plants design. This work aims to the characterization of a reactor configuration consisting of 6 lamps placed following a symmetric hexagonal geometry. Specifically, a mathematical model is proposed to estimate the mean optical length and degradation kinetics for UV-C and UV-C/H2O2 processes. The model has been tested with different reference organic compounds and represents a significant characterization of a modular geometric unit used in a great variety of applications. Finally, the characterized reactor was used to estimate the quantum yield of direct photolysis at 254 nm (Φ254 CPC=(8.04±0.36)·10-3mol·ein-1) and kinetic constant of reaction with hydroxyl radical of cetylpyridinium chloride (CPC) ((1.11±0.0778)·109L·mol-1·s-1), an emerging pollutant of wide interest. © 2018 Elsevier B.V.

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