Abstract
The ultraviolet photochemical degradation process is widely applied in wastewater treatment due to its low cost, high efficiency and sustainability. In this study, a novel rotating flow reactor was developed for UV-initiated photochemical reactions. The reactor was run in a continuous flow mode, and the tangential installation of the inlet and outlet on the annular reactor improved reaction rates. Numerical modelling, which combined solute transport, radiation transfer and photochemical kinetic degradation processes, was conducted to evaluate improvement compared to current reactor designs. Methylene Blue (MB) decomposition efficiency from the modelling results and the experimental data agreed well with each other. The model results showed that a rotational motion of fluid was well developed inside the designed reactor for a wide range of inflow rates; the generation of ·OH radicals significantly depended on UV irradiation dose, and thus the degradation ratio of MB showed a strong correlation with the UV irradiation distribution. In addition, the comprehensive numerical modelling showed promising potential for the simulation of UV/H2O2 processes in rotating flow reactors.
Highlights
Advanced oxidation processes (AOPs) such as photochemical oxidation, Fenton oxidation and ozone oxidation have unique superiority in degrading refractory organic contaminants in wastewater
Addition of UV energy in the presence of H2O2 is an advanced oxidation process (AOP); when UV radiation is absorbed by H2O2, the molecule splits apart into two OH radicals, which makes much of the micropollutant oxidation occur
The H2O2 concentration was high near the wall of the reactor
Summary
Advanced oxidation processes (AOPs) such as photochemical oxidation, Fenton oxidation and ozone oxidation have unique superiority in degrading refractory organic contaminants in wastewater. (UV)/hydrogen peroxide (H2O2) technique, which combines the advantages of UV and H2O2 methods, is becoming an attractive alternative for the degradation of organic contaminants that are difficult to remove by conventional water treatment processes. The UV-type AOPs have been widely applied in the disinfection process of drinking water, and research is being conducted to optimize the reactors for the disinfection procedure, some of which have been commercialized. Few studies report optimization of the reactor design for wastewater treatment. Treatment of wastewater normally requires a long residence time for removing relatively high concentrations of pollutant species, and a suitable reactor shape enabling
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