Abstract
UV chemical degradation is a low-cost and sustainable wastewater treatment technology that protects the environment. In this study, computational fluid dynamics (CFD), mass transfer, and photochemical kinetic models combined with the continuous flow mode of UV/H2O2 were applied for the photochemical reaction of internal airlift circulation photocatalytic reactor to improve the efficiency of the reaction. Results show that with the increase in gas flow rate, the turbulence intensity and internal circulation effect of liquid in the reactor can be enhanced under the condition of constant baffle spacing. The CFD simulation prediction results of the chemical components in the liquid flow show that H2O2 has a high correlation with the OH radical formation, which depends on the intensity of UV. Thus, the degradation rate of methylene blue (MB) has a high correlation with UV intensity. The degradation efficiency of MB is improved with the increase in gas velocity by comparing the experimental data with the numerical simulation data. The experimental data are generally lower than the numerical prediction data, and although a certain difference range is observed, the overall prediction results are better.
Highlights
Advanced oxidation processes (AOPs) is a cost-effective solution for removal of harmful and refractory pollutants from water
Based on the principles of conservation of mass and momentum, a two-dimensional computational fluid dynamics (CFD) model was developed to calculate the local hydrodynamics in photoreactor, and the phasic volume fraction α must satisfy the relation: n αi = 1 (1)
The internal airlift circulation photoreactor uses air as the driving force to enable the liquid to circulate continuously in the reactor without mechanical stirring and water pump to achieve the purpose of full mixing
Summary
Advanced oxidation processes (AOPs) is a cost-effective solution for removal of harmful and refractory pollutants from water This method is preferred and ideal in the field of water treatment and air purification. The air lift internal circulation photoreactor uses air as the driving force to realize the internal circulation flow of water in the reactor This photoreactor can realize the full mixing of substances in the fluid without mechanical stirring and pump lifting. It is widely used in various fields, such as in biology, environment, and chemical industry, because of its simple structure and low energy consumption [3,4]
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