Статті та тези

The review provides a systematic understanding of the mechanism of the sonochemical degradation of phenol. It was shown that the main contribution to the sonochemical degradation of phenol, a hydrophilic non-volatile wastewater component, is related to hydroxylation on the boundary of the «cavitation bubble–water contaminant solution». Depending on the method of generating hydroxyl radicals, all wastewater treatment methods for phenol removal based on advanced oxidation processes are classified into the following categories: chemical (acoustic and hydrodynamic cavitation, use of oxidants, Fenton process, and Fenton-like processes), photochemical (photolysis and photocatalysis), electrochemical and combined techniques. The essence of these methods is revealed and their main advantages and disadvantages are reviewed. It is shown that the efficiency of combined methods of phenol degradation that are based on the use of cavitation (acoustic or hydrodynamic) depends on the power of ultrasonic emitters, the frequency of ultrasonic vibrations, the magnitude of the pressure at the inlet of the hydrodynamic cavitator, physicochemical properties of media (temperature and pH), initial phenol concentration in aqueous medium, the design features of the cavitation generators, the presence of water-soluble gases or solid particles that exhibit catalytic properties, and the consumption of oxidizing reagents. Literature data showed that the most cost-effective method involving the use of ultrasonic cavitation is a combination «ultrasonic cavitation+photolysis+ozonation». The choice of a particular method for the degradation of phenol is determined by its content in wastewaters and their volume, the required degree of degradation, the duration of the purification process (the rate of degradation of the phenol), and economic indicators.

Статті та тези

Browse

Filters

Settings

Sort By

Results per page

Search Results