Energy Efficiency of AOP

In order to evaluate energy efficiency of a radiation-based AOP, a figure of merit (EE/0) for the consumption of electrical energy is calculated according to the following equation (35)  

High EE/0 values would correspond to low energy efficiency of a system. 

As mentioned earlier, UV/oxidation AOP is more commonly used in environmental applications and, by far, they are the least expensive of all the AOP. Goel et al. (12) compared sonication and UV/oxidation AOP, and concluded that in order to be energy efficient, the present ultrasonic degradation rates need to be improved by at least 10-100 times, especially for the non-volatile compounds (12). UV/oxidation costs generally are 

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