Samples were taken at the reactor outlet. The generator unit
(Fig. 2b) was used for transducer power generation and for controlling the motor speed of the horizontal stirrer inside the reactor. The
rectangular shape (2.52.530 cm) stainless steel (316) reactor
is shown in Fig. 2c. There were two different transducer frequencies used in the experiments (20 and 50 kHz) and the location of
transducers was fixed along the length of the reactor, as shown
inFig. 1. The frequency of the transducers anchored to the reactor
wall on opposite sides was the same. The generator provided a
power of 50 W per transducer, hence, the total power of this reactor was 800 W when operating with all 16 transducers. This reactor
can be operated in 3 modes; the mechanical stirred mode using the
horizontal stirring rod inside the reactor with the maximum speed
of 25 rpm (MS reactor), ultrasound irradiation (US reactor) and the
integration of mechanical stirring and ultrasound irradiation
(MS–US reactor)