Double (or three)-layer ultrasonic-assisted cavitation ozone heterogeneous catalytic oxidation wastewater treatment device and manufacturing method

The invention relates to a double (or three)-layer ultrasonic-assisted cavitation ozone heterogeneous catalytic oxidation wastewater treatment device. The device comprises a power supply, an ultrasonic source, a raw water tank, a catalytic oxidation tower, a backwashing fan, an ozone generator, a clear water tank and a tail gas destructor; the ultrasonic source is connected to the power supply; the catalytic oxidation tower comprises an upper packing layer and a lower packing layer, and a middle water inlet and outlet device is arranged between the upper packing layer and the lower packing layer; and a secondary water distribution device is positioned on a secondary water distribution plate supporting layer. The device has the beneficial effects that as the retention time has great influence on the catalytic oxidation removal rate, the height of a single catalytic filler layer of the oxidation tower is not designed to be too high due to backwashing, or otherwise, an ultra-large-flow backwashing pump needs to