Device and method for recycling and treating drilling and completion waste liquid through ultrasonic technology

The invention provides a device and method for recycling and treating drilling and completion waste liquid through ultrasonic technology. The device comprises a shell, and is characterized in that an inclined baffle is arranged in the shell and divides the shell into a cavitation air flotation area and a photocatalytic oxidation area; a slag scraping plate, a slag discharging groove and a slag discharging pipe are arranged at the top of the shell; an inclined plate filter and a water outlet pipe are arranged at the lower part of the photocatalytic oxidation area; and a photocatalytic partition plate and an ultraviolet light tube are arranged in the photocatalytic oxidation area. The device has the advantages that a hydrodynamic cavitation device and an ultrasonic cavitation device are integrated, so that the problem of instability of tiny bubbles generated by an air flotation device is solved. According to the device and method, hydrodynamic cavitation, ultrasonic wave, ozone catalysis and photocatalysis tech