The present invention relates to a supersaturated dissolved
oxygen device and method, the device comprising: a water inlet
pipe, a water inlet is provided at the first end thereof, a
submersible pump and / or a self-priming pump is provided on the water inlet
pipe to extract polluted water into the water inlet
pipe; a reactor, which is connected to the second end of the water inlet pipe to be in fluid communication with the water inlet pipe, the reactor is in fluid communication with the
oxygen source gas through an
oxygen delivery pipe, and an air
inlet valve is provided on the
oxygen delivery pipe; a water outlet pipe, which is provided with a water outlet
ball valve, the first end of the water outlet pipe is connected to the reactor, and an
inverted U-shaped pipe is provided on the water outlet pipe; and a
reflux pipe, which is provided with a pipeline pump, the first end of the
reflux pipe is connected to the highest point of the
inverted U-shaped pipe to be in fluid communication with the
inverted U-shaped pipe, and the second end of the
reflux pipe is connected to the water inlet pipe to be in fluid communication with the water inlet pipe, so that a part of the water in the water outlet pipe flows back to the reactor through the water inlet pipe to pressurize the reactor. The present invention can improve the
oxygenation efficiency, thereby improving the level of dissolved oxygen.