External air flotation system for oilfield produced water

The utility model provides an external air flotation system for oilfield produced water. The external air flotation system comprises a bubble generating device and an air flotation device, the bubble generating device comprises a tank body; a water outlet is formed in the top of the tank body and is connected with a water inlet of the air flotation device, and a release mechanism for releasing gas in the oilfield produced water is arranged at the bottom in the tank body; a water inlet of the release mechanism is formed in the outer wall of the tank body. The external air flotation system for the oilfield produced water can effectively remove associated natural gas in the oilfield produced water and form bubble water, and the bubble water enters the air flotation device to further remove oil and suspended matters in the produced water, so that the quality of the produced water and stable operation of a subsequent treatment process are realized. 本实用新型提供了一种用于油田采出水的外置式气浮系统，包括气泡产生装置以及气浮装置；气泡产生装置包括罐体；罐体顶部设有出水口，出水口与