Water body decontamination system and application thereof

The invention relates to a water body decontamination system and an application thereof, wherein the system can improve dirt removing effect, and can meet energy saving, emission reduction and consumption reduction requirements; the system comprises a gas generator arranged in a pond and used for continuously forming gas, and a water lift pipe arranged above the gas generator; the water body decontamination system is applied in pond decontamination. Compared with the prior art, the advantages are that the system can use a sewage pond to settle and recoil solid dirt such as residual feeds and night soils formed in the culture process, or can use a filter net or an air floatation to gather the dirt and discharge same; less dirt-pulling is combined to remove heavy solid objects such as largehard particles and residual feeds, thus realizing excellent decontamination effect, and removing more than 90% of culture night soil; the system uses very limited water consumption and energy consumption in decontamination, t