PROBLEM TO BE SOLVED: To provide a liquid circulation system that can be produced, installed, and operated at a low cost.SOLUTION: A liquid circulation system comprises a lifting pipe 11 which is a long cylindrical body whose both ends are opened, and an air supply pipe 13 that supplies air. The lifting pipe 11 is installed in a liquid, and air is supplied from the air supply pipe 13 into the lifting pipe 11 to lift and circulate the liquid. The lifting pipe 11 is arranged with an air supply opening 25 of the air supply pipe 13 at a middle part thereof, and the lifting pipe 11 is installed so that both ends thereof are immersed in the liquid to lift and circulate the liquid, whereby production, installation, and operation can be performed at a low cost.SELECTED DRAWING: Figure 1
