A device for creating circulation within a body of liquid, and an apparatus for treating sewage or the like in a body of liquid

摘要

An apparatus is provided for causing circulation within a large standing body of fluid, for a body of liquid containing sewage. The apparatus comprises a large-bubble generator (20) exposed to the pressure of the fluid at a predetermined level, a vertically extending standpipe (18), an inverted siphon (23) between the standpipe (18) and the generator, and a transverse connection (15) between the standpipe (18) and a vertically extending stackpipe (13). Upon generating a large gas bubble into the stackpipe (13), the gas acts as a piston within the stackpipe (13), pushing liquid upwardly therethrough, and thereby drawing liquid into the bottom. The continuous passage of such large bubble through the stack-pipe (13) results in a current flow circulation through the large standing body of liquid. The generator can be placed at a position beneath the surface of the standing body of liquid a distance limited only by the rapidity at which a large bubble can be generated, as it is desirable that in steady state operation, a large bubble enter the stackpipe before the preceding large bubble has exited from the top.