| 摘要 |
A device for simultaneously aerating and chemically treating lakes to prevent or retard the process of eutrophication in the lake waters. The device has a venturi outlet passage for the discharge of a pressurized stream of water and a venturi inlet chamber spaced upstream of the outlet passage, as well as a mixing chamber in which air and treating chemicals can be turbulently ingested into the stream. The device is positioned underwater for use with an open line extending from the mixing chamber to a point above the water surface. A nozzle is attached to the venturi outlet passage. This nozzle has a pair of side openings to draw water into the stream passing through the outlet passage to give the stream greater density and turbulence as it leaves the nozzle. Also, the venturi outlet passage has three communicating chambers with walls shaped to create turbulence in the stream even before it reaches the nozzle. To operate the device, pressurized water is pumped into the venturi inlet chamber to create a partial vacuum in the mixing chamber that sucks air into that chamber through the line connecting it with the atmosphere. A treating chemical such as copper sulfate can be charged into the open upper end of the line for ingestion in the stream of water passing through the device at the same time as air is being sucked through the line.
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