| 摘要 |
Disclosed is a decanter device for use to withdraw supernatant liquid from a reactor tank containing a mixture of liquids of different densities or a liquid mixed with solid particles to be separated. The device comprises a perforated pipe mounted inside the tank. The pipe has a plurality of inlets in the form of small orifices opening into the tank, and at least one outlet leading out of the tank. An inflatable membrane is mounted inside the pipe in such a manner as to extend over the small orifices and sealingly close the inlets of the pipe when it is inflated, and to extend away from the small orifices and away from the outlet to allow supernatant liquid to flow out of the tank through the pipe when the membrane is not inflated. A source of air or water under pressure is used for inflating the membrane whenever desired to sealingly close the inlets of the pipe and thus prevent liquid or solids to penetrate in the pipe during reaction within the reactor tank. This device is particularly useful for biological wastewater treatment reactors.
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