Patent ID: 8226834
Filing Date: 2012-07-24
Classification: B01D

Abstract:
1. A backwash distribution apparatus, comprising: a filter having a filter tank; a flume positioned adjacent the filter tank and in fluid communication with the filter tank and having a liquid opening for introducing backwash liquid into the flume; a first separator device positioned in the flume so as to define a first auxiliary flume between the first separator device and the filter tank, the first auxiliary flume in fluid communication with the flume and the filter tank, the first separator device having at least one flume liquid metering orifice located in the first separator device, the flume liquid metering orifice positioned to convey liquid into the first auxiliary flume during a concurrent gas/liquid backwash operation in the filter; and a second separator device positioned in the flume and spaced from the first separator device so as to define a second auxiliary flume between the first and second separator devices, both separator devices being located on the same side of the liquid opening, said second separator device extending to a height above said liquid opening; wherein during backwashing with gas, when liquid is present in the flume, a gas/liquid interface in the flume is maintained above said liquid opening.