Underdrain for a filter system for filtering water or wastewater
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United States of America Patent
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Jul 7, 2015
Grant Date -
Nov 21, 2013
app pub date -
May 21, 2012
filing date -
May 21, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for use in a filter system for filtering water or wastewater. The apparatus includes at least one underdrain lateral. The at least one underdrain lateral has at least an inner chamber, a first outer chamber and a second outer chamber. The first outer chamber and the second outer chamber are preferably in fluid communication with the inner chamber. The inner chamber, the first outer chamber and the second outer chamber are preferably formed by an inner liner and an outer liner. The outer liner is a separate piece from the inner liner and surrounds the inner liner. The inner chamber is preferably configured to simultaneously receive a liquid and a gas during a washing procedure including simultaneous use of a liquid and gas to clean a filter bed to create a liquid and gas interface in the inner chamber.
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