Gas-liquid distribution technique for water or wastewater filters using underdrains
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United States of America Patent
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Jul 17, 2018
Grant Date -
Jun 19, 2014
app pub date -
Dec 16, 2013
filing date -
Dec 17, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A method of distributing gas and liquid through an underdrain system includes: a) positioning an underdrain system on a filter floor, the underdrain system comprising at least one underdrain block and filter media positioned on top of the underdrain block; b) distributing gas sufficiently evenly through the underdrain system at a rate of less than 2 scfm/ft2 by distributing a liquid at a rate of less than 2 gpm/ft2 concurrently with the gas; c) increasing the distribution rate of the liquid, or increasing the distribution rate of the liquid and the distribution rate of the gas; d) stopping the distribution of gas; e) further increasing the distribution rate of the liquid; and f) decreasing the distribution rate of the liquid. A method of distributing gas and liquid during an upflow filtration mode is also included.
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