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US 7,921,697 B2Granted
Method and apparatus for monitoring an underdrain of a filter system
AssigneeRG Delaware, Inc.
InventorR. Lee Roberts
Life of this patent
Estimating the term…
Abstract
A method and apparatus for monitoring an underdrain in a filter system for filtering water or wastewater. At least one diagnostic condition relating to the performance of the underdrain is monitored to determine if the underdrain is operating in an acceptable manner.
Claims20
A filter system for filtering a liquid, comprising:
- (a) a filter bed having at least one layer of filter media for removing impurities from a liquid passing through said filter bed;
- (b) an underdrain operably associated with said filter bed for directing a fluid through said filter bed during a washing cycle to remove impurities retained in said filter bed during a filtration cycle;
- (c) a first sensor for sensing at least one diagnostic condition relating to flow of the fluid through said underdrain;
- and,
- (d) a controller for evaluating the at least one reading of said first sensor to determine whether the flow of fluid through said underdrain is within a predetermined acceptable level.
2 more elements
A filter system as recited in 4, further including:
- (a) a controller for evaluating at least one reading of said first sensor and at least one reading of said second sensor to determine whether the flow of fluid through said underdrain is being obstructed.
A filter system for filtering a liquid, comprising:
- (a) a filter bed having at least one layer of filter media for removing impurities from a liquid passing through said filter bed;
- (b) an underdrain operably associated with said filter bed for directing a washing fluid through said filter bed during a washing cycle to remove impurities retained in said filter bed during a filtration cycle;
- and,
- (c) a monitoring means for monitoring said underdrain to determine whether said underdrain is performing at a predetermined acceptable level.
1 more element
A filter system as recited in 7, wherein:
- (a) said monitoring means includes a pressure gauge for measuring pressure of a washing fluid, said pressure gauge being disposed upstream of a top surface of said underdrain relative to a direction of flow of the washing fluid.
A filter system for filtering a liquid, comprising:
- (a) a filter bed having at least one layer of filter media for removing impurities from a liquid passing through said filter bed;
- (b) an underdrain operably associated with said filter bed for directing a fluid through said filter bed;
- and,
- (c) a pressure gauge for measuring pressure of the fluid, said pressure gauge being disposed upstream of a top surface of said underdrain relative to a direction of flow of a washing fluid.
1 more element
A filter system for filtering a liquid, comprising:
- (a) a filter bed having at least one layer of filter media for retaining impurities in a liquid to be filtered;
- (b) an underdrain operably associated with said filter bed for directing a fluid through said filter bed;
- and,
- (c) a monitoring unit for monitoring differential pressure across two vertically spaced points of said underdrain to determine whether said underdrain is performing acceptably.
1 more element
Dependencies are inferred from the claim text.