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Method and apparatus for enhancing filter bed performance
| Details |
Inventors: Chilcote, Dennis; Gratz, Mike S.; Clifford, Robert; Mills, John; Vineretsky, Gregory; McGraw, Daniel; Dunn, Alan; Dabbs, Bobby; Mars, Karie;
Assignee: NBE, LLC (Anna Maria, FL)
Primary Examiner: Upton; Christopher
Assistant Examiner:
Attorney, Agent or Firm: Pedersen & Co., PLLC, Pedersen; Ken J., Pedersen; Barbara S.
In a vessel containing a filter bed and containing a mixed liquor containing suspended solids, a system disturbs/dislodges a sludge mat that settles on the filter bed. Thus, the system controls the sludge mat on the filter bed that otherwise may blind the filter bed and significantly reduce or stop process liquid flow into and through the filter bed. The system helps maintain effective vessel effluent flowrates with reduced requirements for filter bed backwashing or other filter bed maintenance. The system includes a sludge mat dislodging member that moves along the filter bed surface, preferably on but substantially not inside the filter bed, to disrupt/dislodge the sludge mat and/or prevent formation of the sludge mat. Preferably, the dislodging member is carried inside the vessel on a moving arm or arms that rotate in a plane parallel to the filter bed surface. The preferred sludge mat dislodging member(s) hang from the rotating arm(s) to slide along the top of the filter bed through the sludge mat. The sludge mat control methods and apparatus preferably are used during normal operation of the reactor/vessel, without requiring shutdown or interruption of the process. The methods and apparatus may be effective in sludge blanket microbial remediation reactors that require high flowrates of liquid effluent due to low residence times in a given vessel. |
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DETAILED DESCRIPTION The present invention comprises methods and apparatus for improving operation of a filter bed in a microbial remediation reactor, a filtration vessel, or other process vessel.
The invented method and apparatus provide for reducing, dislodging, or otherwise controlling the process solids that settle on the filter bed, especially in down-flow operations as liquid is flowing through the filter bed to be withdrawn from below/in the filter bed.
The invented method and apparatus comprise dislodging the process solids that settle on top of the filter bed, to prevent the solids from "blinding" the filter bed to an extent that slows flow into the filter bed an unacceptable amount or that stops flow into the bed.
In some embodiments, the settled solids may serve as the top layer of a dual-media filtration system comprising the solids and the filter bed, so that controlling the settled solids by a renewal step, rather than completely eliminating the settled solids, may optimize filtration and biomass retention.
In the preferred embodiments, a dislodging member is moved along the top of the filter bed to dislodge at least a portion of the settled process solids and uncover at least a portion of the filter bed top surface.
This uncovering step allows the process liquid to access the filter bed, so that the liquid may flow through the filter bed as intended.
By utilizing the invented method and/or apparatus, flow is maintained through the filter bed until the filter bed itself is restricted or plugged by solids in the voids in the filter bed.
This way, the filter bed capacity is the limiting factor in requiring back-washing of the filter bed or a shutdown for clean-out, rather than the typically quick-settling solids that form the "blinding" mat on top of the filter bed.
The invented methods and apparatus may be used in many process and unit operation vessels.
There may be a process taking place in the vessel above the filter bed, such as a chemical reaction or microbial process, or, alternatively, filtration through the subject filter bed may be the only operation taking place in the vessel
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