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Liquid Purification

Filtration-system-and-flow-control-method-therefor

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Filtration system and flow control method therefor

Details

Inventors: Morey, Edward F.;
Assignee: The Taulman Company (Atlanta, GA)
Primary Examiner: Adee; John
Assistant Examiner:
Attorney, Agent or Firm: Berman, Aisenberg & Platt

A method and apparatus for controlling the operation of gravity or pressure filters in a filtration system. A bank of filter beds are provided for removing suspended solids from the fluid medium which are fed to the filters via a common inlet conduit. Each of the filters has an associated effluent conduit which, in turn, has a throttling device positioned therein controlling the rate of flow of the fluid medium through the respective filter. A differential pressure transmitter is provided for each filter bed to measure the differential fluid pressure thereacross and to provide an output analog signal proportional thereto. A control device generates a control signal in response to the output from the differential pressure transmitter and a set point signal representing the desired differential pressure. The control signal is utilized to vary the throttling device in the effluent conduit and, consequently, to bring the measured differential pressure across the filter bed in line with the desired differential pressure. A common set point signal is provided for the entire bank of filters by means of a level or pressure sensor positioned in the common inlet conduit. In this manner, each filter operates at a different flow rate but at the same differential pressure across the filter and responds to both varying influent flows and effluent flows so as to minimize the differential pressure loss thereacross.

DETAILED DESCRIPTION A primary object of the present invention is to provide a novel and unique system and method for controlling the flow of water through gravity or pressure filters for the removal of suspended material from water and waste water in treatment plants.
Another object of the present invention is to provide a novel and unique system for controlling the flow of a fluid medium through a plurality of filters provided for removing suspended solids from the fluid medium which incorporate the advantages of the declining rate method of flow control with the added advantages of fixed level operation without the concomitant disadvantages of the constant rate or constant level flow control techniques.
A still further object of the present invention is to provide in a system for controlling the flow of a fluid medium through a plurality of filter means for ensuring that the total flow produced by all filters is equal to the total flow being applied to the filters from the secondary treatment effluent.
An additional object of the present invention is to provide a process for controlling the flow of water or waste water through a filtration system which takes into account variations in flow in both the influent and effluent conduits.
A still further object of the present invention is to provide in a flow control method for a filtration system means for automatically limiting the differential pressure across individual filter beds so as not to exceed a predetermined maximum during a portion of the filter cycle.
An additional object of the present invention is to provide a system for controlling fluid flow through a plurality of filters in which the filters operate at individually different flow rates so as to produce the least differential pressure loss across the filter bed.
The foregoing and other objects are achieved in accordance with one aspect of the present invention through the provision of a system for controlling the flow of a fluid medium through a plurality of filters provided for removing suspended solids from the fluid medium

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