| 摘要 |
This invention provides a method of and apparatus for the deep bed filtration of a liquid containing fine particles (generally on the order of less than 0.005 inches) to obtain an effluent of exceptional clarity. It has been discovered that filtration to this degree of clarity requires a compacted filter medium bed and that this bed compactness must be preserved during rejuevenation of the bed to avoid the dispersal of previously removed dirt particles throughout the filter medium. In this invention, the rejuevenation of the bed is carried out by the flow of liquid through the bed in the same direction as the direction of filtration, but at a flow rate at least twice the flow rate during filtration, while maintaining the configuration and compactness of the bed during both filtration and rejuevenation.
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