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backwash |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.04 sec. |
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backwash 1. a sucking movement of water, such as that of retreating waves 2. water washed backwards by the motion of oars or other propelling devices 3. the backward flow of air set up by an aircraft's engines backwash [′bak‚wäsh] (chemical engineering) In an ion-exchange resin system, an upward flow of water through a resin bed that cleans and reclassifies the resin particles after exhaustion. (oceanography) Water or waves thrown back by an obstruction such as a ship or breakwater. The seaward return of water after a rush of waves onto the beach foreshore. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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A new screen filter replaces the previous sand bed, thereby reducing the backwashing cleaning cycle from 90 sec to 12 sec. Today's systems eliminate the need to chemically clean and preserve the system during non-operating times extending for weeks or even a few months by periodically backwashing the R/O filter with the pure, chlorine-free water previously produced by the system. The mill also decided against using dissolved air flotation (DAF) clarifiers or backwashing pressure filters equipped with metallic filter elements. |
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