backwash

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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Previous studies have proven the significance of backwashing and QQ techniques for reducing biofouling separately.
[TSS.sub.DRi]--concentration of total suspended solids (mg [L.sup.-1]) present in a 60 mL sand sample from the filtering layer i after backwashing.
Accurately measuring the turbidity of the water coming out of the filter is the best way to determine when backwashing should occur, optimising drinking water plant performance and minimising operating costs.
I have had good quality filtrations going from red wine to blush wine after backwashing.
* Backwashing System: Traditionally, the filter medium is made from fine granulometries that allow for an effective filtration process, but this has the disadvantage of requiring frequent backwashing operations (and consequent filtering interruptions).
During the backwash process, the media bed will become fluidized and if proper attention is not paid to the compatibility of the sand with the GAC, intermixing and ineffective backwashing will occur.
In a backwashing filter however the bag is positioned between internal and external support cylinders.
* Backwashing after media installation until the sight glass is clear
The range of Ronningen-Petter AFR Series automatic internal backwashing filter systems has been extended with the introduction of 152mm diameter tubular filter bodies.
Instead of random or scheduled filter backwashing, backwashing operations now occur only when various parameters are reached.