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Big business was especially multinational in operation; small firms were increasingly backwashed by that activity in local areas.
Once the backwash step is formed, the flow separates a t the lower edge of the step, and another separation vortex is there induced.
The vortex is shown in figure 4; the sawdust on the flat bed was lifted up by the backwash vortex, not by the breaker.
The results so far described indicate that a step such as shown in figure 1 is formed due to the backwash vortex.
Most designs typically employ backwashing once per day of operation.
Relaxation and backwashing effectiveness will decrease with operation time as more irreversible fouling accumulates on the membrane surface.
By contrast with the backwash effects of out-migration, there are also potential positive or ' spread ' effects that need to be taken account of.
Reversible fouling can be removed by a strong shear force or backwashing.
Slow sand filters and self-cleaning screen filters employ mechanisms other than backwashing to remove trapped particles.
The backwash process caused detachment of biofilm from the sulfur media and relocation of the media.
The vortex is formed at the edge of the swash zone when backwash turns back into an oncoming wave bore.
Rapid sand filters must be cleaned frequently, often several times a day, by backwashing, which involves reversing the direction of the water and adding compressed air.
Whereas before backwash the biofilm thickness on the media varied greatly along the height of the reactor, it became more uniform and much thinner after the backwash.
To take on a service after the war, when there is a sort of bathos, a sort of backwash, is difficult.
We certainly cannot go back to institutionalised incomes policies, the backwash of which is now presenting such huge problems for public finance.
