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rapid sand filtration
At three of four drinking water production plants tested, rapid sand filtration decreased the number of aeromonads and hygienic indicator organisms.
      
Exceedances are allowed up to 200 and 50 particles/mL for a cumulative 15 minutes for rapid sand filtration and membrane filtration, respectively.
      
Filtering Myxobolus cerebralis triactinomyxons from contaminated water using rapid sand filtration.
      
In particular, chlorination and slow and rapid sand filtration contributed significantly to such a rapid reduction.
      
Rapid Sand Filtration Rapid sand filtration has largely replaced slow sand filtration over the past 100 years.
      
Rapid sand filtration backwash cycles often incorporate an air scour for added agitation of the filter bed and increased cleansing action.
      
Slow sand filtration is mechanically simple in comparison to rapid sand filtration but requires a much larger filter area.
      
Sludge samples were taken only at ten treatment plants with a rapid sand filtration system.
      
Surface fresh waters will often undergo coagulation, sedimentation, rapid sand filtration and disinfection.
      
Ten treatment plants adopt a rapid sand filtration system, whereas the other one treatment plant adopts a slow sand filtration system.
      
There is a tendency to abandon the old plants and substitute the same with Rapid sand Filtration plants.
      
The treatment and disposal of the backwash water is a major consideration during site selection and designing of rapid sand filtration facilities.
      
The stormwater is pumped from the trap, pond, or tank through the filtration system in a rapid sand filtration system.
      
 

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