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Filtration Glossary
 
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  RATED FLOW
  Normal operating flow rate at which a product is passed through a housing; flow rate which a housing and medium are designed to accommodate.
   
  RECOVERY
  Ability of a filter to recover bacteria (or other defined particles) from a solution. In Membrane Filtration Technique, expressed as percent of bacteria originally present or observed on a comparable pour plate.
   
  REENTRAINMENT
  Process of rendering particles airborne again after they have been deposited from an airstream. Example: particles captured in a filter may be reentrained if the velocity through the filter is increased slightly or if the filter is subjected to increased vibration.
   
  RESIDUE
  Solids deposited upon the filter medium during filtration in sufficient thickness to be removed in sheets or sizable pieces. Sometimes referred to as cake or discharged solids.
   
  RETENTION
  Ability of a filter to retain particles (total number or those of a specific size) suspended in a gas or liquid. Expressed as a precentage of particles originally present.
   
  RETENTION VOLUME
  See the Hold up Volume.
   
  RETURN FLOW
  The concentrate which is returned to the head of the process for further processing.
   
  REUSABLE
  Element which may be cleaned and used again. Opposited of disposable or replaceable.
   
  REVERSE OSMOSIS (RO)
  A filtration separation method (usually crossflow or stirred cell type) operating at 200-1500 psi to overcome osmotic pressure. Pore sizes are typically in the order of 10 -10 meters (107mm). Efficiency is usually described in terms of percent salt rejection with 90% being common.
   
   
   
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 
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