Filtration I – Determining Filterability of Suspensions

  • Cecilia Hodúr
Part of the Integrating Safety and Environmental Knowledge Into Food Studies towards European Sustainable Development book series (ISEKI-Food, volume 5)

Objectives and Learning Outcomes

  1. 1.

    Examine and determine the filterability of different suspensions (e.g., waster water, sludge).

  2. 2.

    Discuss and evaluate the effectiveness of preliminary treatments (e.g., flocculation, adsorption, polyelectrolytes, sedimentation).



Waste water which has suspended materials could be removed from water by simple filtration, which is filtration an especially effective unit operation in the removal of very small particles, like microorganisms. These filters could be used as a bio-reactor in waste treatment. The waste filtration process is usually performed using a medium such as sand or anthracite coal.

Filterability is not a specific property of a suspension, but it is an interactive property between a suspension and some filter media. If the properties of one of these are kept constant (i.e., as a standard filter medium) the changes in filterability only reflect changes in the suspension.

Filterability Index

A suspension is considered to...


Porous Medium Filter Medium Head Loss Displacement Time Approach Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Brennan, J.G., Butters, J.R., Cowell, N.D. and Lilley, A.E.V. (1990)Food Engineering Operations. Elservier Applied Scientific, London.Google Scholar
  2. Earle, R.L. (1983)Unit Operations in Food. Pergamon Press, Oxford.Google Scholar
  3. Matterson, M.J. and Orr, C. (1987)Filtration principles and Practices. Marcel Dekker, New York.Google Scholar
  4. Cleasby, J.L. Approaches to filterability index for granular filters,American Water Works Association, 372–381, Aug. 1969.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Cecilia Hodúr
    • 1
  1. 1.Department of Unit Operation and Environmental TechniqueFaculty of Food Engineering, University of Szeged

Personalised recommendations