Rotary vacuum-drum filter

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Oliver-type rotary vacuum-drum filter.

Rotary vacuum filter drum consists of a drum rotating in a tub of liquid to be filtered.

The technique is well suited to high solids liquids that would blind or block other forms of filter. The drum is pre-coated with a filter aid, typically of diatomaceous earth (DE) or Perlite. After pre-coat has been applied, the liquid to be filtered is sent to the tub below the drum. The drum rotates through the liquid and the vacuum sucks liquid and solids onto the drum pre-coat surface, the liquid portion is "sucked" by the vacuum through the filter media to the internal portion of the drum, and the filtrate pumped away. The solids adhere to the outside of the drum, which then passes a knife, cutting off the solids and a small portion of the filter media to reveal a fresh media surface that will enter the liquid as the drum rotates. The knife advances automatically as the surface is removed.

See also

• Vacuum ceramic filter
• Dewatering

Further reading

• Smith, Paul G.; John S. Scott (2005). "Vacuum filter". Dictionary of water and waste management. Boston: Elsevier. pp. 452–453. ISBN 0-7506-6525-4. OCLC 58456687. 
• Spellman, Frank R. (1997). "Vacuum Filtration". Dewatering Biosolids. Boca Raton, Florida: CRC Press. pp. 85–101. ISBN 1-56676-483-1. OCLC 36556585. 
• John J. McKetta, John J. McKetta Jr, "Unit Operations Handbook: Mechanical separations and materials handling", CRC Press, 1992, pp.274-288. ISBN 082478670X
• Hiroaki Masuda, Kō Higashitani, Hideto Yoshida, "Powder Technology: Handling and Operations, Process Instrumentation, and Working Hazards", CRC Press, 2006, pp.194-195. ISBN 1420044125

External links

• Rotary drum filter, United States Patent 308143
• Rotary drum filter, United States Patent 5006136
• Luthi rotary drum filter
• Filter, patent number 2362300

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