Browse Prior Art Database

Reduction of Fluoride Waste and Reclamation of Water

IP.com Disclosure Number: IPCOM000087341D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Trudell, JH: AUTHOR

Abstract

Described is a process for the concentration of fluoride waste as well as water reclamation by the use of the reverse osmosis process.

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Reduction of Fluoride Waste and Reclamation of Water

Described is a process for the concentration of fluoride waste as well as water reclamation by the use of the reverse osmosis process.

A surge tank 1 is supplied a mixture of fluoride and slurry waste (approximately 90% water, 10% sludge in solution) which is directed under pressure at 50 to 90 psig to ultrafiltration process units 2, which separate under pressure (100 to 200 psig) ultrafine particles, colloids, emulsions, and micromolecules down to as small as 500 Angstroms by pressure permeation through a loose low pressure filtration layer or membrane.

At this point the process gives a yield of 80% water and 20% sludge. The water portion is collected in a first stage product tank 3 in first pass permeate (product water) for use in fume scrubbers or for continuation on to second and third stage reverse osmosis units 4 where a high quality pressure (400 psig) membrane separates micromolecules from 500 Angstroms down to as small as 20 Angstroms. The process at the second and third stage units 4 yields 80% water and 20% sludge. The permeate (product water) is collected in a final permeate tank 5 which may be used as cooling tower make-up water, rough rinses, or demineralization, or as make-up water for a fluoride treatment plant. The waste water is diverted at the ultrafiltration phase units for processing in a vacuum filter or diversion to second and third stage concentrate tanks 6 for ultimate TDS (total disso...