Chloramine removal

[huppmanm]

With chloramine treatment of municipal water systems becoming more prevalent, what additional pretreatment is required for water purification systems utilizing reverse osmosis. Are ammonia and ammonium residuals generated by conventional chlorine removal approaches (activated carbon, bisulfite injection or UV)? If so, what options are available to remove the ammonia/ammonium that would pass thtough the RO membranes ?

 

[oxilume]

Huppmanm,

The holy grail for water and/or wastewater treatment would be a process or apparatus for removing ammonia from water down to parts per billion (ppb).

The EPA, US Navy and in particular the medical industry has been looking for a technology for removing ammonia from water for injection(WFI). WFI is used for making up IVs, and/or mixing with blood plasma.

With that being said, a company in Houston had developed a novel "Mass Transfer Unit," for stipping ammonia from water. The Radially Entrained Vapor EXtraction system can be found on the following the website:

http://www.revextechnologies.com

Contact Rod Grisham of Revex Technologies to discuss your application.

Please keep in mind that you may have an off-gas, ladened with Ammonia that must be captured, incinerated or gasified.

Sincerely,
Todd Foret
toddforet@usa.net

 

[GarySCWSVI]

Activated Carbon (Coconut Shell) would be my recommendation. Two stage system. Primary followed by a polisher. We have had good success with that. The gaseous ammonia would not be rejected by the RO membrane. However, the ammonium form would be rejected by the RO membrane. Both forms should be adsorbed by the AC.