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Current IssueOctober 31, 2014
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Ask The Expert: Silica & RO fouling
02/02/2003 
 
Question: Q: We are an RO countertop water purification system manufacturer. The are four stages in our system: sediment, pre-GAC, RO membrane and post-GAC filters. The problem is that we sometimes found silicates (CaSiO4 or SiO2) at the pure water tank. Would you like to advise me?
P.W. Lee, CWS-I
Malaysia
 

Answer: A: We would first suggest you refer to an article by Peter Meyers, a former member of the WC&P Technical Review Committee who is with ResinTech of West Berlin, N.J.,:

"Behavior of Silica in Ion Exchange and Other Systems," by Peter Meyers, which was presented at the International Water Conference, held in Pittsburgh, PA October 18-20, 1999—see www.resintech.com/index.cfm?Point=TechArticles#3

Robert Slovak, a technical advisor to another magazine we publish, Agua Latinoamérica, is an expert on reverse osmosis systems and is also familiar with the problem of silica in membrane separation applications. He can be reached at robtslovak@aol.com.

The following websites also had information regarding silica and RO fouling:
• http://www.medrc.org/technical/es/97-AS-004d.html
• http://www.engr.ucr.edu/~hoek/Presos/Hoek(NAMS)CEOP.ppt
• http://www.desline.com/articoli/3802.pdf • http://www.eng.unsw.edu.au/alumni/unsweng/issue6/chem.htm

Hope that helps.

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