Open Discussion: ION EXCHANGE PROCESS OR REVERSE OSMOSIS

Media

Taxonomy

• Water
• Ion Exchange
• RO Systems
• Reverse Osmosis
• Reverse Osmosis
• Ion Exchange Resin

3 Comments

1. In general I agree with process, but for less 1 micro Siemens and less 20 ppm Demi water  can be sone by strong Cation exchange followed by Strong Basic AnionExchange and a polishing strong acidic Cation exchanger. In case of having a lot of weak cations and anions in your raw water you can check  WAC/SAC followed by WBA/SBA and then SAC polisher. For Malaysia River water I found out the running cost  are lower for SAC-SBA-SAC polisher then RO system followed by mixed bed.

   To avoid the technical handlings problems in mixed bed you can choose after RO 1 pass system SAC-SBA-SAC polisher for > 10MegOhm*cm and < 20 ppb SiO2 DI-water. That's good enough for High pressure boilers.

   So final a combo system could be the solution.

   MOST IMPORTANT: Have a complete raw water analysis that follow RO membrane manufacturers or Ion Exchange manufacturers, BTW Don't hesitate to use the help rom IEX/RO manufacturers for process basics.

2. Dear Maher Louis,

   I understand that Dr Gandola compares technologies to produce demi water (not potable water) and I fully agree with him.

   In the case of raw water of very high salinity (like sea water) thermal desalination can be considered and eventually convenient in some applications.

3. Dear Mr. Gandola, Please double check again your claim; neither ion exchange, nor reverse osmosis are appropriate processes to generate potable water. Try to see by yourself how you are getting potable water in your country, your city, and your community. You are getting pure potable water by Room Temperature Evaporation: Simply at room temperature seawater evaporates pure water vapor, which is next collected in clouds, then clouds are moved towards land by wind, and eventually it rains forming rivers water, which is potable water. Then it would better for you and everyone else to imitate nature and do the same, if interested you can visit naturalseawaterdesalination.com

   2 Comment replies

   1. I remind all my colleagues that the open discussion refers solely to the production of demineralized water. Potable water production is a completely different topic.

   2. Potable water made from surface water is becoming more polluted.  It contains what ever the rainwater comes in contact with that is soluble.  Normal potable water treatment produces clean water from surface water however this water still contains a lot of contaminants.  RO technology will remove a significant amount if not all of these organic compounds ensuring pesticides, hormones & other chemicals like aluminum silicates are removed.  The link between health & diseases has been linked to water however if the problem is accumulative over a longer period it is not linked to water & possibly it should.  I would rather drink water that contains no organics or colloids &  I guess when people find out how much rubbish is still in the water after treatment there will be a demand for all surface water potable water system to employ RO.