Question of the Day: RO vs DI

Question

What factors should go into determining whether reverse osmosis or deionized (i.e. ion exchange) water is used for boiler makeup?

Bill Green · Answer

The boiler manufacturer will specify the water quality required. There are many different boilers and boiler applications.  RO usually is the last step after softening, filtering and polishing out any solids.  Ion Exchange water is necessary on almost all boilers.  RO is expensive and only justified if the manufacturer and application call for such high quality water.  Of equal importance is chemical pretreatment of the boiler water and consideration of the conductivity limits of the boiler.  Microfiltration and UUltra filtration are membrane technologies similar to RO but give results that might be sufficient for many high end boiler applications.  RO water and DI water is very corrosive and must be considered in the overall water management of boiler feedwater. Billg@prochemtech.com

MOHAMMED NAZEER · Answer

Hello,For RO and DI water TDS is different.Dionised required Ion exchange or Electro deionisation.DI water has 3 types Type-1,2,3 for reasearch and industrial process application it is needed.
To determine factors
Water quality inspection lab test.DI water TDS very low than RO.
And Dionised water cannot keep open tank it required setup precise storage to eliminate bacteria will contaminate.
We deal with Milliopore ultrapure systems in last project

MUHAMMAD ILYAS KHAN · Answer

We at  Sui Gas Field "Gas Purification Plant" using RO water as Boiler feed with no problem. Our Steam generation is at 400 Psiig Superheated steam. Operating a Demin Plant have lots of hassle than operating an RO Plant.

Seth Rockmacher · Answer

It all depends on effluent requirements and influent water quality   You can email me at srock@resintech.com glad to help. Just supply requirements and water analysis

Ivan Tikhonov · Answer

Good day!
I think that these water treatment systems are not quite correct to compare as competitive, rather as increasing the efficiency of each other when used together. When only RO or deionization is used to produce make-up water for steam boilers, both systems have a number of significant drawbacks.
If anyone is interested I publish my thoughts about the water chemical mode of low pressure steam boilers on my website- https://tiwater.info/en/
The comparison of softening and RO systems for boilers that is taking into account the influence of carbon dioxide and carbonates in feed and boiler water–The assessment of the effect of carbon dioxide on the water-chemical modes of steam boilers 
Examples from my practice of using RO for steam boilers- The features of the development and maintenance of water-chemical mode of low-pressure steam boilers using membrane technologies
The use of the advantages of osmosis systems for complex water treatment for boilers, including degassing- Water degassing using reverse osmosis membranes

Question of the Day: RO vs DI

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