DM Plant - New Resin Changed- Coductivity Not Normal

What is different about the new resin, Murphy?

It may be a quality issue with the stock of resin used.

We are checking this issue.

Thank you.

Can your feed water be contaminated with organics?

No, The feed is from High puirty Desalinated water.

Without sounding combative, at times one can not assume without testing.

First things first, let's backup and look at things from a different perspective, okay?

Did your plant run any sort of "pilot plant" study using the new resin as well as conduct extensive water quality testing?

If yes, what were the results? I sure hope you can share this with us....

Second, is the new resin in your beds identical in every way to the resin used in the pilot plant study, if conducted. Did the manufacturer of the resin change the formulation in any way?

Third, has your raw water quality changed significantly in the time since the resin change?

Forth, what is the raw water source?

That's just for starters.....

Sir, It is not a pilot plant. This is a power plant. We have two mixed beds. In one of the mixed beds, the total DM water output between the regeneration has reduced considerably. So, we replaced the resin with fresh resin of same specs. The raw water quality has not changed.

Why did you do this?

Somewhere, within your organization, someone must be responsible for process engineering, purchasing, management and water quality, not to mention bed inspection.

So, whoever decided to do this, along with whoever made the money on the resin sales, including kick-backs, should be responsible for the performance of the system.

Look here: Search GlobalSpec for a process engineering consultant.

If it ain't broke, don't fix it.

Hire a professional to help you.

If everything is assumed to be ok. First check should be the resin and also check if inlet conductivity has gone up.

Sir, We will check the resin. The inlet water quality has not changed. The other bed is running normal, with same input.

Did you at least try a double regneration on the mixed bed in question? Also, are you using non-reactive resin as a separation band when you float the resins to regenerate? If not, then perhaps with the new resin (and with the new nozzles in the distributors), you are not acheiving good separation. Poor separation will lead to cation resin in the sodium form, and anion type II resin in the sulfate form (if sulfuric acid is used, otherwise it will be chloride). Make certain that after mechanical items are changed, and resin changed that bed depths are correct, and that the specified flow velocities are maintained in all operational and regeneration steps. If no obvious problem is evident after these considerations, try an extra regen or two, and see if that helps.

Thanks for your sugeestion. Already we did the second regeneration and the Mixed bed become normal. It is in service now.

Sir, My thanks to all for giving their valuable suggestion for my mixed bed problem. Finally we did second regeneration and the problem is solved. The mixed bed is running normal with less outlet conductivity. One of our member suggested the solution. we are thankful to him.

I hope this forum considered closed

You are most welcome. I have noticed that new resin generally takes excess reagent to completely convert from the salt form.