Re: Dealkalizer

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Posted by Boiler Bob on May 16, 2001 at 06:41:56:

In Reply to: Re: Dealkalizer posted by Vern on May 15, 2001 at 18:59:55:

: : : : : : Need some help with a new dealkalizer unit. What kind of p-m/alkalinity numbers should i be getting?

: : : : : I have never operated a dealkalizer, but I would assume you are looking
: : : : : to get zero alkalinity out of the unit, and then blend that water with
: : : : : raw water to get your desired alkalinity numbers. Those desired alkalinity
: : : : : numbers will be chosen based on the process you are using the water for, in this
: : : : : case apparently a boiler. Vern
: : : : Yes, but the problem i have is really high chlorides and i'll get readings of say 8/p-alk and 8/m-alk and then the chlorides of 2000 or
: : : : higher. Shouldn't i be getting p-m/alk that are different like 20p and 45m with maybe lower chlorides? thanks.

: : : Bob, is this an ion exchange unit regenerated by salt? With a 2000 chloride level after regeneration,
: : : sounds to me like you aren't getting a good flush at the end of the cycle. I'm not certain what p and m alk readings
: : : you should be getting, but with ion exchange you should get close to zero until the resin bed becomes exhausted. I know
: : : a guy here in Fresno who works on these, I'll see if I can contact him and get some better info. Vern
: : Thank you, Thank you, Thank you. Bob

: Bob, the guy I talked to said you should get a 70 to 80% reduction in alkalinity
: from the incoming water to your effluent. So if you have a 100 m alkalinity, your
: effluent should be 20 to 30 m alkalinity. As for the chlorides, he didn't have a
: real good answer. He said possibly you weren't getting a good flush at the end of the
: cycle, but that wasn't necessarily so. The dealkalizer operates by exchanging chloride ions
: for another ion in the water, so you apparently are adding chlorides to the effluent
: water. I'll do some more research on this, it all doesn't make sense
: yet. Vern

I half expected the answer about the rinse cycle.I
have checked that and found that the brine draw line that connects to the 5-cycle valve has a crack in it that allows air to be sucked in instead of rinse water. Thanks again Bob

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