(800) 726-4187
April 1, 2013
Perils of purchasing dry…

I ran across the quick lime silo and slaker (pictured above) on a trip visiting several large Texas water plants.  The particular image is what too many water plant operators face every day.  Purchasing dry chemicals especially dry hydrate lime or quick lime can introduce additional headaches at municipal treatment plants.  Buying dry can often result in constant issues causing “Out of Service” on municipal silos.

Yes, every purchasing agent loves the thought of saving chemical cost, but at what expense?   Even the best silos are not immune to reoccurring maintenance issues.  One reason is because even the best silo and slaker/slurry systems are at the mercy of the quality of the raw supply of dry lime.  Even though the specs call for a certain minimum quality standards the amount and size of inert particles in dry hydrate and quicklime can vary a great deal in each bulk load.  Also, very few operators have the proper lime feed equipment necessary to check the quality of the dry lime to know if it meets the required specifications.  One municipality I visited is in the process of building a brand new plant and is installing a system with a day tank that will recirculate the lime slurry 600 feet from storage to the feed point and back.  I feel sorry for the operators.  Having 15 feet to maintain is bad enough, but 600 feet will be miserable.  The chief operator said he already knows the system will not work even before it is built.

For those reasons and many more a large number of municipalities have switched from feeding dry lime to feeding a high quality lime slurry.  There are several benefits associated with using slurry.  For example, our CAL~FLO slurry particle size is small and very uniform.  We remove the inert particles and debris that the large mines don’t take out.  Second, municipalities who move to slurry can install a CAL~FLO feed system and eliminate the “Out of Service” typically experienced with a silo.   We are the only company who offers our clients a functional guarantee which states that they will not experience clogged feed lines and sediment in the storage tank.  Considering all the handling benefits, efficiencies, and control associated with handling a liquid, municipal plants are evolving.  Instead of dry lime they are feeding high quality lime slurry just like all the other chemicals (alum, acids, PAC’s, etc) that are delivered and dosed as a liquid.

 

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We would enjoy questions and feed back on this and other blog topics.   Please submit comments through our website or LinkedIn company page.

Author: Dallas Burnett

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Burnett, Inc.     7095 Highway 11      Campobello, SC 29322      1-800-726-4187      (864) 592-1658 tel      (864) 592-1690 fax