Cooling Tower Water Treatment


Frequently Asked Questions

Q. Is it true that the make-up water stream for WCTI technology has to be almost entirely softened (Ca and Mg removed)?

Q. If we have high hardness, high silica and high alkalinity water, will we need a mixed bed demineralizer along with a softener?

Q. Can we use a standard water softener that is commercially available?

Q. Since blow down with the WCTI process will stop or decrease to very small amount but a very concentrated stream, how does the WCTI technology address the buildup of TDS and the ways to remove the buildup from the tower water?

Q.Solids precipitate continuously in the tower water as described by the WCTI technology.  How is TSS removed?

Q. Since Monovalent ions (Cl and Na and other) continuously build up in the tower water, how are they removed?

Q. The TDS could be built up to and above 44,000 mg/L. How will the monitoring instruments continue to function at this level of TDS is unclear?  Wouldn’t the maintenance on different probes (TDS/Conductivity, pH and other) be high?

Q. At very high operating TDS, the drift mist will be depositing a lot of salts outside the tower and may create an issue with soil and groundwater contamination. High salt drift from cooling towers became an issue in the past in several instances where public was exposed to it. It appears that WCTI relies on losing the concentrated TDS through the cooling tower drift. Most towers have an air permit requirements and drift TDS is limited by such a permit. For this case high TDS in the drift; will it cause all the nearby equipment, buildings and other installations to experience severe exposure to TDS and potential damage?

Q. Since the technical aspects of the WCTI technology are sound as far as water savings. However, there are also increased waste streams from regeneration of softening resins. If regeneration requires use of NaCl only, then aren’t there increased chlorides of sodium in the tower?

Q. The claim of the WCTI technology that the blow downs can be discharged to the sewer would have to be checked with the local sewer authorities?

Q. The heat balance for the cooling tower can be affected by the significant blow down reduction or elimination. One key point is that the boiling point elevation due to high TDS means that the lower temperature on the Cooling Tower will be higher?

Q. Is it fair to claim ZLD (zero liquid discharge) as the softener regeneration waste is a substantial liquid waste and that too at high TDS and Chlorides?

Q. If one calculates the LSI (Langelier Solubility Index) of the circulating water, it will become evident that water will be on highly scaling side for even low levels of influent hardness?

Q. Should we conduct Piloting of the WCTI before we try this process?

Q. This technology is very new and it would be risky to implement it w/o having more information on its performance in the industry?

Q. What size softeners do we need for this process?

Q. How much does it costs to run the program?

Q. What if our water has very little alkalinity or silica available?

Q. How is the program implemented?

Q. Is there any other equipment needed along with the softener?

Q. How do you control bacteria with WCTI technology?