The Town of Lantana chose to work with Tonka Water to design an economical and efficient ion exchange treatment system, which meets all current and anticipated regulations, while accommodating future expansion. The Tonka Water solution was found to be the most cost-effective alternative when compared to membrane treatment or any other organic and color removal process.
The treatment process consists of three 12’ diameter strong-base anion exchange vessels for TOC reduction and color removal, plus two 12’ diameter cation exchange vessels for softening. All the flow passes through the anion exchange vessels, while just a portion of the flow passes through the cation exchange vessels. Each anion exchange vessel treats 8 million gallons between regenerations, a process which requires approximately 40,000 gallons. The net result is an overall throughput efficiency of 99.5%.
The supplied RidION™ system includes the brine maker and delivery system process, valves, instrumentation, NSF-approved ion exchange resins, and PLC controls.
Tonka Water brought unparalleled experience in anion exchange systems for TOC and color removal in south Florida waters. We have several full scale anion exchange plants in south Florida as well as other ongoing pilot studies using the anion and cation exchange processes. Our experience in this technology allowed the City of Lantana to specify Tonka Water for overall process and system responsibility, with guaranteed results.
Groundwater under the hydrologic influence of the Florida Everglades quite often contains high levels of hardness, total organic carbon (TOC), and color. Historically, municipalities in south Florida have used lime softening followed by chlorination to produce a color-free, soft water for their consumers. Unfortunately, this method is no longer viable since aggressive chlorination of color-causing organic compounds results in the formation of disinfection by-products (DBP’s) such as trihalomethanes and haloacetic acids.
To comply with more stringent DBP regulations, many communities in South Florida have investigated installing membranes as a treatment alternative for their hardness/TOC/color issues. However, with reject rates as high as 20%, membranes are difficult to justify against the withdrawal limitations imposed by the South Florida Water Management District. Furthermore, the high capital and operating costs of membranes makes replacing an existing treatment plant with a new membrane plant difficult to justify.
The Tonka Water treatment process has been effective in delivering high quality water, as indicated below.
|Color||50 Pt-Co||2 Pt-Co||96%|
|THM Formation Potential (μg/L)||453||33||93%|
|HAA5 Formation Potential (μg/L)||80||21||74%|