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SWDD is under contract with the state for this service and federal <br />police are present to guard the contraband until they are sure it <br />is burned. <br />WATER AND WASTEWATER SERVICES <br />Director Pinto briefly described the County's water treatment <br />plants and plans for future development: <br />The treatment level required by the water plants is dictated by the Safe Drinking Water Act. The <br />water treatment in Indian River County is state of the art Reverse Osmosis. The county currently <br />operates two Reverse Omosis (R.O.) Plants ( S. County R.O. and N. Beach R.O.). Currently, the <br />N. Co. plant is under construction and the N. Beach plant is being prepared for demolition. (See <br />N.CO R.O. Plant construction and repump and storage facility). Exhibits are attached depicting <br />the R.O. process for your information. Over the past 10 years, since the construction of the <br />county's first R.O. facility, the South County R.O. plant process technology has dramatically <br />evolved. Through a staff conducted membrane piloting plan, we were able to determine the best <br />membrane on the market to meet our needs. (i.e. membranes operated at 300-500 psi). Through <br />this effort and in conjunction with our engineers, the operating pressure has been greatly reduced <br />to approximately 150 psi reducing overall water production costs. (See South Co. R.O. Exhibit <br />and report titled Low Cost Membrane Softening by William Suratt, Terrance Pinto, Brad <br />O'Keefe). The first low cost membrane system was installed in the S. CO. R.O. plant with full <br />computer controls. The greatest draw back to the R.O. process is the disposal of the reject or <br />brine stream. Staff in conjunction with our consultant, piloted a custom treatment system for this <br />side stream treating the discharge into the Indian River. This treatment process is new and <br />working very successfully to meet state and federal permitting requirements. <br />FUTURE DEVELOPMENT <br />The County owns and operates five RO plants and is interested in further <br />reducing construction and operating coats by applying this knowledge to treat the <br />concentrate from existing and future plants. The County is also planning to <br />apply these designs to H2S removal from the permeate in lieu of conventional <br />packed tower degasifiers and odor control units. The following additional tests <br />have been proposed for the near future: <br />1. Conduct experiments to determine the amount of the sulfatelelemental <br />sulfur split and the changes in concentrate turbidity after treatment, if any. <br />2. Explore the use of thiosulfate and ferric chloride addition for obtaining <br />higher percentages of sulfate and less elemental sulfur. This is important in <br />minimizing the formation of turbidity in the finished water storage tanks. <br />3. Obtain additional information with operating at different pressures and <br />flows. <br />13 <br />FEBRUARY 3, 1997 eooK ;Act 439 <br />