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1 ' <br /> ATTACHMENT 1 <br /> Scale Inhibitor System Review <br /> South RO Plant <br /> Project Description and Understanding <br /> The following provides an approach to consider eliminating scale inhibitor addition to the <br /> raw water at the South RO plant . The use of scale inhibitor at membrane treatment facilities <br /> is sometimes unwarranted where raw water quality does no exhibit sparingly soluble salts <br /> which tend to scale at high membrane system recoveries . Since acid is used both to prevent <br /> scaling of the membranes and enhance removal of hydrogen sulfide at the post-treatment <br /> system through lowering of the pH , it should be determined if acid provides adequate scale <br /> inhibition without the use of scale inhibitor. <br /> SCOPE <br /> Task 1 — investigate Elimination of Scale Inhibitor <br /> Define water quality from wells : <br /> Specific water quality parameters which cause scaling will be identified and a list prepared <br /> for a lab to test each well . Laboratory and coordination costs to be provided by Indian River <br /> County. <br /> Review raw water data <br /> These results will be tabulated and used to prepare membrane projections for worst case <br /> scaling potential . Blending of certain wells may also result in worst case water quality and <br /> will be evaluated . A matrix of water quality parameters will be prepared and reviewed . <br /> Run and review projections with membrane manufacturer <br /> We will run numerous projections and identify the worst case scaling potential without scale <br /> inhibitor. We will review these projection with Hydranautics and acquire consensus that <br /> specific operating conditions can be implemented without any long term scaling potential . <br /> Provide recommendations <br /> Based on the results and evaluation of projections , we will provide a recommendation which <br /> may justify elimination of scale inhibitor. <br /> Task 1 Alternate — Coordinate Bulk Tank Scale Inhibitor installation — (if neeessar <br /> If the use of scale inhibitor continues, the installation of 2 — 3000 gallon black HDPE tanks <br /> is required . We believe that the best option for installation of the two tanks is through the <br /> existing North outside wall . The existing tie-beam carries the roof loads , of which the <br /> existing windows and CMU block below it adjacent to the columns can be removed safely to <br /> allow for installation of the two new tanks . Installing the tanks from the south double doors <br /> does not appear to be a better alternative since this wall may be load bearing, carrying the <br /> capacity of the upper floor hollow core roof slabs . <br /> F. \Utilities\UTILITY - EMPLOYEE FOLDERS\Teny Southard\Agenda Item - Kimely Hom Scale Work Order 9 May 2005 doc <br />