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Input Materials; <br />Ion exckiange resins and Water Resins with non- <br />deionized water is contact — Deionization RCRA metals Off-site <br />with coppeerpiping/tubing Process (CWC I81) disposal <br />FIGUREI.4.4. DEIONIzED COOLING WATER AND ION EXCHANGE RESIN WASTE PROCESS <br />FLAW DIAGRAM ' <br />Hazardous Waste and Process Descri tion <br />Ion exchange resins are installed in-line as part of SLAC's closed-loop, low -conductivity <br />cooling water (LCW) system. LCW is used to cool sections of the two-mile linear <br />accelerator and other research equipment. The LCW is initially produced from potable water <br />using a fiont-end deionization system and the ion exchange resins of this system are recycled <br />with an outside water services vendor. This closed-loop cooling system is constructed of <br />copper tubing and heat exchangers, releasing copper ions that are in turn removed by the in- <br />line ion exchange resins. In-line ion exchange resins are strategically used to polish or <br />remove copper ions from the LCW as it goes through the closed-loop cooling system. The <br />use of LCW and copper heat exchange equipment is essential to controlling the operation of <br />the accelerator and associated equipment. <br />The generation of spent ion exchange resins as a hazardous waste vat ies'depending on how <br />ice i <br />long the resins were in service an experimental area and the heat load placed on the <br />closed-loop cooling water system. Spent resins are generated from the operation of the linear <br />accelerator and other experimental equipment and may come from. different parts of the <br />experimental facilities based on their availability for access and maintenance. Some ion <br />exchange resins in other areas of the experimental facilities may have a shorter replacement <br />cycle and so turn out to be non -hazardous. As a result, the generation of spent resins is quite <br />variable. <br />SLAC has also helped reduce the generation of this waste stream since the last 2006 by moxe <br />fully implementing a resin recycling program !n which old resins. are managed and new <br />resins are returned to SLAC by an outside vendor. <br />SOURCE iZEDUCTION/POLLUTION PREVENTION EVALUATION <br />Description of Measure: <br />No recommended reduction measures except to maintain equipment to maximize <br />Pf%tnian n�. <br />4.5 Acid and Alkaline Debris <br />September 1, 2015 SBl4 Plan III -11 <br />