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S.,--p-29-99 04:44i--1 P .05 • 0 AdMIN STAND/,M)OPERATING CONDITIONS Purollits A-520E NrrWiEREMOVAL Operation Flats Solution Minutes Amount Service 8-32 BV/h Influent water — — 1--4 1-4 gpnVP to be treated Backwash 5-7.5 nvb Influent water 5-20 1.5-4 BV 2-3 gpm/fI2 10-25 gaW (110-2M) (50-WF) Regeneration 2-6 BV/h 31,e-1 0%NaCl 20-60 90-2508 NaCl .25-.8 gpnw 7.8-15.6 lb/P Rinse slow 2-6 BV/h Influent water 20-60 2-5 BV .25-.6 gpnuV 115-40 galV Rinse fast 8-32 BV/1t Influent water 1-4 gpm/tt3 Backwash expansion 50-75% Design rising space 100% REGENERATION Sodium chloride Is generally preferred for regnera- clum carbonate In and around the Purolite A-520E tion for reasons of cost and efficiency.When available (or any other resin used in this application).Although sea water can be used quite effectively. The use of the precipitation Is not particularly detrimental in the softened water for make up of regenerant and rinse short term, the long term effects may include is often recommended to avoid the precipitation of cal- increased resin attrition and leakage of nitrates. PRECONDITIONING PROCEDURE Purollte A-520E Is processed to insure that It meets On Installation It is recommended that the resin be the requirements for use In the treatment of potable regenerated with two bed volumes of 6% NaC; water. followed by a rinse of four bed volumes of potable water, prior to use. HYDRAULIC CHARACTERISTICS The pressure drop or headloss across a properly by the bed,abnormal compressability of the resin,or classified bed of ion exchange resin depends on the ti,'9 Incomplete classification of the bed will have an particle size distribution,bed depth,and voids volume adverse effect and result In an increased headloss. • of the exchange material as well as on the viscosity Depending on the quality of the influent water, the (and hande on the temperature)of the Influent solu- tion, Factors affecting any of these pammetterv., for application and the design of the plant, serAce flow .9911ki. a example the presence of particulate mutter iil:-,.rc-d oL-',, rases may vary frCM 10-40 Led bolumes/hour (1-5 ai pree�u;a drop data I rpriV13).Typic, is given in Fig. 1.