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up - 29—9!..o 04 ;44P P 06 <br /> 0 <br /> Fig. I PRESSURE DROP CHARACTERISTICS Fig.2 BACKWASH EXPANSION <br /> AM SERVICE FLOW RATE,U.S.gpffvsq.ft. BACKWASH FLOW RATE, U.S.gpm/sci.ft. <br /> 1.10 <br /> 4 8 12 16 100 0.8 1.6 2.4 3.2 4.0 <br /> 4. <br /> 00 F <br /> IM <br /> Uj <br /> 0.8 0 80 <br /> WC3 OOF <br /> 90 3. LU <br /> 0 0:C M <br /> 0.6 %50 F,4 ® z <br /> 60 <br /> X1.F <br /> 2- <br /> 0.4 Lu 40 <br /> — <br /> cc <br /> LUW <br /> cc 0.2 c 1 cc <br /> (n M 20 <br /> (n (n <br /> En W <br /> LUQ <br /> a. 0 <br /> 0 10 20 30 40, 0 2 4 6 a 10 <br /> SERVICE FLOW RATE, M/h BACKWASH FLOW RATE, M/h <br /> During upflow backwash, the resin bed should be particles, ensuring minimum resistance to flow. Bed <br /> expanded In volume by between 50 and 70%. This expansion increases with flow rate and decreases <br /> operation will free it from any particulate matter, clear with temperature, as shown in Fig.2. Care should be <br /> the bed of bubbles and voids,and reclassify the resin taken to avoid over expansion of the bed. <br /> CONVERSION OF UNITS <br /> 1 m/h(cubic metres per square metro per hour) <br /> = 0.341 Imp.gpM/ft2 <br /> = 0.409 U.S.gpnvw <br /> I kgtcm2/m (kilograms per square cm. per metro of bed) <br /> = 4.33 psVft <br /> = 1.03 atm/m <br /> = 10 ft H,20/ft <br /> OPERATING PERFORMANCE <br /> The high selectivity of Purollto A-520E for nitrate by a high influent concentration of sulphate. For this <br /> over sulphate ensures that any necessary reduction reason, although Purollte A-520E has a lower total <br /> In nitrate levels can be achieved even In the presence exchange capacity than standard strong base anion <br /> of high influent sulphate concentration. Hence it so resin, its use can produce advantageously higher <br /> offers the advantage over standard strong base resins throughputs for the following reasons. <br /> that its exchange capacity for nitrates is less affected <br />