Laserfiche WebLink
_;,ep-29-99 04:46P <br /> 0 <br /> 1� <br /> Both standard gel type or macroporous strong base by sulphate loading.Apart from the obvious disadvan- <br /> resins are quite capable of effective nitrate removal tage of the reduction of treated water obtained on <br /> where sulphate to total anion ratios are low. However, cycling,the exchange of both nitrate and sulphate by <br /> on account of the high selectivity for sulphate in dilute chloride will result in a less palatable and sometimes <br /> solutions which follows the order, less acceptable water than the influent supply, in that <br /> HCO3' <Cl- < NO3- < SO; the treated water may be more corrosive and the lim- <br /> selective displacement of nitrate by sulphate results in its for chloride concentration may be exceeded. <br /> the effective nitrate removal capacity being reduced <br /> PUROLITE A-520E,CO-CURRENT REGENERATION <br /> Fig.3 OPERATING CAPACITY Fig. 4 NITRATE LEAKAGE <br /> N0, vs. NO' .RATIO <br /> VS. NO;+3O.RATIO NO;a SO, <br /> 1.0 50 <br /> 20 n <br /> z <br /> ®, W <br /> z0.13 O 40 <br /> p 15 z <br /> U. <br /> 0.6 a e 30 5 g NaCL4 a 1W) <br /> G 250 q NaW(15 bbl "�° CL <br /> 10- <br /> 0.4 <br /> ® U C7 <br /> ® ` 20 <br /> U Q.4 -- — <br /> 1 5 g NacN ld'ft') Q <br /> 5 � 2500N W115 ') <br /> 0.2 w ¢� 10 <br /> O z <br /> 0 00 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 1.0 <br /> _NO RATIO <br /> RATIO RATIONO;+SO' <br /> NOS+SO; <br /> Fig.3 and Fig.4 give the operating capacity and nitrate hence may not be used directly to determine the <br /> leakage respectively which may be obtained using co- throughput of water. Ali ion concentration values are <br /> current regeneration at the given regeneration levels. either on a ppm or a meq/1 basis for ratio <br /> Values obtained from Fig. 3 are expressed in terms determination. <br /> of nitrate throughput,corrected for nitrate leakage,and <br /> The throughput of treated water may be calculated as <br /> follows; <br /> cyclic output(Iltres) = L x OC x. 103 where V = resin volume(litres) <br /> OC = operating capacity(eqA) <br /> " L = nitrate load(megA) <br /> In = nitrate leakage(meq/l) <br /> or cyclic output(U.S.gal) = Va x OCk x 103 where V, = resin volume(ft3) <br /> 0.058 (LP - Ind OCk = operating capacity(Kgr/ft3) <br /> LQ = nitrate load(ppm as GaCO3)) <br /> l"p = nitrate leakage(ppm as CaCO3) <br />