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OUTLET 790-4 Hose Barb 790-5 Aluminum Nut Ion exchange resins are classified as`cati'on or anion 790-6 Tee`apRing exchan era. Both t s are roduced from the same basic 3J4-I.D.HOSE 7907 Fill Cap`O'Ring 4 types P 4 790-8 Bushing`O`Ring organic polymers. The chemical behavior of the resin is 790.10 907 Distributor determined by the particular ionizable group attached to the 79011 13/16'x.4"ABS resin. The following is a list of five resin -types that may be 9 790-12 906 Distributor used by the Facility for metals along with the important 780.13 Shipping Cap characteristics of each. 1 6 9 6 .. 4 3/4"I.D.HOSE 13 1. Stron Acid Cation - The important characteristics .of this 2 res n type are.: The exchange. capacity is .not affected by the pH of the solution, it is the least expensive resin, INLET SHIPPING'. it is the most durable and its selectivity is low so it CAPS may pick up hardness in the water. d 17 13 2. Weak Acid Cation - Important characteristics are: The �t 6 exchange capacity is reduced at a solution pH below 6, it 2+h`-8 THREAD will tend not to pick up water hardness because the 8 selectivity for heavy metal is higher and it is a more expensive resin than the strong acid but a smaller amount n of reagents are needed to reverse the reaction and regenerate the resin. ;L 10 3y 1-U.FT. 3. Strong Base Anion - Important characteristics are: The ? CMB-11 exchange capacity is unaffected 'by solution pH, it is generally more expensive than the cation resins, it has a shorter functional life span than cation resins and the resin can be fouled by organics in the solution. 11 + 4. Weak Base Anion - Important characteristics are: The 54" exchange capacity is reduced above a solution pH of 7, i;� 13"NOMINAL I.D. the resin cost is the same as the strong base anion, and less reagent is necessary for resin regeneration than for the strong base anion resin. FIBRE-GLASS IaI TANK 5. Heavy Metal Chelatin Resins - Important characteristics i 3.5 CU.FT. are: It has a higher se ectivity for heavy metals than INTERIOR does the weak acid cation resin so it can separate heavy a volume metals from high levels of water hardness in the 9 (structural Fibers, solution, reduced amounts of reagent are required for Inc. regeneration, it is the- most expensive resin type, and vessel-vinyester) removal of heavy metals. is effective above a solution pH of 4. 12 The ion exchange resins are housed in a canister which is attached to a drain pipe on the rinse tank (see Figure 2). The rinse solution flows through the canister, the metal is removed allowing the exiting water to flow to the sewer. when the .007"to.010"SLOTS exchange capacity of the canister (containing the resins) is IN DISTRIBUTORS. reached, it is replaced by a fresh one. Saturated canisters are transported to the Facility and regenerated. Regeneration is accomplished by flushing the resins with a concentrated acid or base solution, depending on the resin type, which effec- tively reverses the exchange reaction. — t PORTABLE O.I.UNIT A-3 Drawing of a typical enehange unit SCALE— DATE— DRAWING NO.— ,h..