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Series 9500 Reactor/Or&ifier <br /> Operations &Maintenance <br /> Page 1 <br /> INTRODUCTION <br /> The IPEC Series 9500 Reactor/Clarifier is an automated system which monitors, <br /> makes chemical additions,blends, and settles continuous dilute waste waters from <br /> processing o erations. It may be used to simply neutralize water (change pH) <br /> pnor to senXing to sewer or fo effectuate a metal precipitation (e.g., change Nickel <br /> Sulfate to Nickel Hydroxide) which is settled through the clarifier section and then <br /> removed through the bottom to a filter press for further dewatering. <br /> Metal removal is accomplished by taking a dissolved metal salt solution (such as a <br /> Plating solution)), which is ttyyppicaIly acidic (pH 3-5), then raising the pH of the <br /> S, to 7-10 by the use ofsodium hydroxide. This changes the metal salt to a <br /> metal hydroxide which is highly insoluble in water (see solubility chart). This <br /> causes the metal ion to precipitate out and be settle in the clarifier. <br /> Some metals, such as hexavalent chrome solutions, cannot beprecipitated by <br /> directly raising the pH. The chromium must first be reduced from +6 chrome to <br /> +3 chrome. The pH may then be raised to allow precipitation. This chrome <br /> reduction is accomplished by first lowering the pH to-1-2, then adding sodium <br /> metabisulfite or sodium bisulfite until the reduction is complete -which is <br /> controlled by an ORP controller. <br /> Some solutions contain metals in accyyanide form. Again direct pH adjustment will <br /> not precipitate these metals. Cyanide destruct is accompplishedby first raising the <br /> pH of the solution to 10 to 11. Sodium Hypochlorite is fhen added in the firsf <br /> stage of the reaction. H is then lowered to 8.5 to 9 and reacted again with sodium <br /> hypochlorite to complete the process. pH is then raised to 10 to 11 for metal <br /> precipitation. <br /> WARNING:When using the Series 9500 for Cyanide Destruct, the Unit must be <br /> well ventilated since there is a possibility that if used improperly lethal hydrogen <br /> yanide gas maybe liberated. This will occur if the pH of the cyanide solution is <br /> lowered through the addition of acid prior to the hypochlorite treatment. <br /> - An <br /> . _ IPEC <br /> WATER PoLLU77ONCONTROL SYSTEMS <br /> 1884 W.Pomona Rd. <br /> Corona, Ca. 9.1720 <br /> .. (909)270-0333 PAX(909)270.0336 <br />