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Color Reduction

Color reduction by coagulants or adsorbants is accomplished by complexation and/or destabilization of the color bodies.  A wide variety of coagulants have been examined for this purpose. Color removal with coagulants is mechanically similar to common techniques for water purification, where coagulants have been used for decades to reduce both turbidity and color.

Each application needs to be screened individually, as the requirements for removal efficiency can vary significantly.  For inorganic coagulants, pH is a very important variable for effective color removal.  In the case of alum, a pH of 5-6 is usually necessary to achieve reasonable color removal. The incoming water is often alkaline, so a distinction must be made between the need for acidity and actual coagulant demand.  While a coagulant such as alum or an iron salt can lower the pH to the desired level, it can add to chemical sludge generation unnecessarily if the gap between acidity demand and coagulant demand is large.  Aluminum and iron coagulants are available with a variety of free acid levels.  These maintain the convenience of a single feed point without unnecessary additional chemical sludge generation.

In some cases, Hyper+Ion can achieve good color removal without requiring the pH of the water to be reduced.  The coagulant type and dosage required for treating any specific raw water must be determined by onsite product evaluation.  Our product application specialists can work with you to determine the best solution.

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