Resintech Incorporated

Pentair Filtration Solutions, LLC

Michael C Gottlieb

Peter S Meyers

Gary L Hatch

Carl Galletti

Rajendra K Mody

A method of removing chromium from water using a weak base anion exchange resin at a pH above about 5 includes the step of periodically reducing a flow of the water through the ion exchange resin for a rest period, such that a secondary mechanism of chromium removal predominates, wherein chromium ions are removed from the weak base anion exchange groups and precipitated inside the ion exchange resin. In an alternative embodiment, rather than resting, the ion exchange resin is periodically conditioned with an acid so as to enhance the secondary mechanism.

Method for removing chromium from water using weak base anion exchange resin at near-neutral pH

Disclosed are water treatment systems and methods that are characterized by reduced leaching of color-bearing material (i.e., color-bearing leachates) into effluent water. The disclosed systems and methods may include or utilize filtering systems comprising selected mixed ion-exchange resin beds of a strong acid sulfonated cation exchange resin and an anion exchange resin.

Filtering systems and methods characterized by reduced color throw

The present invention relates, generally, to the art of impregnating metal complexes into anion exchange materials to provide improved anion exchange materials with a metal inside the materials such that the modified materials effectively and efficiently remove or recover various metals, including metal containing complexes, compounds, and contaminants, such as arsenic, from, for example, process solutions, effluents and aqueous solutions. Uses for the improved anion exchange materials are also described as are methods of making modified anion exchange materials, and methods of removing and recovering at least one metal or contaminant from a source.

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Cherry Hill, NJ, United States of America

Michael C Gottlieb