THE RECYCLING SYSTEM OF CHROMIUM(VI) IN WASTE-WATER CONTAINING CHROMIUM BY ION-EXCHANGE RESIN

A study was accomplished over recycling system of chromium(VI) in wastewater from the plants handling chromium(VI) by ion exchange resin. An anion exchange resin selectively adsorbing chromium(VI) was adopted in the Cl-form to prevent from the hydroxide precipitation owing to the rise in pH during treatment. Effects of pH and Cl-, SO42-, Cr(III) contents in treated water on adsorption of chromium (VI), and differences between one bed method and two beds method were investigated to develop a process, which can adsorb chromium(VI) to an ion exchange resin effectively and perfectly. With a centralized regenerating process in industrial scale, the resins are perfectly regenerated and the chromium(VI) solution with high content and low impurity is recovered. This solution can be recycled as the raw material of chromium compounds.