Recycling of Water and Chromium(zI) from Wastewater by Chromate(III) Treatment Using UV Ozone Oxidation and Ion Exchange Resin Method

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  • ＵＶ照射併用オゾン酸化とイオン交換法による３価クロメート処理排水の再利用およびクロムの再資源化
  • UV ショウシャ ヘイヨウ オゾン サンカ ト イオン コウカンホウ ニ ヨル 3カ クロメート ショリ ハイスイ ノ サイリヨウ オヨビ クロム ノ サイシゲンカ

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Abstract

Wastewater containing Cr3+ and organic matter from chromate(III) treatment was oxidized by ozone combined with ultraviolet (UV) radiation. The treated water containing Cr6+ after the oxidation process was purified by passing through a cation exchange resin column and then through an anion exchange resin column. This combined process increased the production of pure water volume compared to a single process using an ion exchange resin. Electric conductivity of effluent water from the anion exchange resin column was less than 20 µS/cm. This deionized water can be reused as rinsing water in the chromate(III) treatment process.<br>Concentrated Cr6+ discharged upon regeneration of the anion exchange resin was refined by a new ion exchange resin method which was developed in order to exclude chloride ions selectively. Cr6+ solution with high purity and low contents of chloride ion was recovered from this solution. Based on these experiments, we devised a practical recycling system by which water in toxic Cr6+ wastewater can be reused as de-ionized water on an industrial scale at a plating factory, and Cr6+ in the wastewater can be recovered as raw material for chromium products.

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