Authors have developed the new treatment technique for hexavalent chromium (Cr6+) in the liquid waste. Cr6+ can be reduced to trivalent chromium (Cr3+) by hydrogen peroxide (H2O2) under acidic condition with small amount of secondary waste. In 2010, this technique was applied to the cooling water for iron-water shield surrounding the core region in Fugen Nuclear Power Station of Japan Atomic Energy Agency (JAEA). The concentration of Cr6+ and total chromium (Cr) were reduced to less than 0.5ppm and 2.0ppm in liquid waste, respectively. These values satisfy the water pollution prevention law.

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