The method for treating the drainage from the decontamination work of the metal surface in the primary coolant circuit (12) of the nuclear reactor (14) comprises: oxidizing a predetermined amount of the solution from the primary coolant circuit (12) and the primary coolant circuit; (12) discharging to a reducing zone (16) connected with, (12) reacting the oxidizing agent with a reducing agent to form a reaction solution not containing the oxidizing agent, to form a desalted solution The steps include passing the reaction solution through an ion exchange resin, and returning the desalted solution into the primary coolant and / or disposing of the desalted solution. A wastewater treatment device (10) for carrying out the above method is also provided. [Selected figure] Figure 1
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