| 摘要 |
PURPOSE: A simultaneous removing method of heavy metal ions in acidic effluent is provided to save a cost by using remarkably less amount of calcium hydroxide or caustic soda which are used as a neutralizing agent and to suppress a generation of sludge caused by using a neutralizing agent. CONSTITUTION: A simultaneous removing method of heavy metal ions in acidic effluent comprises the following steps. A step of homogenizing acidic effluent; a step of passing the homogenized acidic effluent through the column in which AOD (Argon Oxygen Decarburization) slag is charged; a step of precipitating and removing the heavy metal ions which is not removed by adding caustic soda or calcium hydroxide to adjust pH to be 9; and finally a step of adjusting pH to be around 7. [Reference numerals] (AA) Water collecting tank; (BB) AOD slag filled column; (CC) Caustic soda, slaked lime; (DD) Sulfuric acid, caustic soda; (EE) Neutralizing tank; (FF) PH adjusting tank; (GG) Process water |
