Heavy metal wastewater treatment method

The invention discloses a heavy metal wastewater treatment method. The method comprises the following steps of: (1) removing iron, namely, adjusting the pH of wastewater to 4 to 5, adding a flocculantto remove iron ions in the wastewater through sedimentation; (2) precipitating copper, namely, adding sodium sulfide and a flocculant to the supernatant obtained after the treatment in the step (1),so as to remove copper ions in the waste water through sedimentation; and (3) performing neutralizing, namely, adjusting the pH value of the supernatant obtained after the treatment in the step (2) to6-7, adding a flocculant, so as to remove heavy metal ions in the wastewater through sedimentation and further to obtain clear water which meets the standards and can be discharged. The method of thepresent invention can effectively remove heavy metals from the wastewater and make the wastewater meet the discharge standards. 本发明公开了种重金属废水的处理方法，包括如下步骤：（1）除铁作业，调节废水的pH值至4-5，加入絮凝剂，沉降去除废水中的铁离子；（2）沉铜作业，向经步骤（1）处理后的上清液中加入硫化钠和絮凝剂，沉降