电镀废水处理工程设计实例

在实际工程中,采用何种方法处理电镀废水,需要根据具体条件加以考虑.讨论了含铬废水、含氰废水、酸碱重金属废水的处理方法和原理,结合西安某厂电镀废水处理的具体改造工程,设计了一套电镀废水的处理工艺流程,确定以化学还原法处理含铬废水,以碱性氯化法处理含氰废水,以碱性沉淀法处理酸碱重金属废水.整个工程处理设备较少、造价低、效果稳定,能承受大水量和高浓度负荷的冲击,出水水质达到国家污水综合排放标准.

An Example for the Project Design of Electroplating Wastewater Treatment

Though there are many methods for the wastewater treatment of electroplating effluents, it is essential to choose the proper processes in practical project by taking into account the different working conditions. Thus the methods and principles for the treatment of the wastewater containing cyanogens, chromium, and heavy metals were discussed. And a set of treatment process was designed to realize the efficient treatment of the electroplating wastewater containing cyanide, chromium, and heavy metals, in a specific project having the distinguished features such as less installations, low cost, steady effect, and endurance to huge rate of flow and burden concentration. The Cr containing wastewater was therefore treated using a chemical reduction method, the cyanide was removed using alkaline chloridizing method, and the heavy metals were disposed using alkaline precipitation method. The field test results indicated that the effluent after being treated with the established processes passed national integrated wastewater discharge standard GB 8978-1996.