冶金高盐含氰废水的零排放处理

Zero discharge treatment of metallurgical high salt and cyanide containing wastewater

冶金废水中由于含有氰化物,且水中含盐量高,一直没有很好的处理方法.通过对不同技术进行研究对比,优化采用多种技术有机耦合来分步处理冶金高盐含氰废水,臭氧氧化去除废水中的氰化物和部分COD,加药使废水中的金属离子、钙镁硬度沉淀分离,再用DTRO将废水浓缩减量,减量的废水二次臭氧氧化进一步去除废水中的氰化物,终端废水进MVR蒸发实现固液分离,DTRO透过液和MVR冷却水经进一步处理后返回工艺中回用,实现了废水的零排放.

Because of cyanide and high salt content in metallurgical wastewater, there is no good treatment method. Through the study and comparison of different technologies, this paper optimizes the use of variety of organic coupling technology to step-by-step treatment of metallurgical high-salt cyanide wastewater, ozonation removal of cyanide and COD in wastewater, adding chemical agents to make the metal ions, calcium and magnesium hardness precipitation in wastewater separation, and then using DTRO to concentrate wastewater reduction. Finally, the wastewater is evaporated by MVR to realize solid-liquid separation. DTRO permeate and MVR cooling water are further treated and reused in the process. The wastewater reaches zero discharge.