Abstract: Taking the highly concentrated saline wastewater produced by sodium alkali desulfurization method as treatment object,the process of coagulation + forced oxidation + chemical precipitation + ultrafiltration + chelating resin + electrodialysis concentration + bipolar membrane electrodialysis has been used for the regeneration of highly concentrated saline wastewater,realizing zero discharge of high salinity wastewater and cyclic utilization of sodium alkali resource. The concentration of sodium hydroxide solution obtained from the regeneration could meet the requi-rements for its reuse for the desulfurization tower. Under suitable operating conditions,the regenerated electricity con-sumption is 1.34-1.43 kW·h/kg.

Key words: desulfurized solution, saline wastewater, regeneration, zero discharge

摘要： 以钠碱脱硫法产生的高浓度含盐废水为处理对象，采用混凝沉淀+强制氧化+化学沉淀+超滤+螯合树脂+电渗析浓缩+双极膜电渗析工艺流程进行再生，实现了含盐废水零排放和钠碱资源的循环利用。再生得到的氢氧化钠溶液浓度满足回用于脱硫塔的要求。在适宜的操作条件下，再生部分电耗1.34~1.43 kW·h/kg。

关键词: 脱硫液, 含盐废水, 再生, 零排放

CLC Number: 

• X703