燃煤火电厂高盐废水的处理

介绍了一种高盐废水零排放工艺，通过对常规废水零排放后期处理流程的重新设计，以方法最优，效益最大化为目的，论证流程中各重要环节，确立实际组合工艺采用化学软化—管式微滤—纳滤—反渗透（RO）—碟管式反渗透（DTRO）—蒸发结晶系统（盐硝分产）的处理路线，分别回收Na₂SO₄和NaCl。同时，通过多种检测手段，确定氯化钠质量达GB/T 5462—2015《工业盐》的优级品等级，实现对外销售，真正达到零排放、零污染。

TREATMENT OF HIGH-SALT WASTEWATER FROM COAL-FIRED THERMAL POWER PLANTS

This paper described an optimal zero-emission process for high-salt wastewater. Through redesign of the post-treatment process of the conventional wastewater zero-emission process, with the aim of optimizing the method and maximizing the economic benefits, various methods of the important steps in the process were demonstrated and screened, and the actual process was established as chemical softening-tube microfiltration-nanofiltration-reverse osmosis (RO)-dish-tube reverse osmosis (DTRO). The combined route of the evaporative crystallization system (for salt nitrate production) was applied to recover Na₂SO₄ and NaCl sequentially. Multiple detection methods was used on the generated NaCl through crystallization, and the quality of sodium chloride product was proved to reach the superior grade of Industrial Salt (GB/T 5462—2015), and the external sales were realized. Zero pollution and discharge were truly achieved by the total recycling of wastewater.