针对城市再生水的水质状况，国电吉林龙华长春热电一厂按照梯级用水原则，提高水的重复使用率，同时采用废水减量化技术，将最终的脱硫废水喷入锅炉烟道蒸发，真正实现全厂水的零排放。电厂零排水设计综合应用了如下技术：循环水优化采用旁流石灰处理系统，系统出水优先用于锅炉补给水，其余回送至循环水系统；锅炉补给水处理系统采用适应浓缩再生水的全膜水处理技术，显著降低全厂的废水量；将一级反渗透浓水和石灰处理系统的排浆水送至烟气脱硫系统重复使用。零排水模式下，烟气脱硫系统工艺水补水种类较多，水质比较复杂，需要针对来水水质选择合适的重复使用场合，同时零排水对电厂的水务管理提出了更高的要求，必须加强全厂的水务管理。

According to the quality of municipal reclaimed water, the cascade water principle is implemented in Guodian Changcun No.1 Cogeneration Power Plant to improve the water reuse rate, and the waste water reduction technology that waste water during desulfurization process being sprayed into boiler flue to evaporate, has been applied to achieve zero water emission in the whole plant. The design of zero water emission in power plant adopts the technologies as follows: the circulated water used bypass lime treatment system, whose effluent is preferred for boiler makeup water, the rest is back to the circulated water system; the boiler makeup water treatment system uses integrated membrane treatment technology which adapted to the concentrated reclaimed water and could significantly reduced the amount of waste water; Ⅰ reverse osmosis concentrate and pulp of lime treatment system are sent to the flue gas desulfurization system for repeated use. In the zero water emission mode, there were many types of makeup water in the flue gas desulfurization system and the water quality is complicated. So the choose of repeated application should be determined according to the water quality condition. Meanwhile, in the zero water emission system higher requirements are imposed towater management of power plant.