燃煤电厂脱硫废水处理工艺试验研究

为了降低燃煤电厂脱硫废水零排放的处理成本,通过中试试验,研究了脱硫废水经过药剂软化预处理+管式超滤+碟管式反渗透(DTRO)浓缩+蒸发结晶工艺的技术可行性,摸索了各工艺段的关键运行参数。试验结果表明:预处理投加石灰阶段,p H控制在10.5~11时,水中镁离子去除效果较好,且可以去除水中大部分重金属及F-。管式超滤和DTRO抗污堵性较好,能够将废水进行减量化处理,回收率控制在65%~70%。系统稳定运行,浓水可以进入蒸发结晶系统,使蒸发水量减少50%~60%,投资和运行成本都有所降低。

Experimental study on concentration treatment process of desulfurization waste water in coal-fired power plant

In order to reduce the processing cost of zero-discharge of desulfurization waste water from coal-fired power plant,through the experiment in this paper,the technical feasibility of process in concentrating desulfurization waste water throuth pretreatment of softening and tubular ultrafiltration and DTRO and evaporation and crystallizationby experiment were studied,the key operation of each process parameter were explored.The experimental results showed that the pretreatment of lime,pH varying from 10.5 to 11,magnesium ion removal effect was good,and it could remove most of heavy metals and lluoride,The anti fouling performance of tubular ultrafiltration and DTRO was better,and the waste water could be reduced and the recovery rate was controlled between 65％ and 70％,and the system could be operated stably,concentrated water could be entered the evaporation and crystallization,the evaporation of water was reduced by 50％-60％,and the investment and operation cost were reduced to a certain extent.