火电厂脱硫废水资源化回用处理工艺研究  

Study on the Resource Recycling and Reuse Treatment of Desulfurization Wastewater in Power Plant

作　　者：毛进[1] 张志国 连坤宙[1] 刘亚鹏[1] 袁国全[1] 黄倩[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]国家电投集团河南电力有限公司技术信息中心,河南郑州450001

出　　处：《水处理技术》2017年第6期41-44,64,共5页Technology of Water Treatment

摘　　要：为解决现阶段脱硫废水回用及零排放工艺投资成本、运行费用高的问题,根据脱硫废水水质特点,提出超滤-纳滤-反渗透-电解制氯的脱硫废水资源化回用工艺,并通过中试对工艺中的核心系统超滤、纳滤系统进行可行性研究。结果表明,超滤-纳滤系统可有效将脱硫废水中1价离子、2价离子进行分离,1价离子进入纳滤产水,2价离子截留在纳滤浓水中,超滤出水浊度、SDI分别<0.5 NTU、<3,纳滤1价离子透过率在20%~30%,2价离子SO_4^(2-)、Mg^(2+)、Ca^(2+)透过率分别<0.2%、<2.5%、<9%。纳滤产水浓缩后电解制氯,纳滤浓水直接回至脱硫塔,实现脱硫废水的资源化利用以及零排放。In order to solve the problem of high investment and operating costs of desulfurization wastewater reuse and zero emission process at the present stage, according to the characteristics of desulfurization wastewater, this article proposed the ultrafiltration-nanofiltration-reverse osmosis-electrolyzed chlorination process for the reuse of desulfurization wastewater and then study the feasibility of the core ultrafiltration and nanofiltration systems in the process by pilot plant test. The results showed that ultrafiltration-nanofiltmtion systems could be effective in the separation of monovalent ions and divalent ions in desulfurization wastewater. The former entered into the nanofiltration effluent and the latter was intercepted in the concentrated water. And the turbidity and SDI ofnanofiltration effluent was less than 0.5 NTU and 3, and the transmittance of monovalent ions was between 20%-30%, and the transmittance of SO4^2, Mg^2＋ and Ca^2＋ were less than 0.2%, 2.5% and 9% respectively. The produced water by nanofiltration was concentrated to electrolyze chlorination and the concentrated water was directly returned to the desulfurization tower so that to realize the resource utilization and zero emission of desulfurization wastewater.

关 键 词：脱硫废水 超滤 纳滤 反渗透 电解制氯 资源化回用 

分 类 号：X773[环境科学与工程—环境工程]