火电厂脱硫废水预处理工艺优化及管式微滤膜实验研究  

Optimization of FGD Wastewater Pretreatment Technique for Thermal Power Plant and Test Studies on Tubular Crossflow Microfiltration Process

作　　者：刘亚鹏[1] 王金磊[2] 陈景硕 毛进[1] 王璟[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]西安科技大学材料科学与工程学院,陕西西安710054 [3]华能国际电力股份有限公司,北京100031

出　　处：《中国电力》2016年第2期153-158,共6页Electric Power

基　　金：华能国际电力股份有限公司科学技术项目(HNKJ14-G27)~~

摘　　要：针对脱硫废水的水质特点,在系统考察4种脱硫废水预处理工艺(CaSO_4晶种法、FS-66药剂法、Ca(OH)_2+Na_2CO_3联合工艺、NaOH+Na_2CO_3联合工艺)的基础上,探索了预处理后脱硫废水在管式膜错流微滤过程中悬浮物颗粒粒径的变化规律及其对产水水质的影响。研究结果表明:NaOH+Na_2CO_3联合工艺为最佳的脱硫废水预处理工艺,该工艺对脱硫废水中的Ca^(2+)、Mg^(2+)及全硅具有优异的去除效果:在所设计的试验条件下,悬浮物颗粒的平均粒径从14.5μm降至5.1μm,微滤产水通量及出水水质均较为稳定,微滤产水经进一步脱盐后可以回用。研究成果为电厂脱硫废水深度处理奠定了基础。Considering the quality characteristics of FGD wastewater, the variations in particle size distribution of the pretreated-FGD wastewater and their effects on effluent quality during the tubular crossflow microfiltration process are studied based on the systematic analysis on four different pretreatment methods （i.e. calcium sulfate seeding technique, FS-66treatment, combination of calcium hydroxide and sodium carbonate, combination of sodium hydroxide and sodium carbonate）. The results indicate that the combination of sodium hydroxide and sodium carbonate is the best pretreatment method compared with three other methods, which excels in the removal of Ca^2＋, Mg^2＋ and total silica. Under the designed testing conditions, the average particle size decreases rapidly from 14.5 μm to 5.1 μm. Meanwhile, both the flux and quality of water produced from microfiltration are quite stable during the entire experimental precess. After further desalination the water can be even recycled and reused. This result has established the foundation for advanced FGD wastewater treatment of thermal power plants.

关 键 词：电厂 脱硫废水 预处理 粒径分布 错流微滤 软化 

分 类 号：X773[环境科学与工程—环境工程]