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

doi:10.11930/j.issn.1004-9649.2016.02.153.06

Abstract

Abstract: 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 Ca2+, Mg2+ 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 process. 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.

Key words: thermal power plant, FGD wastewater, pretreatment, particle size distribution, crossflow microfiltration, softening

CLC Number:

X77
TM621.8

LIU Yapeng, WANG Jinlei, CHEN Jingshuo, MAO Jin, WANG Jing. Optimization of FGD Wastewater Pretreatment Technique for Thermal Power Plant and Test Studies on Tubular Crossflow Microfiltration Process[J]. Electric Power, 2016, 49(2): 153-158.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.02.153.06

https://www.electricpower.com.cn/EN/Y2016/V49/I2/153

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