摘要
开发了选择性电渗析中试系统,浓缩处理某燃煤电厂湿法脱硫系统排污废水。研究了电流密度、进水水质和浓淡水产水量对脱硫废水浓缩效果的影响,考察了系统连续运行期间的稳定性和经济性。结果表明,选择性电渗析系统能够高效处理并资源化回用不同水质的脱硫废水,使Cl^(-)等污染物在浓水富集,且不会使SO_(4)^(2-)发生大量迁移,连续运行6个月以来膜堆未发生结垢或污堵。高电流密度条件下减小淡水产水水量能够有效提高淡水产水水质,浓水产水量的控制需综合考虑浓缩效果、离子迁移效率和结垢情况。连续运行期间,淡水产水回收率达到70%~80%,吨水平均处理电耗为11.0 kWh,吨水平均处理成本为4.4元,有效降低了燃煤电厂废水“零排放”工艺运行成本。
A selective electrodialysis pilot system is developed to concentrate and treat with the wastewater from the wet desulfurization system of a coal-fired power plant. The effects of current density,influent water quality and water yield on the concentration effect of the system to desulfurization wastewater are studied,and the stability and economy of the system during continuous operation are investigated. It is shown that the selective electrodialysis system can efficiently treat and reuse desulfurization wastewater with different water quality,make Cl^(-) and other pollutants accumulate in the concentrated water,but does not cause large amount of SO_(4)^(2-) migration. There has been no fouling in the membrane stack for 6 months of continuous operation. Under high current density,reducing fresh-water yield can effectively improve the quality of produced water,and the control of concentrated water yield should consider the concentration effect,ion migration efficiency and scaling condition. During the continuous operation period,the recovery rate of fresh water reaches70% - 80% ,the average power consumption per ton wastewater is 11. 0 k Wh,and the average treatment cost per ton wastewater is CNY4. 4,which effectively reduces the operation cost of“zero discharge”process of wastewater from coalfired power plant.
作者
徐浩然
封立林
李强
欧阳丰
冯向东
吕佳慧
XU Hao-ran;FENG Li-lin;LI Qiang;OUYANG Feng;FENG Xiang-dong;LV Jia-hui(Zhejiang Energy Group R&D Institute Co.,Ltd.,Hangzhou 311121,China;Zhejiang Provincial Engineering Center for New Industrial Water Resources,Hangzhou 311121,China;Zhejiang Zheneng Electric Power Co.,Ltd.,Hangzhou 310007,China;Zhejiang Zheneng Shaoxing Binhai Thermal Power Co.,Ltd.,Shaoxing 312073,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第7期236-240,共5页
Modern Chemical Industry
关键词
选择性电渗析
中试
脱硫废水
燃煤电厂
浓缩
selective electrodialysis
pilot
desulfurization wastewater
coal-fired power plant
concentrate