摘要
通过调节挤出头的尺寸和拉伸倍数,制备出4种不同壁厚和孔径的聚四氟乙烯(PTFE)中空纤维膜。将PTFE中空纤维膜制成膜组件,采用真空膜蒸馏(VMD)技术处理浓海水。研究了PTFE中空纤维膜的壁厚和孔径、料液温度和流速、冷侧真空度等对产水通量和脱盐率的影响。结果表明:减小膜丝壁厚、增加膜孔径、提高料液温度、料液流速和冷侧真空度均可增加产水通量。但产水通量随浓缩倍数的增加而减小。整个实验过程中,4种PTFE中空纤维膜的脱盐率均保持在99.5%以上,且不受操作条件的影响。
Four kinds of polytetrafluoroethylene（PTFE）hollow fiber membranes with different wall thicknesses and pore sizes were prepared through changing the parameters of extrusion die head and stretching ratios in this paper.Membrane module was made with PTFE hollow fiber membrane.Vacuum membrane distillation（VDM）technique was adopted to treat concentrated seawater.The effects of wall thickness and pore size of PTFE hollow fiber membrane,feed liquid temperature and flow rate as well as vacuum degree at cold side on penetration flux and desalinization ratio were studied.The results show：penetration flux can be increased through the following methods：reducing wall thickness of PTFE hollow fiber membrane;increasing pore size of the membrane;boosting feed liquid temperature,feed liquid rate and vacuum degree at cold side.But penetration flux decreases with the rise in concentration multiple.In the whole experiment,desalinization ratio of the four PTFE hollow fiber membranes maintains above 99.5%.Besides,the operation conditions have little effects on desalinization ratio.
出处
《浙江理工大学学报（自然科学版）》
2014年第4期383-388,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家科技支撑计划(2013BAC01B01)
教育部新世纪优秀人才支撑计划(NCET-10-0980)
浙江省重大科技专项重大社会发展项目(2012C13006-2)
浙江省公益性技术应用研究计划项目(2012C21027)
关键词
PTFE中空纤维膜
真空膜蒸馏
浓海水
PTFE
hollow fiber membrane
vacuum membrane distillation
concentrated seawater
