摘要
采用NF270和GE DK纳滤膜,在不同压力、温度和pH条件进行纯水过滤试验,以测定不同条件下两种纳滤膜的膜通量,并研究不同条件下的纳滤膜渗透系数变化规律;构建纳滤膜渗透系数与热力学参数之间的关系式,计算两种纳滤膜的热力学参数,分析两种纳滤膜分离过程热力学原理.结果表明:两种纳滤膜的膜通量随着温度和压力的增加而增大,两种纳滤膜的渗透系数随着温度升高而增大,并随着压力和pH的变化呈现小幅波动;GE DK纳滤膜的活化能高于NF 270纳滤膜的活化能,分别为16.56kJ/mol和14.22kJ/mol.由此可知,在分离过程中GE DK纳滤膜比NF 270纳滤膜需更高的运行压力.
Two nanofiltration（NF）membranes,NF 270 and GE DK,were tested for the filtration process in pure water system at different temperatures,operating pressures and pH for water.The fluxes of the two NF membranes were determined,and the variations of pure water permeability coefficient of NF membranes were discussed.The relationship between pure water permeability coefficient of NF membranes and thermodynamic parameters were conducted and the thermodynamic parameters of the two types of NF membranes were calculated.Following that,the principle of the filtration process of NF membrane was discussed.The experimental results show that the fluxes of the two NF membranes increased with increasing the temperature and operating pressure.The pure water permeability coefficient of both NF membranes also increased with increasing the temperature and fluctuated within a narrow range with the change of operating pressure and pH for water.The activation energy of GE DK membrane is higher than that of NF 270 membrane,16.56kJ/mol and 14.22kJ/mol,respectively.This indicates that GE DK membrane requires more energy to run than NF 270 membrane.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2014年第5期79-83,共5页
Membrane Science and Technology
基金
科技部
财政部国家中小企业创新基金
武汉大学博士创新基金的资助
关键词
纳滤膜
热力学
纯水体系
NF membrane
thermodynamics
pure water system
