摘要
针对陶瓷膜洗涤超细TiO2粉体中Cl-的过程,确定了适合的跨膜压差和膜表面流速,并采用阻力系列模型分析膜污染机理,确定有效的膜再生方法。此过程渗透通量随跨膜压差和膜表面流速的增长而增长,但是增长幅度减缓。合适的跨膜压差和膜表面流速分别为0.10—0.15 MPa和2.0 m/s;主要的膜污染来自粉体在膜表面的沉积;单一的化学和物理清洗方法无法达到理想的清洗效果,采用纯水浸泡、超声波清洗和质量分数0.5%的HCl清洗可使纯水通量恢复至新膜的72%以上,且多次的清洗效果稳定。
The optimum trans-membrane pressure drop and cross-flow velocity were determined in the process of washing Cl^- in ultrafine TiO2 powder by ceramic membranes. The membrane fouling mechanism was analyzed by resistance-series-model, and the effective cleaning methods were selected for membrane regeneration. The permeate flux increases with the increasing of trans-membrane pressure drop and cross-flow velocity, but the increasing extent is decreasing. The optimum values for pressure difference and velocity are 0. 10-0. 15 MPa and 2. 0 m/s respectively. The major fouling resistance is the powder sedimentation on membrane surface, which can not be cleaned by one-step cleaning. The muhi-step and chemical cleaning original ones, and the with the mass fraction cleaning methods, including pure water soaking, ultrasonic cleaning 0.5% HCl, can recover the permeate flux more than 72% of the cleaning effect is stable.
出处
《化学工程》
CAS
CSCD
北大核心
2009年第10期39-42,共4页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(20406007)
2006年江苏省精细石油化工重点实验室基金资助项目
关键词
超细TIO2
粉体
洗涤
膜污染机理
膜再生
ultrafine TiO2 powder
washing
membrane fouling mechanism
membrane regeneration
