学术
摘 要:
研究了40kHz超声波处理器在特定声强（1700和2700w／m^2）下对聚偏氟乙烯（PVDF）中空纤维膜组件的破坏情况、浸泡时间对清洗效果的影响、超声协同化学浸泡对膜的清洗效果和超声抑垢过程．得出普通清洗方法清洗时间以6h最佳，通量提高率为19．2％；利用超声辅助清洗，通量提高率为71％．在抑垢试验中，膜初始通量（纯水通量）为48．6L／（m^2·h），在无超声及无曝气条件下，使用180mm后，通量降至37．26L／（m^2·h），为初始通量的67．4％；当开启声强为270W／m^2及曝气和600w／m^2超声及曝气后，超滤180min，膜通量为43．16和45．36L／（m^2·h），为初始通量的89．7％和94％，均好于未开超声时的效果．高的声强，抑垢效果好．[著者文摘]
文章出处:
《膜科学与技术》-2008年28卷1期 -81-85页
栏目信息:
文献标识码:
A
文章编号:
1007-8924（2008）01-0081-05
Ultrasound assisted-cleaning polyvinylidene-fluoride ultrafiltration membrane and scale inhibiting
Jin Wei, WANG Bin, GUO Wei, LU Xiaoping（Institute of Sonochemical Engineering, Nanjing University of Technology, Nanjing 210009, China）
Abstract:
The effect of ultrasound on the breakage of membrane module was investigated at fixed ultrasonic intensities of 1 700 W/m^2 and 2 700 W/m^2 of 40 kHz. The effects of dipping time, assisted ultrasonic cleaning and scale inhibiting were also examined. The results show that flux improvement was 19.2% or 71% without or with ultrasound treatment respectively, when the optimum dipping time was 6 h. Ultrasound enhances the flux and restrains fouling. The initial flux of water was 48.6 L/（m^2· h）. After ultrafiltration and restraining membrane fouling for 180 minutes, the flux reduced to 37.26 L/（m^2·h）, which was 67.4% of the initial flux when there was no ultrasound and aeration; with power intensities of 270 W/m^2, 600 W/m^2 and aeration, the fluxes reached 43.16 L/（m^2·h） and 45.36 L/（m^2·h）, which were 89.7% and 94% of the initial one, respectively. These results were better than those without ultrasonic. Results also confirm that different ultrasound intensities could lead to differences of scale inhibiting; a higher intensity can give better cleaning results.[著者文摘]
Key words:
ultrasound; membrane cleaning; polyvinylidene-fluoride; ultrafiltration membrane
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