【作者】 王晓丽； 陈蕊； 高博； 傅学起；

【Author】 WANG Xiaoli,CHEN Rui,GAO Bo,FU Xueqi (College of Environmental Science & Engineering,Nankai University,Tianjin 300071,China)

【机构】 南开大学环境科学与工程学院；

【摘要】 超声波清洗技术用于清洗酵母菌溶液和大豆分离蛋白(ISP)溶液污染的聚偏氟乙烯(PVDF)微滤膜.实验中所用的超声波频率为40 kHz,超声波的强度为1.43～2.85 W/cm~2.实验结果表明:对于酵母菌溶液污染的微滤膜超声波辅助水洗是恢复水通量的有效方法;而且超声波强度越高,达到相同水通量恢复率(FR)的清洗时间t,较短;但对于大豆分离蛋白溶液污染的微滤膜单纯超声波辅助水洗的效果相对较差,而超声波辅助NaOH溶液的化学清洗的效果较好,在浓度为3 g/L的NaOH溶液超声波辅助清洗6 min即可使其FR值达到91%.更多还原

【Abstract】 Ultrasound(US) cleaning technique was applied to remove fouling of PVDF microfiltration(MF) membrane,which was used to treat yeast cell and isolated soybean protein(ISP) solution,respectively.The US employed had 40 kHz frequency and the output power of 1.43 - 2.85 W/cm~2.The evolution of the cleaning effect is followed by the measurements of the flux recovery rate(FR) and the cleaning time.Results showed that the membrane property,which was fouled by yeast cell solution,could be recovered by water cleaning with US irradiation.And the cleaning time achieved the same FR decreased with the increase of US intensity.For the membrane fouled by ISP solution,however,it took long time to achieve the high FR with ultrasound - associated water cleaning.In addition,it was found that chemical cleaning associated with US irradiation could distinctly enhanced the cleaning efficiency,which was able to restore 91%of the original membrane’s water permeability within 6 min when a combination of 0.3%sodium hydroxide and the output power of 1.43 W/cm~2 US irradiation was used to cleaned the membrane.更多还原