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由于陶瓷膜材料对机械、化学和热应力有极好的抵抗作用,陶瓷膜技术已经成为膜应用领域中最具发展前景的技术之一。然而,膜除垢仍然是阻碍其广泛应用的一项重要课题。空气纳米气泡因其具有高传质效率,可以在陶瓷薄膜过滤过程中阻碍污垢形成。本研究在小试和中试过程中,采用空气纳米气泡方法进行陶瓷薄膜过滤抵抗污垢试验。用腐殖酸模拟膜表面的有机污垢,在6h之内完全堵塞膜。通过直接向膜内部注入空气纳米气泡进行膜的除垢(清洁)过程。用原子力显微镜观察处理前后的影像,可以看出空气纳米气泡对陶瓷薄膜的表面有极好的清洁作用。渗透通量恢复到原始水平,例如压力为275.8k Pa时,渗透通量为26.7×10~(-9)m~3·(m~2·s)~(-1),这说明空气纳米气泡成功地清除了膜气孔中的堵塞物。将陶瓷薄技术和空气纳米气泡体系相结合是一种具有创新性、可持续发展的潜在技术。
Ceramic membrane technology has become one of the most promising technologies in the field of membrane applications due to its excellent resistance to mechanical, chemical and thermal stresses. However, membrane descaling is still an important issue that hinders its widespread application. Air nanobubbles, because of their high mass transfer efficiency, can hinder the formation of fouling during filtration of ceramic membranes. In this paper, in the process of pilot and pilot test, the air nanobubbles method was used to filter the ceramic membrane against fouling. Humic acid mimic the surface of the organic dirt, completely blocked the membrane within 6h. The membrane descaling (cleaning) process is performed by injecting air nanobubbles directly into the interior of the membrane. Using atomic force microscope to observe the image before and after treatment, it can be seen that the air nanobubbles have an excellent cleaning effect on the surface of the ceramic film. For example, when the pressure is 275.8k Pa, the permeate flux is 26.7 × 10 -9 m 3 · m -3 · s -1, which shows that the air nanobubble The clogged pores in the membrane were successfully removed. The combination of thin ceramic technology with an air-based nanobubble system is an innovative and sustainable technology.