摘要
利用疏水性聚偏氟乙烯(PVDF)中空纤维膜及组件开展膜无泡曝气研究。通过检测膜组件的泡点,发现一定浸没深度下静水中膜组件的泡点高于紊流状态下的,且泡点随水流速度的增大而减小。考察水力条件和曝气压力对曝气效果的影响,并与常规曝气头曝气作比较。结果表明:将气压控制在泡点以内时,充氧能力随液体循环流量的增大、气压的升高而增强;而当气压超过泡点时,供氧初期充氧能力显著,但随曝气时间的延长增幅降低。中空纤维膜的曝气性能优于曝气头的。
Bubbleless aeration was carried out with hydrophobic polyvinylidene fluoride （PVDF） hollow fiber membrane. By detecting bubble point of membrane module, it is found that the bubble point in still water is higher than that in turbulent flow at a specified depth. Furthermore, the bubble point is decreased with the increase of water flow velocity. The effect of hydraulic condition and air pressure on aeration was investigated, and the hollow fiber membrane aeration was compared with aerator. The results show that when air pressure is controlled below bubble point, the oxygenation capacity is increased with increasing liquid circulating flow and air pressure. When air pressure exceeds bubble point, the oxygena- tion capacity is significant in the initial period, but it is decreased with prolonging aeration time. The aeration performance of hollow fiber membrane is better than that of aerator.
出处
《中国给水排水》
CAS
CSCD
北大核心
2011年第13期100-102,共3页
China Water & Wastewater
基金
天津市重点基金资助项目(09JCZDJC26300)
天津市高等学校科技发展基金资助项目(20070714)
关键词
中空纤维疏水膜
无泡曝气
泡点
hydrophobic hollow fiber membrane
bubbleless aeration
bubble point
