Study on Vacuum Membrane Distillation of PP Hollow Fiber Membranes Used in Concentrated Seawater from Low-Pressure Reverse Osmosis
- 作者：Feifei ShaoLei NiYufeng ZhangYingbo chenZhen LiuZhen Cao
- 会议时间：2012-06-26
- 关键词：membrane distillation ; polypropylene ; hollow fiber ; distillation.
- 作者单位：State Key Laboratory of Hollow Fiber Membrane Materials and Processes (Tianjin Polytechnic University), Tianjin, 300387, China
- 母体文献：2012青岛国际脱盐大会论文集
- 会议名称：2012青岛国际脱盐大会
- 会议地点：青岛
- 主办单位：中国金属学会
- 语种：chi
- 分类号：O6;TV9
摘要
Concentrated seawater from low-pressure reverse osmosis (RO) was treated by membrane distillation technology (MD) . Hydrophobic PP hollow fiber was fabricated by the melt-spinning method. The microstructure of the PP hollow fiber membrane was observed. The effects of NaCl concentration, flow rate and temperature on water flux and rejection rate were studied. The results showed that water flux and salt rejection rate changed a little with increasing initial concentration of NaCl solution. Water flux increased greatly with the increase of feed temperature, vacuum pressure and solution flow rate. The SEM result indicated that the slit-like micropore size well formed with the maximal pore size 0.05μm wide while 0.3um long. In this work, the maximal water flux reached 7.8 L/m2h, and the rejection ratio of NaCl was above 99.9%.