Abstract:

A membrane contact ozone (O₃) bubble-free mass transfer technology was developed by assembling hydrophobic polytetrafluoroethylene (PTFE) hollow fiber membrane into membrane contactor. When the stirring speed reached 1000r/min, the mass transfer of membrane mass transfer (apparent mass transfer coefficient K_La=0.0807min^-1) was equivalent to that of bubble mass transfer (K_La=0.0791min^-1). The single factor experiment and L₁₆(4⁴) orthogonal experiment were carried out to study the effects of inlet flow rate, inlet O₃ concentration, pH and phenol concentration on O₃ mass transfer in hollow fiber membrane contact reactor. Range analysis, variance analysis, comprehensive balance analysis and weight matrix analysis were used for data processing, and the optimal mass transfer conditions of membrane contact O₃ bubble-free mass transfer technology were determined. The results showed that the four experimental factors had a significant effect on the mass transfer effect of O₃ without bubbles. The optimized mass transfer conditions were as follows: inlet flow rate 100mL/min, inlet O₃ concentration 100mg/L, initial pH was 10 and pollutant concentration 30mg/L. Under the optimized conditions, the O₃ mass transfer flux was maintained above 170mg/(m²∙min), and the O₃ absorption rate reached more than 80%.

Key words: ozone, membrane contact reactor, no bubble mass transfer, orthogonal experiment, comprehensive balance analysis, weight matrix analysis

摘要：

将疏水性聚四氟乙烯（PTFE）中空纤维膜组装成膜接触式反应器，开发了膜接触式臭氧（O₃）无气泡传质技术。当搅拌速度达到1000r/min时，膜传质的传质情况（表观传质系数K_La=0.0807min^-1）与气泡传质（K_La=0.0791min^-1）相当。进行了单因素实验及L₁₆(4⁴)正交实验，研究了进气流量、O₃进气浓度、pH、苯酚浓度等对中空纤维膜接触式反应器O₃传质情况的影响；采用极差分析、方差分析、综合平衡分析及权矩阵分析进行数据处理，优化膜接触式O₃无气泡传质技术的传质条件。结果表明，四种实验因素均对O₃无气泡传质效果产生了显著性的影响；优化后的传质条件为：进气流量100mL/min，O₃进气浓度100mg/L、初始pH为10、污染物浓度30mg/L。优化条件下三次重复实验O₃传质通量均保持在170mg/(m²·min)以上，O₃吸收率均达到了80%以上。

关键词: 臭氧, 膜接触式反应器, 无气泡传质, 正交实验, 综合平衡分析, 权矩阵分析