中文摘要：

采用悬浮态光催化超滤膜反应器处理偶氮染料直接耐酸大红4BS。系统地研究了溶液pH值、TiO2和4BS浓度对光催化过程以及进水流速、操作时间对PAN700和PVDF700两种超滤膜分离TiO2过程的影响,得出悬浮态光催化超滤膜反应器的最佳操作条件。实验结果表明,pH为5.5时,TiO2对4BS的吸附性最好,吸附过程符合Langmuir等温吸附规律。在UV=100W、T=20℃、染料初始浓度为50mg·L^-1以及催化剂TiO2浓度为1g·L^-1的最佳光催化操作条件下反应60min后,染料4BS去除率可达到97.9%。超滤膜回收TiO2的过程中,随着流速增加,产水通量增加,出水水质维持稳定,且PAN700比PVDF700性能更好,出水浊度低,产水通量更大。PAN700膜在0.12MPa、40L·h^-1的进水流速下连续运行120min后,通量仅衰减28%,为214.00L·m^-2h^-1。通过滤饼模型计算了分离过程的污染常数β值,结果表明PAN700比PVDF700膜更适合用于耦合分离过程。

英文摘要：

The performance of slurry photocatalytic ultrafiltration membrane reactor used for degrading the direct scarlet 4BS in dying wastewater was studied. The influences of operating parameters, such as the pH value, amount of photocatalyst TiO2 used and initial 4BS concentration in the wastewater, on the photocatalysis process, as well as the effects of feed rate and operating time on the ultrafiltration processes using PAN700 and PVDF700 membranes were investigated respectively. In order to analyze the adsorption and photocatalytic process of the 4BS on TiO2 catalyst, the Langmuir model was adopted. Results indicate that a maximal adsorption amount of dye on TiO2 occurs at pH=5.5 and the adsorption character is in accord with the Langmuir model. Under the found optimal operation conditions of UV=100 W, T = 20℃, used TiO2 amount of 1 g·L^-1 and initial 4BS concentration of 50 m g·L^-1,the degradation ratio of 4BS in wastewater after UV irradiation of 60 min can be up to 97.9%. The effects of feed rate and operation time on the performances of ultrafiltration for TiO2 recovery by using two different kinds of membrane, PAN700 and PVDF700, were also studied respectively. The results show that the PAN700 membrane has larger permeate flux and better anti-fouled behavior than those of PVDF700; and according to the filtration cake model, the fouled constant of the separation process β for each membrane was calculated, which shows that the PVDF700 ultrafiltration membrane is more suitable than PVDF700 to be used in the coupling system of photocatalysis and ultrafiltration processes.