Song Lili, Zhu Bo, Gray Stephen, Duke Mikel, Muthukumaran Shobha
Institute for Sustainability and Innovation, College of Engineering and Science, Victoria University, P.O. Box 14428, Melbourne, VIC 8001, Australia.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China.
Membranes (Basel). 2016 Mar 1;6(1):18. doi: 10.3390/membranes6010018.
This study explored the combined effects of photocatalysis with ceramic membrane filtration for the removal of humic acid in the presence of salt; to simulate saline wastewater conditions. The effects of operating parameters, such as salinity and TiO₂ concentration on permeate fluxes, total organic carbon (TOC), and UV absorbance removal, were investigated. The interaction between the humic acids and TiO₂ photocatalyst played an important role in the observed flux change during ceramic membrane filtration. The results for this hybrid system showed that the TOC removal was more than 70% for both without NaCl and with the 500 ppm NaCl concentration, and 62% and 66% for 1000 and 2000 ppm NaCl concentrations. The reduction in UV absorbance was more complete in the absence of NaCl compared to the presence of NaCl. The operation of the integrated photoreactor-ceramic membrane filter over five repeat cycles is described. It can be concluded that the overall removal performance of the hybrid system was influenced by the presence of salts, as salt leads to agglomeration of TiO₂ particles by suppressing the stabilising effects of electrostatic repulsion and thereby reduces the effective surface contact between the pollutant and the photocatalyst.
本研究探讨了在有盐存在的情况下光催化与陶瓷膜过滤相结合对腐殖酸的去除效果，以模拟含盐废水条件。研究了盐度和TiO₂浓度等操作参数对渗透通量、总有机碳（TOC）和紫外吸光度去除率的影响。腐殖酸与TiO₂光催化剂之间的相互作用在陶瓷膜过滤过程中观察到的通量变化中起重要作用。该混合系统的结果表明，在无NaCl和NaCl浓度为500 ppm时，TOC去除率均超过70%，在NaCl浓度为1000 ppm和2000 ppm时，TOC去除率分别为62%和66%。与有NaCl存在相比，无NaCl时紫外吸光度的降低更彻底。描述了集成光反应器 - 陶瓷膜过滤器在五个重复循环中的运行情况。可以得出结论，混合系统的整体去除性能受盐的存在影响，因为盐通过抑制静电排斥的稳定作用导致TiO₂颗粒团聚，从而减少污染物与光催化剂之间的有效表面接触。
