光催化与生物膜直接耦合降解4-氟苯酚废水

为了实现4-氟苯酚(4-FP)废水的快速持续降解,本文构建了光催化与生物膜直接耦合系统.该耦合系统由N掺杂TiO2涂覆光催化光纤束、生物膜、核孔膜和紫外-可见LED光源构成.实验研究了单独光催化、单独微藻生物膜及光催化-生物膜耦合3种体系对4-FP的降解性能.研究发现:光催化系统降解4-FP速率慢、脱氟效率低,12h内...

The degradation of 4-fluorophenol wastewater by intimately coupling photocatalysis and biofilm syestem

In this study, a novel intimately coupling photocatalysis and biodegradation (ICPB) system composed of N-doped TiO₂- coated photocatalytic optical fibers, biofilm, nuclear pore membrane and UV-Visible LED light source was successfully demonstrated for rapid and continuous degradation of 4-fluorophenol (4-FP). We investigated the performance of isolated photocatalysis, separated microalgae biofilm and ICPB systems for the degradation of 4-FP. The results highlighted that the isolated photocatalytic system exposed low degradation (94.3% removal of 4-FP) and defluorination (24.7% defluorinated) in 12h. The isolated microalgae system exhibited better degradation performance than those of the photocatalysis in the first cycle, the removal of 4-FP and defluorinated reached to 98.9% and 90.9% in 10h; however, they decreased to 75.5% and 69.5% after three cycles, respectively. In the ICPB system, the biofilm, which enriched Rhodococcus, Pseudomonas and Achromobacter, led to synergism among photocatalysis, biodegradation and photosynthesis. This synergism provided rapid and continuous degradation of 4-FP, exhibited 100% removal of 4-FP after cycle 12, in 5h, accompanied with 89.4% removal of dissolved organic carbon and 78.3% defluorination.