Study On Defuorination Effect Of PFOA Mediated By White Rot Fungi

With the rapid development of modern science and technology, more and more refractory organics have been into the environment. And the organics are harmful to human life. For these organics discharged into the environment, it is a serious problem for us to find degradation method. And the method should be economical and environmentally friendly.Since produced, perfluorooctanoic acid(PFOA) has been widely used in a lot of civilian and industrial production, for its high stability and good oleophobicity and hydrophobicity and surface active. As bring convenience to human life, PFOA was also cumulative in the environment and human and animal tissue. And this has potential threat to the ecological environment and human life. The study researched on the degradation of PFOA by the Phanerochaete chrysosporium Burd(PC). The PC is the classic bacteria of the white rot fungi(WRF). In this study, The PC was cultivated in the soil with PFOA. The change tendency of fluoride ion concentration, PFOA concentration and related enzyme activities in the cultural system were focused on. The results were shown as following:(1) The enzyme activity of the system generated in training process was relatively low.As change tendency of the enzymatic activity, the enzymatic activity of Lac was the highest,enzymatic activity of MnP was lower than Lac, while enzymatic activity of LiP was the lowest. It can prove that Lac might play an important role in the culture system. The change tendency of total enzyme activity was phased changes especially more apparent when added glucose in the system. There were respectively a small peak and a large peak at 13-37 days and 45-63 days, and then decreased.(2) Gaseous fluorine ions generated during the degradation process, the amount was relatively low. Fluoride ion concentration in liquid phase changes were phased ups and downs,it increased in first 28 days, decreased in 28-35 days, after that had upward trend. The total fluoride ion change tendency was broadly consistent with fluoride ion change tendency in liquid phase. PFOA degradation product was a fluorine-containing substance could be dissolved in water.(3) PFOA change tendency was first down slightly, then had a slight increase, then followed by a downward trend. This was coincides with fluoride ion change tendency. It can prove that PFOA could be degraded by PC.(4) The change tendency of fluoride concentration was broadly consistent with the change tendency of enzymatic activity, and was basic anastomotic with the change tendency of the PFOA concentration in the training process. Following the test results, added glucose for the system could promote enzyme production of PC, it could promote PFOA degraded by PC added glucose to system. That also could promote PFOA degraded by PC added with Fe2+and Mn2+.