Immobilized Mechnism Of Microorganism On The CF And The Applization In Sewage Treatment

By means of the measurement of the content of surface element, surface functional groups,degree of moisture, specific area, surface electrode, the effect of carrier's surface characteristics onimmobilization and activity of different bacterium is investigated systemic in this paper. There arethree aspects in the paper, which are immobilization of facultative denitrifying aerobes on thedifferent carriers, immobilization of anaerobe on the different carriers, and rule about effect ofcarrier's surface characteristics, especially in carbon fiber (CF), on the immobilization of differentmicroorganism such as aerobes, facultative anaerobes and anaerobes. The first part of the paper shows that the immobilized speed in facultative denitrifying aerobesis rapider on the surface of modified polyacrylonitrile (PAN)-based high strength CF and activatedcarbon fiber (ACF) than on that of other carriers because of good biocompatibility of carbon. Andthe immobilized speed on the surface of ACF, which has higher specific surface area and moremicroholes, is quicker than that on the surface of high strength CF. By the titration and XPS analysis,nitrogen element content on the surface of CF is important for immobilization of microorganismwhen element content of carbon and oxygen is close. More element content of nitrogen and oxygenleads to bigger surface moisture, and proper surface moisture is beneficial to immobilization offacultative anaerobes. Proper content of oxygenic and nitrogen functional groups makes immobilizedbiomass achieve the most, and oxygenic functional groups with high polar has important impact onimmobilization of microorganism. The study about dynamics of denitrifying microorganism suggeststhat the denitrifying speed is zero-order reaction with concentration of NO3-N. Denitrifying speedcan still be kept high level in lower temperature and less carbon source when modified PAN-basedhigh strength CF is used as the biofilm carrier as compared with plastics carriers. According to the second part of the thesis, the hydrophobic surface about CF is beneficial toimmobilization of anaerobes, and immobilized speed on the surface of CF is quicker than that oforgan carriers. The third part of the paper surggests the effect of specific surface areas on immobilized speed ofmicroorganism is obvious and immobilized speed on the CF is rapider. Aerobes, facultativeanaerobes and anaerobes would the demand of surface moisture, corresponding nitrogen and oxygen 2硕士学位论文 炭纤维的微生物固着机制及在污水处理中的应用研究content would reduce in turn because they are closely relative to moisture of carriers. In sum, as a kind of soft fiber carriers, modified PAN-based high strength CF is a kind ofhigh quality's carrier with good biocompatibility, highly immobilized speed and biomass, andresisting chemical erosion, decomposition of microorganism and strong hydraulic impaction forbiofilm.