碳纤维表面特性对兼性及厌氧微生物固着的影响

Effect of surface characteristics of carbon fiber on immobilization of facultative and anaerobic aerobes

聚丙烯腈(PAN)基碳纤维表面含氧官能团的种类和数量对固着在碳纤维表面的兼性反硝化菌平均生物膜的厚度有显著的作用,含氧官能团的数量过多或过少都影响碳纤维表面反硝化菌的固着.通过对碳纤维的处理获得适量的表面含氧官能团和平衡含水率,可有效地改善碳纤维表面兼性反硝化菌的固着化行为,有助于使碳纤维表面的反硝化生物膜附着量达到最大值.处于同一水平平衡含水率的碳纤维比有机高分子载体对厌氧甲烷菌的固着能力强;同时,随着表面N、O元素含量的增加,平衡含水率增高,碳纤维载体对厌氧甲烷菌的固着能力减弱.高温空气氧化的PAN基高强度碳纤维是一种生物相容性好、固着化程度高、再生能力强、耐微生物分解和化学腐蚀的优异反硝化菌新型固着化载体,而未经表面处理的PAN基高强度碳纤维则是厌氧甲烷菌优异的固着化载体.

Different oxygenic functional groups and their content on the surface of carbon fiber (CF) influence distinctly average thickness of immobilized biofilm. Proper content of surface oxygenic functional groups and proper moisture obtained by modifying the surface of polyacrylonitrile (PAN)-CF, are beneficial to immobinization of denitrifying microorganism. Anaerobic methane bacteria can immobilize the surface of CF easier compared to the surface of plastics with similar moisture. And with the increase of nitrogen and oxygen on the surface of CF, its moisture increases and immobilized ability for methane bacteria weakens. The experiment shows that PAN-based high strength CF modified by high temperature air is a kind of high quality carrier with good biocompatibility, highly immobilized ability and resisting chemical erosion, decomposition of microorganism and strong hydraulic impaction for denitrifying biofilm. However, PAN-based high strength CF, which has not be treated, is a high quality carrier for anaerobic methane bacteria.