石化污泥混合菌和白腐真菌对气相苯系物的降解能力比较

为寻找合适的菌源在生物滴滤器中挂膜以降解苯系物挥发性有机废气,选用以甲苯为底物驯化的石化污泥和白腐真菌做菌源,研究了2类菌源对苯、甲苯、二甲苯等挥发性有机气体的生物降解规律.比较了石化污泥菌源微生物对苯系物代谢过程在耐受化合物浓度、降解起动期、降解速率以及降解程度等方面的差异.结果表明,石化污泥混合菌对苯的降解效率远高于白腐真菌,混合菌最大降解率为100%,而白腐真菌最高降解率只有46.1%.在石化污泥菌种体系中,对于同种化合物而言,随着化合物初始浓度的增加所需起动期增长,降解率降低;3种化合物的降解难易顺序为:甲苯＞苯＞二甲苯,同种物质的平均降解速率低于起动期后的降解速率.石化污泥菌源更适合降解苯系物废气.

Comparison of biodegradation of benzene hydrocarbons gas with mixed culture from petrifaction sludge and white-rot fungi

The article aims to introduce the authors' study on the biodegradation of benzene, toluene and xylene gas with mixed culture from petrifaction sludge acclimated by toluene and white-rot fungi so as to discover the suitable bacteria for the biodegradation of benzene hydrocarbons in biotrickling filter. The authors have also studied the difference of VOCs concentration, starting-point, degradation rate and the degree for benzene hydrocarbons with mixed culture from the petrifaction sludge. The results show that the degradation capability of benzene with mixed culture is much higher than that with white-rot fungi. As a result, it was found that the maximum removing efficiency could reach 100% with the mixed culture and only 46.1% with the white-rot fungi. The biodegradability of the compounds with mixed culture was just in the order of the following: toluene at the top, with benzene being better and xylene-good. The starting-point of the research is to prolong and decrease the removing efficiency with the increase of original concentration with the same compound. The average degradation rate for the same compound proves to be lower than that after starting-point. In so doing, the mixed culture from petrifaction sludge can be superior to the white-rot fungi for the degradation of benzene hydrocarbons.