Research On Toluene-Contained Waste Air Treatment By Biotrickling Filter

Biotrickling filter can remove toluene from air effectively. In this paper ,the optimal conditions of biotrickling filter were discussed and optimized by changing some factors such as nutrition, pH and residence time, related with the problems which may be faced in application of industry ,such as the quantity of circular liquid, the time of activity resumption affter 'starvation'. This research demonstrated that the proformance of reactor was optimal under the conditon that the quantity of circular liquid at 1.5-2.5L/h, pH at 6-6.5, the rate of C/N below 17.5. However, in some other researches, the quantity of circular liquid was usually above 8L/h, it would increase the cost greatly in application of industry. The elimination capacity of the upper reactor was higher than the lower when the residence time was 60s.While with the reduction of residence time ,the trend woule be altered, if the residence time was shortened than 40s, the elimination capacity of the lower reactor was higher than the upper one. Nutrition and condition of bioreactor can be reflected by Microbial activity, here we studied the factors which would influence Microbial activity by analyzed the OUR of biofilm. When biomass was excessive, Microbial activity was lower than usual. Accumulation of biomass and raise of pressure drop were key factors which effected the life of filter bed. We explored the appropriate measure by analyzed the mode of biomass accumulation and pressure drop change. The rate of biomass accumulation was equably and disciplinarily while the raising of pressure drop was accelerated. In this research, we also isolated and identified two strains of toluene-degraded bacterium in order to analyze the characteristics of biofilm.