Study of biological treatment on indoor air polluted by BTX

On the basis of bake-out exhaust, biological treatment is applied to dealing with BTX (benzene, toluene and xylene) exhaust outside of indoor air polltued. Under the condition of gas flux of 600 L/h, circulating flood flux of 20 L/h, pH of 6-7 and temperature of 30°C, BTX is treated with biological method before exhausted outdoor. When the concentration of benzene, toluene and xylene are 2.254-46.733 mg/m³,0.510-28.254 mg/m³ and 4.166-59.008 mg/m3 respectively, the experiments results show that benzene, toluene and xylene purification efficiencies are 49%-73% ,66%-95% and 66%-90%, respectively. The purification efficiencies of BTX in biotrickling filter at temperature of 30°C and 351 are better than that at 40°C .Three optimized bacterias are obtained from the biotrickling filter. They are identified physiologically and biochemically with the aid of sequencing the 16SrDNA and establishing the phylogenic tree. They are Pseudomonas. sp, Bacillus. sp and Artkrobacter. sp, respectively. This study indicates that not only biotrickling filter can solve indoor air pollution by BTX, but also it will not cause second pollution.