生物滴滤法处理喷漆废气

采用生物滴滤系统处理喷漆废气,在研究了混合气体中甲苯与二甲苯之间相互作用的基础上,对生物滴滤系统净化喷漆废气的稳定性进行了研究。实验结果表明:在挂膜启动阶段,进气流量为22.5 m3/h、空塔停留时间为33.9 s、进气甲苯质量浓度为400~1 500 mg/m3的条件下,最终甲苯去除率可稳定在97%以上;在总进气质量浓度为1 000 mg/m3的条件下处理甲苯和二甲苯混合气体,混合气体中甲苯与二甲苯存在相互抑制作用,且甲苯对二甲苯的抑制作用更强;在进气流量为20.0 m3/h、空塔停留时间为38.0 s、进气中总挥发性有机物(TVOCs)质量浓度为300~900 mg/m3的条件下处理喷漆废气,平均TVOCs去除率为90.84%,出口二甲苯质量浓度低于GB16297—1996《大气污染物综合排放标准》中规定的排放限值(二甲苯质量浓度为70 mg/m3),基本满足排放要求。

Treatment of Spray Paint Waste Gas by Biotrickling Filtration

The spray paint waste gas was treated by a biotrickling filtration （BTF） system. On the basis of study on the interaction between toluene and xylene in mixed gas,the stability of BTF system in treatment of spray paint waste gas was investigated. The experimental results show that：Under the start-up conditions of inlet flow 22.5 m³/h,EBRT 33.9 s and inlet toluene mass concentration 400-1 500 mg/m³,the removal rate of toluene is stable at above 97%;When the toluene-xylene mixed gas with 1 000 mg/m³ of total inlet mass concentration is treated,the inhibition effects of toluene and xylene on each other are appeared and that of toluene is stronger;When the spray paint waste gas is treated under the conditions of inlet flow 20.0 m³/h,EBRT 38.0 s and TVOCs mass concentration 300-900 mg/m³,the average TVOCs removal rate is 90.84%,and the outlet xylene mass concentration is lower than the emission limits in national air pollutant emission standards of GB 16297-1996.