生物过滤床处理甲苯和乙酸乙酯混合废气

引　言利用生物过滤床处理臭味气体、有害空气污染物 (ＨＡＰｓ)和挥发性有机物 (ＶＯＣｓ) ,已成为大气质量控制的研究热点1～ 4 ] 与传统的大气控制方法相比 ,生物过滤床具有操作简单、运行成本低、无二次污染等特点5] .目前的生物过滤床主要用于去除低浓度的恶臭气体和ＶＯＣｓ .当气体中的污染物浓度较高或是含多种污染物时 ,往往会使生物过滤床的操作效率降低6～ 9] .乙酸乙酯 (ＥＡ )和甲苯 (ＴＬ)是常见的两种ＶＯＣｓ,并且这两种污染物同时存在于彩印厂尾气中 ,目前我国对这两种废气一般采用高空排放法 ,污染物未得到治理 .本实…

SIMULTANEOUS BIOFILTRATION OF ETHYL ACETATE AND TOLUENE IN EMISSION GAS

Two biofilters,RA which had been exposed to varying concentration of ethyl acet ate for 20 days and RB which had been exposed to varying concentration of toluen e for 20 days, were used to remove mixed gas of ethyl acetate and toluene. The t wo biofilters used a mixture of compost and lava, with the initial medium moisture content of 50%. The experimental results demonstrated several characteristics of the two biofilters:The maximum elimination capacities were about 400g·m ^-3 ·h ^-1 for ethyl acetate and 50 g·m ^-3 ·h ^-1 for toluene;U nder the condition that the empty bed residence time was 1.0 minute, for e thyl a cetate concentration in the inlet air ranging from 2000 mg·m ^-3 to 4500m g·m ^-3 and toluene concentration ranging from 200mg·m ^-3 to 400m g·m ^-3 ,the removal efficiency for binary VOCs of both biofilter RA was ab ove 90%;Biofilter RA was better than biofilter RB in elimination capacity, stabi lity and adaptability.