生物滴滤池去除VOCs工艺参数优化研究

STUDY ON OPTIMIZATION OF TECHNOLOGICAL PARAMETERS WITH REMOVAL OF VOCs BY USING BIOTRICKLING FILTRATION

以甲苯、乙苯、对二甲苯、间二甲苯及邻二甲苯的混合气体作为试样,考察了生物滴滤工艺中,不同填料选择、不同停留时间、不同进气浓度对去除效率的影响。结果表明:1)分别以竹炭、陶粒、火山岩及烧结填料作为填料时,特制烧结填料性能更佳,综合成本等因素,工程应用宜采用烧结填料或陶粒;2)生物滴滤池去除VOCs苯系物的停留时间宜取值25~40 s,去除率能够达到80%以上;3)VOCs苯系物应用生物滴滤工艺进行净化处理,含量在50~300 mg/m3时,能取得较高的去除率,去除率为63%~95%;升高到300~500 mg/m3时,出气苯系物残存量较大,应考虑多级滴滤池串联,或者串联其他工艺;4)生物滴滤池工艺对VOCs苯系物的去除具有可行性,最优工艺参数及填料时,污染物去除率可达90%以上。

In this study,we used mixed gas sample by toluene,phenylethane,paraxylene,m-xylene and o-xylene,to study the influence of removal efficiency by biotrickling filter when filler,residence time or inlet concentration changed. The results showed that： 1） Among bamboo charcoal,ceramsite,volcanics and special sintering filler used as the fillers,the sintering filler had better performance,and the sintered filler or ceramsite had better cost performance; 2） the retention time of VOCs benzene homologues in biotrickling filter should be kept between 25 ~ 40 s,then the removal rate could reach more than 80%;3） when VOCs benzene used biotrickling filter for purification with the concentration between 50 ~ 300 mg/m3,the removal rate could achieve 63% ~ 95%. While the concentration increased to 300 ~ 500 mg/m3,multi-level filters or other process should be considered; 4） the biotrickling filter technology had the advantage on the removal of benzene homologues in VOCs,the removal rate of pollutants could be more than 90%,when the process parameters and filler were properly chosen.