生物滴滤器净化低浓度甲苯废气的非稳态工况研究

生物法处理大气污染物时,经常会遇到条件波动或污染物间歇排放等非稳态工况。在不同非稳态条件下,考察了甲苯废气间歇排放对生物滴滤器净化性能的影响。实验方案分3种情况:无甲苯废气排放、无循环液供应或同时没有甲苯废气和循环液的供应。间歇排放时间从2~47 d不等。结果表明,不管何种形式的停运或故障,甲苯净化能力4 d以内基本不下降;停运时间超过5 d,则甲苯去除能力严重下降,仅为原来的1/3~1/2;停运时间在10 d以内,24 h内即可恢复,47 d的长期停运,3 d内也可恢复净化能力。

Investigation of unstable state of purifying waste gas containing toluene in biotrickling filters

Biotrickling filters(BTFs)for air pollution control are expected to encounter fluctuating conditions or periods without pollutant supply.The effect of pollutant starvation on bench-scale BTFs filters treating toluene was investigated.The experimental protocol consisted of starving BTFs under various conditions: without airflow containing toluene;without liquid recycle;without airflow and liquid recycle.The duration of period varied from 2 to 47 days.The results show that no reactor lost its ability to degrade toluene if starvation was less than 4 days,regardless of any mode of starvation.Reactors starved more than 5 days lost their ability critically,but this decrease was not critical for future re-acclimation.The reacclimation of toluene-degrading BTFs after periods of nonuse(within 10 days) was short(24 h)to reestablish full performance,3 days was enough to re-establish full performance for longer starvation(47 days).