生物滴滤塔中两种优势菌种对高浓度甲苯废气净化对比实验

以陶粒为填料,用分别负载2种单一降解甲苯的优势菌种S1、S2的生物滴滤塔净化高浓度甲苯废气的性能进行对比实验研究,实验结果表明:虽然2种优势菌种同为芽孢杆菌,但是菌种S1在降解能力以及停用后恢复等各项指标中均明显高于菌种S2。当甲苯进口浓度低于5.81 mg/L时,S1菌种的去除率始终保持在90%以上,最高的进口浓度达到10.00 mg/L时,甲苯的去除率也可以达到59.78%。对于S2菌种而言,当最高进口浓度达到5.72 mg/L,甲苯的降解率仅可以达到65.65%。两个滴滤塔在停用后恢复运行时,菌种S1可以在极短的时间内恢复,菌种S2则是规律性的在恢复初期出现降解率最低点,且甲苯降解效率只能恢复到70%~80%。

COMPARATIVE EXPERIMENTS ON BIODEGRADATION OF HIGH CONCENTRATION TOLUENE BY TWO DOMINANT BACTERIA IN BIOTRICKLING FILTERS

The biodegradation performance of high concentration toluene was comparatively investigated by two biotrickling filters(BTFs) which packed with ceramic pellets and two different dominant bacteria S1,S2.Though the two bacteria are all belong to Bacillus sp.,the experimental results including removal efficiency,non-use BTFs without airflow and liquid recycle indicated that they had obvious differences.S1 could always achieve 90% removal efficiency when the inlet toluene gas concentration was below 5.81 mg/L,and the maximum inlet toluene concentration could reach 10.00 mg/L related with 59.78% removal efficiency.While S2 only bore the maximum inlet toluene concentration(5.72 mg/L) with 65.65% removal efficiency.The results of non-use BTFs experiments proved that after 10 days,S1 needed only 16 hours to revive 100% removal efficiency,while S2 merely regained 70%～80% removal efficiency.