论文部分内容阅读
考察了三株硝基苯降解菌R.mucilaginosa、S.albidoflavus和M.luteus在不同超声条件下其降解性能的变化。实验结果表明：超声功率180 W,频率35 kHz,作用时间1 5 min时,能有效地提高硝基苯降解菌的降解率。在最佳超声条件下,与对照组相比,培养96 h后,三株菌的降解率分别提高了11.3%、7.9%和1.3%。通过连续实验发现超声开始作用的时间分别为15,17,16 h。对于菌株Z1和Z2,超声波持续作用的时间分别为52 h和5 h,对菌株Z3作用不明显,可知低强度超声波并不会对所有菌株的生物降解过程都起到强化作用。三株菌对硝基苯的降解均符合Andrews非竞争性底物抑制模型,且超声组各动力学参数较对照组均有所提高。低强度超声波对三株菌在动力学上的强化效果依次为Z1〉Z2〉Z3。“,”In this paper the low-intensity ultrasound（LIU） group and the control group were employed to investigate the microbial degradation of NB with Rhodotorula mucilaginosa Z1,Streptomgces albidoflavus Z2 and Micrococcus luteus Z3 under different conditions.The operation conditions were optimized as 35 kHz,180 W and 15 min for irradiation.Compared to control group,the NB removals in LIU group were increased by 11.3%,7.9% and 1.3% in 96 h and the initial ultrasound effects were observed at 15 h,17 h and 16 h in continuous experiments,respectively.For Z1 and Z2,the effect duration was 52 h and 5h.No obvious duration on Z3 indicates that LIU can not improve all the microbial degradation of NB.The degradation curves fit the Andrews model well,and the kinetic parameters were improved by ultrasound.The low intensity ultrasound has different effect on the three strains in kinetics.