好氧微生物降解吲哚的影响因素研究

Study on the Effects of Environmental Factors on the Aerobic Biodegradation of Indole

在好氧条件下,以吲哚作为唯一碳源和能源,从处理焦化废水的活性污泥中分离得到一株细菌,编号CX-YD-XH。研究了该菌在好氧条件下对吲哚的降解性能及环境因素对吲哚降解影响。结果表明,菌种CX-YD-XH对吲哚具有较高的降解性能,去除效率可达85%。弱碱条件有利于吲哚的降解;20～35℃范围内均可有效降解吲哚,但温度为35℃时降解较快;振荡速度对最终去除效率没有明显影响,但适当振荡速度(60 r/min)可有效提高降解速率;在适当的菌种浓度和底物浓度水平上,吲哚具有较高的降解效率。

A bacterial strain CX-YD-XH with the ability to utilize indole as the only carbon source and energy under aerobic condition was isolated from activated sludge of a coking wastewater treatment plant. In this paper, the degradation capacity of the strain for indole and the effects of environmental factors on its aerobic biodegradation were mainly studied. The results showed that the strain CX-YD-XH had a high degradation capacity tor indole and the removal efficiency could reach up to 85%. Weak alkali condition would be more suitable for the biodegradation of indole. Indole could be effectively degraded the strain by in the temperature range of 20 to 35 ~C, whereas a much faster degradation rate was observed at 35 ~C. No significant effect of oscillation on the final removal efficiency was observed but optimal oscillation rate （60 r/min） could effectively improve the biodegradation efficiency of indole. A higher biodegradation efficiency of indole by this stain could be obtained under the conditions of the appropriate amount of the strain or the substrate contents.