p-CNB对好氧污泥活性和污染物降解动力学的影响

Effect of p-Chloronitrobenzene on Aerobic Sludge Activity and Pollutants Biodegradation Kinetics

考察了污水中微量对氯硝基苯(p-CNB)对好氧污泥活性和污染物降解动力学的影响。结果表明,微量p-CNB对好氧污泥转化NO2--N的效果具有明显的抑制作用,而对COD、NH4+-N降解效果的抑制作用相对较小,且对好氧污泥进行驯化后可以减轻这种抑制作用;投加微量p-CNB后,未驯化好氧污泥的脱氢酶活性比对照试验的降低了23%,而驯化后好氧污泥的脱氢酶活性比对照试验的降低了8%;好氧污泥对COD和NH4+-N的降解过程符合Lawrence-McCarty一级反应动力学模型,微量p-CNB对COD和NH4+-N的降解速率有一定的抑制作用。

The effect of p-chloronitrobenzene （p-CNB） on aerobic sludge activity and pollutants biodegradation kinetics was investigated. The results show that trace p-CNB has significant inhibitory effect on the biotransformation of NO2^- - N, while the inhibitory effects on degradation of COD and NH4^＋ - N are relatively small, and the inhibitory effects can be relieved by aerobic sludge domestication. After adding p-CNB, compared with control experiment, the TrC-dehydrogenase activity of raw aerobic sludge is decreased by 23% , while the TTC-dehydrogenase activity of domesticated aerobic sludge is decreased by 8%. The biodegradation of COD and NH4^＋ - N by aerobic sludge is in accordance with Lawrence-McCarty first-order reaction kinetic model. Trace p-CNB has some inhibitory effect on the degradation rates of COD and NH4^＋ - N.