摘要
通过检测活性污泥系统的电子传递活性以及COD的去除速率,研究了Cr6+对污泥活性以及有机物降解速率的影响,并探讨了两者之间的关系。研究结果表明:5mg·L-1的Cr6+即会对系统产生明显影响,Cr6+对污泥活性和COD去除率的抑制作用随其质量浓度的增大而增强;当Cr6+质量浓度达到25mg·L-1时,污泥的INT和TTC-电子传递(TTC-ETS)活性以及有机物降解速率都表现为大幅的下降,下降比例分别为46.98%、54.18%以及64.47%。Cr6+抑制污泥TTC-ETS活性的IC50小于抑制INT-ETS活性的IC50,表明TTC-ETS活性反映Cr6+毒性作用的灵敏性大于INT-ETS活性。此外,INT和TTC-ETS活性与有机物降解速率之间也均存在显著的正相关性,说明两者都是表征Cr6+对有机物去除速率影响的灵敏参数。
The impacts of Cr^6＋ on the activity and organic matter degradation rate of activited sludge, as well as relationship between them were studied by the determination of electron transport system（ ETS ） activity and COD removal rate. The results indicated that significant effects would occur when the dosage of Cr^6＋is 5 mg/L. And the negative effects of Cr^6＋on the activity and COD removal rate increased with the increase of Cr^6＋concentration. In case of the Cr^6＋concentration of 25 mg/L, the decreasing ratio of INT andTTC-ETS activity and the COD removal rate were 46.98%, 54.18%, and 64.47% respectively. The median inhibitory concentration （IC50） of Cr^6＋ measured via TTC-electron transport system（TTC-ETS） activity was less than that of INT-electron transport system （INT-ETS） activity, indicating that the activity of 1NT-ETS to Cr^6＋ was less sensitive than that of TTC-ETS activity. Addtionally, significant positive correlations could be found between the organic matter degradation rate and the INT-ETS activity, as well as the TTC-ETS activity, in activated sludge system. Thus, the INT and the TTC-ETS activity were both effective parameters for characterizing the activity of activated sludge affected by Cr^6＋.
出处
《生态环境学报》
CSCD
北大核心
2009年第6期2113-2117,共5页
Ecology and Environmental Sciences
基金
中国博士后科学基金项目(20080431214)
山东农业大学青年创新基金项目
