共存重金属离子对好氧活性污泥活性影响的实验研究

Experiment on influence of coexistence heavy metal ions on activity of aerobic activated sludge

采用序批式实验研究了铜、锌、镍离子共存条件下,对活性污泥表观产率、生物吸附降解能力、污泥絮凝沉降性能和耗氧速率等方面的影响,并测定了两种重金属离子共存的情况下,不同浓度重金属离子之间的相互作用。实验结果表明:Cu2+和Zn2+、Cu2+和Ni2+、Zn2+和Ni2+3种离子共存总浓度分别为5、5、10 mg/L以内,对污泥表观产率的影响不是很大,系统可以稳定运行。3种离子共存总浓度分别为5、3、3 mg/L以内,对CODCr的去除率没有影响,MLSS都可以稳定的增加,大于这个基点,系统都无法正常的运行;Cu2+和Ni2+共存的情况下对微生物的呼吸有协同抑制的作用。

The sequence batch reactor experiment is used to study the effects of copper,zinc and nickel on the apparent yield,bio-adsorption degradation capacity,flocculation and settling performance,oxygen consumption rate and other aspects at different ion concentrations.And under the situation of two heavy metal ions co-existence and when the dosing concentrations are different,the interaction between the heavy metal ions is tested.The results of the experiment showed that when the situation of two heavy metal ions co-existence,the total concentrations of Cu2+ and Zn2+,Cu2+ and Ni2+,Zn2+and Ni2+ are within 5,5,10 mg/L respectively,it had a little influence on the apparent yield of sludge,the system can run stably;The total concentrations of Cu2+ and Zn2+,Cu2+ and Ni2+,Zn2+ and Ni2+ are within 5,3,3 mg/L respectively,it had no effect on the removal rate of CODCr and MLSS can be increased stably.If the concentrations are larger than these points,the system can not run normally;When Cu2+ and Ni2+ coexist,there will be a synergistic inhibition on microbial respiration.