Cu^(2+)和Cr^(6+)对活性污泥处理系统的冲击影响研究

Impact of Cu^(2+) and Cr^(6+) upon batch activated sludge systems

以完全混合活性污泥反应器为试验系统,在作为处理对象的实际餐饮废水中添加Cu2+和Cr6+,分批试验发现:添加单一Cu2+的I#系统中,随着Cu2+浓度的增加,污泥浓度及生物相无明显的变化,Cu2+的去除率比较稳定,在90%左右波动;在同时添加Cu2+和Cr6+的Ⅱ#系统中,污泥量明显减少,生物相发生变化,Cr6+浓度达到4.8mg/L,污泥对Cr6+和Cu2+的去除率分别降至27.50%和37.89%。可见,Cr6+对活性污泥系统的毒性远大于Cu2+。

To investigate the endurance of the activated sludge system to Cu 2+ and Cr 6+ in municipal sewage treatment plants, the kitchen-sink wastewater were treated in batch in a complete mixing activated sludge reactor, into which Cu 2+and / or Cr 6+ are added. The results showed that,with the increase of the concentration of Cu 2+ in reactor Ⅰ#, neither the sludge quantity nor the microfauna changed obviously, the removal rate of Cu 2+ was more than 90%; while Cu 2+and Cr 6+ were added synchronously into reactor Ⅱ#, and both the sludge quantity and the microfauna varied obviously, moreover the removal rates of Cu 2+ and Cr 6+ also reduced to about 37.89% and 27.5% respectively. It can be concluded that the toxicity of Cr 6+ to the activated sludge system is far stronger than that of Cu 2+.