固化污泥中Cu、Zn形态的转化及对浸出毒性的影响

Cu,Zn form Transform and Effect on Leaching Toxicity in Solidification Sludge

污泥经过固化处理后,能稳定其中的重金属,降低其浸出毒性,减少对环境的二次污染。但固化污泥中重金属的潜在毒性与其形态有着紧密的联系,仅仅通过浸出毒性指标不能全面反映固化污泥中重金属的潜在污染。通过Tessier五步浸提法分析污泥固化前后、不同固化材料掺入量对重金属形态的影响,并对其形态与浸出毒性进行对比分析。研究结果表明,污泥固化后Cu、Zn的有机结合态变化最大,一般情况下Cu、Zn的浸出毒性指标均不能全面反映其潜在毒性。

After solidifying treatment of sludge, which can stabilize the heavy metals, decreased the leaching toxicity and reduced the secondary pollution to the environment. However, the leaching toxicity used to indicate the potential toxicity in solidified sludge is not veracious. Therefore we use of Tessier five - step extraction analysis of the sludge before and after solidifying, different materials impact of heavy metals patterns and leaching toxicity. The results showed that after solidifying Cu, Zn - state changes the largest in the organic -bound and Cu, Zn leaching toxicity can not be represented by its potential toxicity.