粉煤灰钝化污泥对土中总氮·总磷和重金属含量的影响

目的]研究粉煤灰对土中的总氮、总磷和重金属含量的影响。方法]在土壤中分别添加质量浓度为1%、3%的混有不同比例粉煤灰(2%、5%、10%、15%)的污泥。结果]与对照相比,施用1%和3%污泥增加了土中TN、TP含量,其增幅分别为6.74%～30.29%和3.81%～32.67%,粉煤灰的加入量对其增幅无明显的影响;污泥施用增加了土中Cu、Zn、Pb、Ni和Cr的含量,投加粉煤灰在污泥低用量(10 g/kg)时未表现出明显的重金属钝化作用,而在高用量(30 g/kg)时表现出对Ni和Pb的钝化。结论]施用污泥可增加土中TN、TP含量,但粉煤灰对其无明显影响;污泥施用增加了土中重金属的含量,投加粉煤灰在污泥高用量时表现出对Ni和Pb的钝化。

Effect of Sewage Sludge Stabilized by Fly Ash on TN,TP and Heavy Metals in Soil

Objective] The research aimed to investigate the effects of sewage sludge stabilized by fly ash on TN,TP and heavy metals in soil.Method]1% and 3% sewage sludge stabilized by fly ash was added to the soil.Result] Sewage sludge increased the amount of TN and TP in soil with the extent of 6.74%~30.29% and 3.81% ~ 32.67% respectively,while fly ash had no obvious effect on it.Sewage sludge increased the amount of Cu,Zn,Pb,Ni and Cr in soil.The passivation of fly ash to Ni and Pb was obvious in the treatment of 3% sewage sludge,while fly ash was no obvious effect on heavy metals in the treatment of 1% sewage sludge.Conclusion] Sewage sludge increased the amount of TN and TP in soil,respectively while fly ash had no obvious effect.Sewage sludge increased the amount of heavy metals in soil,and the passivation of fly ash to Ni and Pb was obvious in the treatment of 3% sewage sludge.